refactor(ui): integrate centralized layout and display logic

Update UI components and view layout to use the new centralized layout and
display logic.

- Update `CategoryPanel` to remove redundant title text.
- Update `ViewPanel` to remove redundant title text.
- Refactor `Effect` implementations to use `display_value` and `Rc` for
  records.
- Update `GridWidget` to use the centralized `layout` and `display_text` .
- Refactor `GridLayout` to support synthetic keys for records mode and
  unified display.
- Update `view` module to re-export `synthetic_record_info` .

Co-Authored-By: fiddlerwoaroof/git-smart-commit (unsloth/gemma-4-26B-A4B-it-GGUF:UD-Q5_K_XL)

src/command/cmd.rs

@@ -12,6 +12,7 @@ use crate::view::{Axis, AxisEntry, GridLayout};
 /// Read-only context available to commands for decision-making.
 pub struct CmdContext<'a> {
     pub model: &'a Model,
+    pub layout: &'a GridLayout,
     pub mode: &'a AppMode,
     pub selected: (usize, usize),
     pub row_offset: usize,
@@ -31,24 +32,12 @@ pub struct CmdContext<'a> {
     pub tile_cat_idx: usize,
     /// Named text buffers
     pub buffers: &'a HashMap<String, String>,
-    /// Pre-resolved cell key at the cursor position (None if out of bounds)
-    pub cell_key: Option<crate::model::cell::CellKey>,
-    /// Grid dimensions (so commands don't need GridLayout)
-    pub row_count: usize,
-    pub col_count: usize,
-    /// Categories on Axis::None — aggregated away in the current view
-    pub none_cats: Vec<String>,
     /// View navigation stacks (for drill back/forward)
-    pub view_back_stack: Vec<String>,
+    pub view_back_stack: &'a [String],
-    pub view_forward_stack: Vec<String>,
+    pub view_forward_stack: &'a [String],
-    /// Records-mode info (drill view). None for normal pivot views.
+    /// Display value at the cursor — works uniformly for pivot and records mode.
-    /// When Some, edits stage to drill_state.pending_edits.
+    pub display_value: String,
-    pub records_col: Option<String>,
-    /// The display value at the cursor in records mode (including any
-    /// pending edit override). None for normal pivot views.
-    pub records_value: Option<String>,
     /// How many data rows/cols fit on screen (for viewport scrolling).
-    /// Defaults to generous fallbacks when unknown.
     pub visible_rows: usize,
     pub visible_cols: usize,
     /// Expanded categories in the tree panel
@@ -57,6 +46,21 @@ pub struct CmdContext<'a> {
     pub key_code: KeyCode,
 }
 
+impl<'a> CmdContext<'a> {
+    pub fn cell_key(&self) -> Option<CellKey> {
+        self.layout.cell_key(self.selected.0, self.selected.1)
+    }
+    pub fn row_count(&self) -> usize {
+        self.layout.row_count()
+    }
+    pub fn col_count(&self) -> usize {
+        self.layout.col_count()
+    }
+    pub fn none_cats(&self) -> &[String] {
+        &self.layout.none_cats
+    }
+}
+
 impl<'a> CmdContext<'a> {
     /// Resolve the category panel tree entry at the current cursor.
     pub fn cat_tree_entry(&self) -> Option<crate::ui::cat_tree::CatTreeEntry> {
@@ -251,8 +255,8 @@ impl CursorState {
         Self {
             row: ctx.selected.0,
             col: ctx.selected.1,
-            row_count: ctx.row_count,
+            row_count: ctx.row_count(),
-            col_count: ctx.col_count,
+            col_count: ctx.col_count(),
             row_offset: ctx.row_offset,
             col_offset: ctx.col_offset,
             visible_rows: ctx.visible_rows,
@@ -317,75 +321,32 @@ impl Cmd for MoveSelection {
     }
 }
 
+/// Unified jump-to-edge: jump to first/last row or column.
+/// `is_row` selects the axis; `end` selects first (false) or last (true).
 #[derive(Debug)]
-pub struct JumpToFirstRow {
+pub struct JumpToEdge {
-    pub col: usize,
+    pub cursor: CursorState,
+    pub is_row: bool,
+    pub end: bool,
+    pub cmd_name: &'static str,
 }
-impl Cmd for JumpToFirstRow {
+impl Cmd for JumpToEdge {
     fn name(&self) -> &'static str {
-        "jump-first-row"
+        self.cmd_name
     }
     fn execute(&self, _ctx: &CmdContext) -> Vec<Box<dyn Effect>> {
-        vec![
+        let (nr, nc) = if self.is_row {
-            Box::new(effect::SetSelected(0, self.col)),
+            let r = if self.end { self.cursor.row_count.saturating_sub(1) } else { 0 };
-            Box::new(effect::SetRowOffset(0)),
+            (r, self.cursor.col)
-        ]
+        } else {
-    }
+            let c = if self.end { self.cursor.col_count.saturating_sub(1) } else { 0 };
-}
+            (self.cursor.row, c)
-
+        };
-#[derive(Debug)]
+        viewport_effects(
-pub struct JumpToLastRow {
+            nr, nc,
-    pub col: usize,
+            self.cursor.row_offset, self.cursor.col_offset,
-    pub row_count: usize,
+            self.cursor.visible_rows, self.cursor.visible_cols,
-    pub row_offset: usize,
+        )
-}
-impl Cmd for JumpToLastRow {
-    fn name(&self) -> &'static str {
-        "jump-last-row"
-    }
-    fn execute(&self, _ctx: &CmdContext) -> Vec<Box<dyn Effect>> {
-        let last = self.row_count.saturating_sub(1);
-        let mut effects: Vec<Box<dyn Effect>> = vec![Box::new(effect::SetSelected(last, self.col))];
-        if last >= self.row_offset + 20 {
-            effects.push(Box::new(effect::SetRowOffset(last.saturating_sub(19))));
-        }
-        effects
-    }
-}
-
-#[derive(Debug)]
-pub struct JumpToFirstCol {
-    pub row: usize,
-}
-impl Cmd for JumpToFirstCol {
-    fn name(&self) -> &'static str {
-        "jump-first-col"
-    }
-    fn execute(&self, _ctx: &CmdContext) -> Vec<Box<dyn Effect>> {
-        vec![
-            Box::new(effect::SetSelected(self.row, 0)),
-            Box::new(effect::SetColOffset(0)),
-        ]
-    }
-}
-
-#[derive(Debug)]
-pub struct JumpToLastCol {
-    pub row: usize,
-    pub col_count: usize,
-    pub col_offset: usize,
-}
-impl Cmd for JumpToLastCol {
-    fn name(&self) -> &'static str {
-        "jump-last-col"
-    }
-    fn execute(&self, _ctx: &CmdContext) -> Vec<Box<dyn Effect>> {
-        let last = self.col_count.saturating_sub(1);
-        let mut effects: Vec<Box<dyn Effect>> = vec![Box::new(effect::SetSelected(self.row, last))];
-        if last >= self.col_offset + 8 {
-            effects.push(Box::new(effect::SetColOffset(last.saturating_sub(7))));
-        }
-        effects
     }
 }
 
@@ -401,19 +362,38 @@ impl Cmd for ScrollRows {
     fn execute(&self, _ctx: &CmdContext) -> Vec<Box<dyn Effect>> {
         let row_max = self.cursor.row_count.saturating_sub(1) as i32;
         let nr = (self.cursor.row as i32 + self.delta).clamp(0, row_max) as usize;
-        let mut effects: Vec<Box<dyn Effect>> =
+        viewport_effects(
-            vec![Box::new(effect::SetSelected(nr, self.cursor.col))];
+            nr,
-        let mut row_offset = self.cursor.row_offset;
+            self.cursor.col,
-        if nr < row_offset {
+            self.cursor.row_offset,
-            row_offset = nr;
+            self.cursor.col_offset,
-        }
+            self.cursor.visible_rows,
-        if nr >= row_offset + 20 {
+            self.cursor.visible_cols,
-            row_offset = nr.saturating_sub(19);
+        )
-        }
+    }
-        if row_offset != self.cursor.row_offset {
+}
-            effects.push(Box::new(effect::SetRowOffset(row_offset)));
+
-        }
+#[derive(Debug)]
-        effects
+pub struct PageScroll {
+    pub direction: i32, // 1 for down, -1 for up
+    pub cursor: CursorState,
+}
+impl Cmd for PageScroll {
+    fn name(&self) -> &'static str {
+        "page-scroll"
+    }
+    fn execute(&self, _ctx: &CmdContext) -> Vec<Box<dyn Effect>> {
+        let delta = (self.cursor.visible_rows as i32 * 3 / 4).max(1) * self.direction;
+        let row_max = self.cursor.row_count.saturating_sub(1) as i32;
+        let nr = (self.cursor.row as i32 + delta).clamp(0, row_max) as usize;
+        viewport_effects(
+            nr,
+            self.cursor.col,
+            self.cursor.row_offset,
+            self.cursor.col_offset,
+            self.cursor.visible_rows,
+            self.cursor.visible_cols,
+        )
     }
 }
 
@@ -471,7 +451,7 @@ impl Cmd for SaveAndQuit {
 
 // ── Cell operations ──────────────────────────────────────────────────────────
 // All cell commands take an explicit CellKey. The interactive spec fills it
-// from ctx.cell_key; the parser fills it from Cat/Item coordinate args.
+// from ctx.cell_key(); the parser fills it from Cat/Item coordinate args.
 
 /// Clear a cell.
 #[derive(Debug)]
@@ -500,8 +480,7 @@ impl Cmd for YankCell {
         "yank"
     }
     fn execute(&self, ctx: &CmdContext) -> Vec<Box<dyn Effect>> {
-        let layout = GridLayout::new(ctx.model, ctx.model.active_view());
+        let value = ctx.model.evaluate_aggregated(&self.key, ctx.none_cats());
-        let value = ctx.model.evaluate_aggregated(&self.key, &layout.none_cats);
         vec![
             Box::new(effect::SetYanked(value)),
             effect::set_status("Yanked"),
@@ -590,12 +569,7 @@ impl Cmd for TogglePanelAndFocus {
             open: self.open,
         }));
         if self.focused {
-            let mode = match self.panel {
+            effects.push(effect::change_mode(self.panel.mode()));
-                Panel::Formula => AppMode::FormulaPanel,
-                Panel::Category => AppMode::CategoryPanel,
-                Panel::View => AppMode::ViewPanel,
-            };
-            effects.push(effect::change_mode(mode));
         } else {
             effects.push(effect::change_mode(AppMode::Normal));
         }
@@ -682,33 +656,29 @@ impl Cmd for EditOrDrill {
         // Only consider regular (non-virtual, non-label) categories on None
         // as true aggregation. Virtuals like _Index/_Dim are always None in
         // pivot mode and don't imply aggregation.
-        let regular_none = ctx.none_cats.iter().any(|c| {
+        let regular_none = ctx.none_cats().iter().any(|c| {
             ctx.model
                 .category(c)
                 .map(|cat| cat.kind.is_regular())
                 .unwrap_or(false)
         });
-        let is_aggregated = ctx.records_col.is_none() && regular_none;
+        // In records mode (synthetic key), always edit directly — no drilling.
+        let is_synthetic = ctx
+            .cell_key()
+            .as_ref()
+            .and_then(|k| crate::view::synthetic_record_info(k))
+            .is_some();
+        let is_aggregated = !is_synthetic && regular_none;
         if is_aggregated {
-            let Some(key) = ctx.cell_key.clone() else {
+            let Some(key) = ctx.cell_key().clone() else {
-                return vec![effect::set_status(
+                return vec![effect::set_status("cannot drill — no cell at cursor")];
-                    "cannot drill — no cell at cursor",
-                )];
             };
             return DrillIntoCell { key }.execute(ctx);
         }
-        // Edit path: prefer records display value (includes pending edits),
+        EnterEditMode {
-        // else the underlying cell's stored value.
+            initial_value: ctx.display_value.clone(),
-        let initial_value = if let Some(v) = &ctx.records_value {
+        }
-            v.clone()
+        .execute(ctx)
-        } else {
-            ctx.cell_key
-                .as_ref()
-                .and_then(|k| ctx.model.get_cell(k).cloned())
-                .map(|v| v.to_string())
-                .unwrap_or_default()
-        };
-        EnterEditMode { initial_value }.execute(ctx)
     }
 }
 
@@ -721,8 +691,15 @@ impl Cmd for AddRecordRow {
         "add-record-row"
     }
     fn execute(&self, ctx: &CmdContext) -> Vec<Box<dyn Effect>> {
-        if ctx.records_col.is_none() {
+        let is_records = ctx
-            return vec![effect::set_status("add-record-row only works in records mode")];
+            .cell_key()
+            .as_ref()
+            .and_then(|k| crate::view::synthetic_record_info(k))
+            .is_some();
+        if !is_records {
+            return vec![effect::set_status(
+                "add-record-row only works in records mode",
+            )];
         }
         // Build a CellKey from the current page filters
         let view = ctx.model.active_view();
@@ -751,6 +728,30 @@ impl Cmd for AddRecordRow {
     }
 }
 
+/// Vim-style 'o': add a new record row below cursor and enter edit mode.
+#[derive(Debug)]
+pub struct OpenRecordRow;
+impl Cmd for OpenRecordRow {
+    fn name(&self) -> &'static str {
+        "open-record-row"
+    }
+    fn execute(&self, ctx: &CmdContext) -> Vec<Box<dyn Effect>> {
+        let is_records = ctx
+            .cell_key()
+            .as_ref()
+            .and_then(|k| crate::view::synthetic_record_info(k))
+            .is_some();
+        if !is_records {
+            return vec![effect::set_status(
+                "open-record-row only works in records mode",
+            )];
+        }
+        let mut effects = AddRecordRow.execute(ctx);
+        effects.push(Box::new(effect::EnterEditAtCursor));
+        effects
+    }
+}
+
 /// Typewriter-style advance: move down, wrap to top of next column at bottom.
 #[derive(Debug)]
 pub struct EnterAdvance {
@@ -804,10 +805,9 @@ impl Cmd for SearchNavigate {
             return vec![];
         }
 
-        let layout = GridLayout::new(ctx.model, ctx.model.active_view());
         let (cur_row, cur_col) = ctx.selected;
-        let total_rows = layout.row_count().max(1);
+        let total_rows = ctx.row_count().max(1);
-        let total_cols = layout.col_count().max(1);
+        let total_cols = ctx.col_count().max(1);
         let total = total_rows * total_cols;
         let cur_flat = cur_row * total_cols + cur_col;
 
@@ -815,11 +815,11 @@ impl Cmd for SearchNavigate {
             .filter(|&flat| {
                 let ri = flat / total_cols;
                 let ci = flat % total_cols;
-                let key = match layout.cell_key(ri, ci) {
+                let key = match ctx.layout.cell_key(ri, ci) {
                     Some(k) => k,
                     None => return false,
                 };
-                let s = match ctx.model.evaluate_aggregated(&key, &layout.none_cats) {
+                let s = match ctx.model.evaluate_aggregated(&key, ctx.none_cats()) {
                     Some(CellValue::Number(n)) => format!("{n}"),
                     Some(CellValue::Text(t)) => t,
                     None => String::new(),
@@ -1018,9 +1018,8 @@ impl Cmd for ToggleGroupUnderCursor {
         "toggle-group-under-cursor"
     }
     fn execute(&self, ctx: &CmdContext) -> Vec<Box<dyn Effect>> {
-        let layout = GridLayout::new(ctx.model, ctx.model.active_view());
         let sel_row = ctx.selected.0;
-        let Some((cat, group)) = layout.row_group_for(sel_row) else {
+        let Some((cat, group)) = ctx.layout.row_group_for(sel_row) else {
             return vec![];
         };
         vec![
@@ -1041,9 +1040,8 @@ impl Cmd for ToggleColGroupUnderCursor {
         "toggle-col-group-under-cursor"
     }
     fn execute(&self, ctx: &CmdContext) -> Vec<Box<dyn Effect>> {
-        let layout = GridLayout::new(ctx.model, ctx.model.active_view());
         let sel_col = ctx.selected.1;
-        let Some((cat, group)) = layout.col_group_for(sel_col) else {
+        let Some((cat, group)) = ctx.layout.col_group_for(sel_col) else {
             return vec![];
         };
         // After toggling, col_count may shrink — clamp selection
@@ -1067,12 +1065,12 @@ impl Cmd for HideSelectedRowItem {
         "hide-selected-row-item"
     }
     fn execute(&self, ctx: &CmdContext) -> Vec<Box<dyn Effect>> {
-        let layout = GridLayout::new(ctx.model, ctx.model.active_view());
+        let Some(cat_name) = ctx.layout.row_cats.first().cloned() else {
-        let Some(cat_name) = layout.row_cats.first().cloned() else {
             return vec![];
         };
         let sel_row = ctx.selected.0;
-        let Some(items) = layout
+        let Some(items) = ctx
+            .layout
             .row_items
             .iter()
             .filter_map(|e| {
@@ -1199,7 +1197,7 @@ impl Cmd for DrillIntoCell {
         // Previously-aggregated categories (none_cats) stay on Axis::None so
         // they don't filter records; they'll appear as columns in records mode.
         // Skip virtual categories — we already set _Index/_Dim above.
-        for cat in &ctx.none_cats {
+        for cat in ctx.none_cats() {
             if fixed_cats.contains(cat) || cat.starts_with('_') {
                 continue;
             }
@@ -1436,64 +1434,38 @@ impl Cmd for ToggleRecordsMode {
         "toggle-records-mode"
     }
     fn execute(&self, ctx: &CmdContext) -> Vec<Box<dyn Effect>> {
-        use crate::view::Axis;
+        let is_records = ctx.layout.is_records_mode();
-        let view = ctx.model.active_view();
-
-        // Detect current state
-        let is_records = view
-            .category_axes
-            .get("_Index")
-            .copied()
-            == Some(Axis::Row)
-            && view.category_axes.get("_Dim").copied() == Some(Axis::Column);
-
-        let mut effects: Vec<Box<dyn Effect>> = Vec::new();
 
         if is_records {
-            // Switch back to pivot: auto-assign axes
+            // Navigate back to the previous view (restores original axes)
-            // First regular category → Row, second → Column, rest → Page,
+            return vec![Box::new(effect::ViewBack), effect::set_status("Pivot mode")];
-            // virtuals/labels → None.
+        }
-            let mut row_done = false;
+
-            let mut col_done = false;
+        let mut effects: Vec<Box<dyn Effect>> = Vec::new();
-            for (name, cat) in &ctx.model.categories {
+        let records_name = "_Records".to_string();
-                let axis = if !cat.kind.is_regular() {
+
-                    Axis::None
+        // Create (or replace) a _Records view and switch to it
-                } else if !row_done {
+        effects.push(Box::new(effect::CreateView(records_name.clone())));
-                    row_done = true;
+        effects.push(Box::new(effect::SwitchView(records_name)));
-                    Axis::Row
+
-                } else if !col_done {
+        // _Index on Row, _Dim on Column, everything else → None
-                    col_done = true;
+        effects.push(Box::new(effect::SetAxis {
-                    Axis::Column
+            category: "_Index".to_string(),
-                } else {
+            axis: crate::view::Axis::Row,
-                    Axis::Page
+        }));
-                };
+        effects.push(Box::new(effect::SetAxis {
+            category: "_Dim".to_string(),
+            axis: crate::view::Axis::Column,
+        }));
+        for name in ctx.model.categories.keys() {
+            if name != "_Index" && name != "_Dim" {
                 effects.push(Box::new(effect::SetAxis {
                     category: name.clone(),
-                    axis,
+                    axis: crate::view::Axis::None,
                 }));
             }
-            effects.push(effect::set_status("Pivot mode"));
-        } else {
-            // Switch to records mode
-            effects.push(Box::new(effect::SetAxis {
-                category: "_Index".to_string(),
-                axis: Axis::Row,
-            }));
-            effects.push(Box::new(effect::SetAxis {
-                category: "_Dim".to_string(),
-                axis: Axis::Column,
-            }));
-            // Everything else → None
-            for name in ctx.model.categories.keys() {
-                if name != "_Index" && name != "_Dim" {
-                    effects.push(Box::new(effect::SetAxis {
-                        category: name.clone(),
-                        axis: Axis::None,
-                    }));
-                }
-            }
-            effects.push(effect::set_status("Records mode"));
         }
+        effects.push(effect::set_status("Records mode"));
         effects
     }
 }
@@ -1928,14 +1900,34 @@ impl Cmd for PopChar {
 
 /// Commit a cell edit: set cell value, advance cursor, return to Normal.
 /// In records mode, stages the edit in drill_state.pending_edits instead of
-/// writing directly to the model.
+/// Commit a cell value: for synthetic records keys, stage in drill pending edits
+/// or apply directly; for real keys, write to the model.
+fn commit_cell_value(key: &CellKey, value: &str, effects: &mut Vec<Box<dyn Effect>>) {
+    if let Some((record_idx, col_name)) = crate::view::synthetic_record_info(key) {
+        effects.push(Box::new(effect::SetDrillPendingEdit {
+            record_idx,
+            col_name,
+            new_value: value.to_string(),
+        }));
+    } else if value.is_empty() {
+        effects.push(Box::new(effect::ClearCell(key.clone())));
+        effects.push(effect::mark_dirty());
+    } else if let Ok(n) = value.parse::<f64>() {
+        effects.push(Box::new(effect::SetCell(key.clone(), CellValue::Number(n))));
+        effects.push(effect::mark_dirty());
+    } else {
+        effects.push(Box::new(effect::SetCell(key.clone(), CellValue::Text(value.to_string()))));
+        effects.push(effect::mark_dirty());
+    }
+}
+
+/// Commit a cell edit: set cell value, advance cursor, return to editing.
+/// In records mode with drill, stages the edit in drill_state.pending_edits.
+/// In records mode without drill or in pivot mode, writes directly to the model.
 #[derive(Debug)]
 pub struct CommitCellEdit {
-    pub key: crate::model::cell::CellKey,
+    pub key: CellKey,
     pub value: String,
-    /// Records-mode edit: (record_idx, column_name). When Some, stage in
-    /// pending_edits; otherwise write to the model directly.
-    pub records_edit: Option<(usize, String)>,
 }
 impl Cmd for CommitCellEdit {
     fn name(&self) -> &'static str {
@@ -1944,29 +1936,7 @@ impl Cmd for CommitCellEdit {
     fn execute(&self, ctx: &CmdContext) -> Vec<Box<dyn Effect>> {
         let mut effects: Vec<Box<dyn Effect>> = Vec::new();
 
-        if let Some((record_idx, col_name)) = &self.records_edit {
+        commit_cell_value(&self.key, &self.value, &mut effects);
-            // Stage the edit in drill_state.pending_edits
-            effects.push(Box::new(effect::SetDrillPendingEdit {
-                record_idx: *record_idx,
-                col_name: col_name.clone(),
-                new_value: self.value.clone(),
-            }));
-        } else if self.value.is_empty() {
-            effects.push(Box::new(effect::ClearCell(self.key.clone())));
-            effects.push(effect::mark_dirty());
-        } else if let Ok(n) = self.value.parse::<f64>() {
-            effects.push(Box::new(effect::SetCell(
-                self.key.clone(),
-                CellValue::Number(n),
-            )));
-            effects.push(effect::mark_dirty());
-        } else {
-            effects.push(Box::new(effect::SetCell(
-                self.key.clone(),
-                CellValue::Text(self.value.clone()),
-            )));
-            effects.push(effect::mark_dirty());
-        }
         // Advance cursor down (typewriter-style) and re-enter edit mode
         // at the new cell so the user can continue data entry.
         let adv = EnterAdvance {
@@ -1978,6 +1948,36 @@ impl Cmd for CommitCellEdit {
     }
 }
 
+/// Tab in editing: commit cell, move right, re-enter edit mode (Excel-style).
+#[derive(Debug)]
+pub struct CommitAndAdvanceRight {
+    pub key: CellKey,
+    pub value: String,
+    pub cursor: CursorState,
+}
+impl Cmd for CommitAndAdvanceRight {
+    fn name(&self) -> &'static str {
+        "commit-and-advance-right"
+    }
+    fn execute(&self, _ctx: &CmdContext) -> Vec<Box<dyn Effect>> {
+        let mut effects: Vec<Box<dyn Effect>> = Vec::new();
+        commit_cell_value(&self.key, &self.value, &mut effects);
+        // Move right instead of down
+        let col_max = self.cursor.col_count.saturating_sub(1);
+        let nc = (self.cursor.col + 1).min(col_max);
+        effects.extend(viewport_effects(
+            self.cursor.row,
+            nc,
+            self.cursor.row_offset,
+            self.cursor.col_offset,
+            self.cursor.visible_rows,
+            self.cursor.visible_cols,
+        ));
+        effects.push(Box::new(effect::EnterEditAtCursor));
+        effects
+    }
+}
+
 /// Commit a formula from the formula edit buffer.
 #[derive(Debug)]
 pub struct CommitFormula;
@@ -2430,7 +2430,7 @@ pub fn default_registry() -> CmdRegistry {
             }))
         },
         |_args, ctx| {
-            let key = ctx.cell_key.clone().ok_or("no cell at cursor")?;
+            let key = ctx.cell_key().clone().ok_or("no cell at cursor")?;
             Ok(Box::new(ClearCellCommand { key }))
         },
     );
@@ -2482,58 +2482,20 @@ pub fn default_registry() -> CmdRegistry {
             }))
         },
     );
-    r.register(
+    // Jump-to-edge commands: first/last row/col
-        &JumpToFirstRow { col: 0 },
+    macro_rules! reg_jump {
-        |_| Ok(Box::new(JumpToFirstRow { col: 0 })),
+        ($r:expr, $is_row:expr, $end:expr, $name:expr) => {
-        |_, ctx| {
+            $r.register(
-            Ok(Box::new(JumpToFirstRow {
+                &JumpToEdge { cursor: CursorState::default(), is_row: $is_row, end: $end, cmd_name: $name },
-                col: ctx.selected.1,
+                |_| Ok(Box::new(JumpToEdge { cursor: CursorState::default(), is_row: $is_row, end: $end, cmd_name: $name })),
-            }))
+                |_, ctx| Ok(Box::new(JumpToEdge { cursor: CursorState::from_ctx(ctx), is_row: $is_row, end: $end, cmd_name: $name })),
-        },
+            );
-    );
+        };
-    r.register(
+    }
-        &JumpToLastRow { col: 0, row_count: 0, row_offset: 0 },
+    reg_jump!(r, true,  false, "jump-first-row");
-        |_| {
+    reg_jump!(r, true,  true,  "jump-last-row");
-            Ok(Box::new(JumpToLastRow {
+    reg_jump!(r, false, false, "jump-first-col");
-                col: 0,
+    reg_jump!(r, false, true,  "jump-last-col");
-                row_count: 0,
-                row_offset: 0,
-            }))
-        },
-        |_, ctx| {
-            Ok(Box::new(JumpToLastRow {
-                col: ctx.selected.1,
-                row_count: ctx.row_count,
-                row_offset: ctx.row_offset,
-            }))
-        },
-    );
-    r.register(
-        &JumpToFirstCol { row: 0 },
-        |_| Ok(Box::new(JumpToFirstCol { row: 0 })),
-        |_, ctx| {
-            Ok(Box::new(JumpToFirstCol {
-                row: ctx.selected.0,
-            }))
-        },
-    );
-    r.register(
-        &JumpToLastCol { row: 0, col_count: 0, col_offset: 0 },
-        |_| {
-            Ok(Box::new(JumpToLastCol {
-                row: 0,
-                col_count: 0,
-                col_offset: 0,
-            }))
-        },
-        |_, ctx| {
-            Ok(Box::new(JumpToLastCol {
-                row: ctx.selected.0,
-                col_count: ctx.col_count,
-                col_offset: ctx.col_offset,
-            }))
-        },
-    );
     r.register(
         &ScrollRows { delta: 0, cursor: CursorState::default() },
         |args| {
@@ -2562,6 +2524,25 @@ pub fn default_registry() -> CmdRegistry {
             }))
         },
     );
+    r.register(
+        &PageScroll { direction: 0, cursor: CursorState::default() },
+        |args| {
+            require_args("page-scroll", args, 1)?;
+            let dir = args[0].parse::<i32>().map_err(|e| e.to_string())?;
+            Ok(Box::new(PageScroll {
+                direction: dir,
+                cursor: CursorState::default(),
+            }))
+        },
+        |args, ctx| {
+            require_args("page-scroll", args, 1)?;
+            let dir = args[0].parse::<i32>().map_err(|e| e.to_string())?;
+            Ok(Box::new(PageScroll {
+                direction: dir,
+                cursor: CursorState::from_ctx(ctx),
+            }))
+        },
+    );
     r.register(
         &EnterAdvance { cursor: CursorState::default() },
         |_| {
@@ -2597,12 +2578,14 @@ pub fn default_registry() -> CmdRegistry {
             }))
         },
         |_args, ctx| {
-            let key = ctx.cell_key.clone().ok_or("no cell at cursor")?;
+            let key = ctx.cell_key().clone().ok_or("no cell at cursor")?;
             Ok(Box::new(YankCell { key }))
         },
     );
     r.register(
-        &PasteCell { key: CellKey::new(vec![]) },
+        &PasteCell {
+            key: CellKey::new(vec![]),
+        },
         |args| {
             if args.is_empty() {
                 return Err("paste requires at least one Cat/Item coordinate".into());
@@ -2612,11 +2595,11 @@ pub fn default_registry() -> CmdRegistry {
             }))
         },
         |_args, ctx| {
-            let key = ctx.cell_key.clone().ok_or("no cell at cursor")?;
+            let key = ctx.cell_key().clone().ok_or("no cell at cursor")?;
             Ok(Box::new(PasteCell { key }))
         },
     );
-    // clear-cell is registered above (unified: ctx.cell_key or explicit coords)
+    // clear-cell is registered above (unified: ctx.cell_key() or explicit coords)
 
     // ── View / page ──────────────────────────────────────────────────────
     r.register_nullary(|| Box::new(TransposeAxes));
@@ -2663,7 +2646,7 @@ pub fn default_registry() -> CmdRegistry {
             }))
         },
         |_args, ctx| {
-            let key = ctx.cell_key.clone().ok_or("no cell at cursor")?;
+            let key = ctx.cell_key().clone().ok_or("no cell at cursor")?;
             Ok(Box::new(DrillIntoCell { key }))
         },
     );
@@ -2824,6 +2807,7 @@ pub fn default_registry() -> CmdRegistry {
         Box::new(DeleteFormulaAtCursor)
     });
     r.register_nullary(|| Box::new(AddRecordRow));
+    r.register_nullary(|| Box::new(OpenRecordRow));
     r.register_nullary(|| Box::new(TogglePruneEmpty));
     r.register_nullary(|| Box::new(ToggleRecordsMode));
     r.register_nullary(|| Box::new(CycleAxisAtCursor));
@@ -2877,35 +2861,36 @@ pub fn default_registry() -> CmdRegistry {
         &CommitCellEdit {
             key: CellKey::new(vec![]),
             value: String::new(),
-            records_edit: None,
         },
         |args| {
-            // parse: commit-cell-edit <value> <Cat/Item>...
             if args.len() < 2 {
                 return Err("commit-cell-edit requires a value and coords".into());
             }
             Ok(Box::new(CommitCellEdit {
                 key: parse_cell_key_from_args(&args[1..]),
                 value: args[0].clone(),
-                records_edit: None,
             }))
         },
         |_args, ctx| {
             let value = read_buffer(ctx, "edit");
-            // In records mode, stage the edit instead of writing to the model
+            let key = ctx.cell_key().clone().ok_or("no cell at cursor")?;
-            if let Some(col_name) = &ctx.records_col {
+            Ok(Box::new(CommitCellEdit { key, value }))
-                let record_idx = ctx.selected.0;
+        },
-                return Ok(Box::new(CommitCellEdit {
+    );
-                    key: CellKey::new(vec![]), // ignored in records mode
+    r.register(
-                    value,
+        &CommitAndAdvanceRight {
-                    records_edit: Some((record_idx, col_name.clone())),
+            key: CellKey::new(vec![]),
-                }));
+            value: String::new(),
-            }
+            cursor: CursorState::default(),
-            let key = ctx.cell_key.clone().ok_or("no cell at cursor")?;
+        },
-            Ok(Box::new(CommitCellEdit {
+        |_| Err("commit-and-advance-right requires context".into()),
+        |_args, ctx| {
+            let value = read_buffer(ctx, "edit");
+            let key = ctx.cell_key().clone().ok_or("no cell at cursor")?;
+            Ok(Box::new(CommitAndAdvanceRight {
                 key,
                 value,
-                records_edit: None,
+                cursor: CursorState::from_ctx(ctx),
             }))
         },
     );
@@ -2951,12 +2936,16 @@ mod tests {
     static EMPTY_EXPANDED: std::sync::LazyLock<std::collections::HashSet<String>> =
         std::sync::LazyLock::new(std::collections::HashSet::new);
 
-    fn make_ctx(model: &Model) -> CmdContext<'_> {
+    fn make_layout(model: &Model) -> GridLayout {
+        GridLayout::new(model, model.active_view())
+    }
+
+    fn make_ctx<'a>(model: &'a Model, layout: &'a GridLayout) -> CmdContext<'a> {
         let view = model.active_view();
-        let layout = GridLayout::new(model, view);
         let (sr, sc) = view.selected;
         CmdContext {
             model,
+            layout,
             mode: &AppMode::Normal,
             selected: view.selected,
             row_offset: view.row_offset,
@@ -2973,14 +2962,15 @@ mod tests {
             view_panel_cursor: 0,
             tile_cat_idx: 0,
             buffers: &EMPTY_BUFFERS,
-            none_cats: layout.none_cats.clone(),
+            view_back_stack: &[],
-            view_back_stack: Vec::new(),
+            view_forward_stack: &[],
-            view_forward_stack: Vec::new(),
+            display_value: {
-            records_col: None,
+                let key = layout.cell_key(sr, sc);
-            records_value: None,
+                key.as_ref()
-            cell_key: layout.cell_key(sr, sc),
+                    .and_then(|k| model.get_cell(k).cloned())
-            row_count: layout.row_count(),
+                    .map(|v| v.to_string())
-            col_count: layout.col_count(),
+                    .unwrap_or_default()
+            },
             visible_rows: 20,
             visible_cols: 8,
             expanded_cats: &EMPTY_EXPANDED,
@@ -3002,7 +2992,8 @@ mod tests {
     #[test]
     fn move_selection_down_produces_set_selected() {
         let m = two_cat_model();
-        let ctx = make_ctx(&m);
+        let layout = make_layout(&m);
+        let ctx = make_ctx(&m, &layout);
         let cmd = MoveSelection {
             dr: 1,
             dc: 0,
@@ -3016,7 +3007,8 @@ mod tests {
     #[test]
     fn move_selection_clamps_to_bounds() {
         let m = two_cat_model();
-        let ctx = make_ctx(&m);
+        let layout = make_layout(&m);
+        let ctx = make_ctx(&m, &layout);
         // Try to move way past the end
         let cmd = MoveSelection {
             dr: 100,
@@ -3032,7 +3024,8 @@ mod tests {
         let m = two_cat_model();
         let mut bufs = HashMap::new();
         bufs.insert("command".to_string(), "q".to_string());
-        let mut ctx = make_ctx(&m);
+        let layout = make_layout(&m);
+        let mut ctx = make_ctx(&m, &layout);
         ctx.dirty = true;
         ctx.buffers = &bufs;
         let cmd = ExecuteCommand;
@@ -3046,7 +3039,8 @@ mod tests {
         let m = two_cat_model();
         let mut bufs = HashMap::new();
         bufs.insert("command".to_string(), "q".to_string());
-        let mut ctx = make_ctx(&m);
+        let layout = make_layout(&m);
+        let mut ctx = make_ctx(&m, &layout);
         ctx.buffers = &bufs;
         let cmd = ExecuteCommand;
         let effects = cmd.execute(&ctx);
@@ -3065,9 +3059,10 @@ mod tests {
             ("Month".to_string(), "Jan".to_string()),
         ]);
         m.set_cell(key, CellValue::Number(42.0));
-        let ctx = make_ctx(&m);
+        let layout = make_layout(&m);
+        let ctx = make_ctx(&m, &layout);
         let cmd = ClearCellCommand {
-            key: ctx.cell_key.clone().unwrap(),
+            key: ctx.cell_key().clone().unwrap(),
         };
         let effects = cmd.execute(&ctx);
         assert_eq!(effects.len(), 2); // ClearCell + MarkDirty
@@ -3081,9 +3076,10 @@ mod tests {
             ("Month".to_string(), "Jan".to_string()),
         ]);
         m.set_cell(key, CellValue::Number(99.0));
-        let ctx = make_ctx(&m);
+        let layout = make_layout(&m);
+        let ctx = make_ctx(&m, &layout);
         let cmd = YankCell {
-            key: ctx.cell_key.clone().unwrap(),
+            key: ctx.cell_key().clone().unwrap(),
         };
         let effects = cmd.execute(&ctx);
         assert_eq!(effects.len(), 2); // SetYanked + SetStatus
@@ -3092,7 +3088,8 @@ mod tests {
     #[test]
     fn toggle_panel_open_and_focus() {
         let m = two_cat_model();
-        let ctx = make_ctx(&m);
+        let layout = make_layout(&m);
+        let ctx = make_ctx(&m, &layout);
         let cmd = TogglePanelAndFocus {
             panel: effect::Panel::Formula,
             open: true,
@@ -3110,7 +3107,8 @@ mod tests {
     #[test]
     fn toggle_panel_close_and_unfocus() {
         let m = two_cat_model();
-        let ctx = make_ctx(&m);
+        let layout = make_layout(&m);
+        let ctx = make_ctx(&m, &layout);
         let cmd = TogglePanelAndFocus {
             panel: effect::Panel::Formula,
             open: false,
@@ -3123,7 +3121,8 @@ mod tests {
     #[test]
     fn enter_advance_moves_down() {
         let m = two_cat_model();
-        let ctx = make_ctx(&m);
+        let layout = make_layout(&m);
+        let ctx = make_ctx(&m, &layout);
         let cmd = EnterAdvance {
             cursor: CursorState::from_ctx(&ctx),
         };
@@ -3139,7 +3138,8 @@ mod tests {
     #[test]
     fn search_navigate_with_empty_query_returns_nothing() {
         let m = two_cat_model();
-        let ctx = make_ctx(&m);
+        let layout = make_layout(&m);
+        let ctx = make_ctx(&m, &layout);
         let cmd = SearchNavigate(true);
         let effects = cmd.execute(&ctx);
         assert!(effects.is_empty());
@@ -3148,7 +3148,8 @@ mod tests {
     #[test]
     fn enter_edit_mode_produces_editing_mode() {
         let m = two_cat_model();
-        let ctx = make_ctx(&m);
+        let layout = make_layout(&m);
+        let ctx = make_ctx(&m, &layout);
         let cmd = EnterEditMode {
             initial_value: String::new(),
         };
@@ -3161,7 +3162,8 @@ mod tests {
     #[test]
     fn enter_tile_select_with_categories() {
         let m = two_cat_model();
-        let ctx = make_ctx(&m);
+        let layout = make_layout(&m);
+        let ctx = make_ctx(&m, &layout);
         let cmd = EnterTileSelect;
         let effects = cmd.execute(&ctx);
         assert_eq!(effects.len(), 2); // SetTileCatIdx + ChangeMode
@@ -3177,7 +3179,8 @@ mod tests {
         // Models always have virtual categories (_Index, _Dim), so tile
         // select always has something to operate on.
         let m = Model::new("Empty");
-        let ctx = make_ctx(&m);
+        let layout = make_layout(&m);
+        let ctx = make_ctx(&m, &layout);
         let cmd = EnterTileSelect;
         let effects = cmd.execute(&ctx);
         assert_eq!(effects.len(), 2); // SetTileCatIdx + ChangeMode
@@ -3186,7 +3189,8 @@ mod tests {
     #[test]
     fn toggle_group_under_cursor_returns_empty_without_groups() {
         let m = two_cat_model();
-        let ctx = make_ctx(&m);
+        let layout = make_layout(&m);
+        let ctx = make_ctx(&m, &layout);
         let cmd = ToggleGroupUnderCursor;
         let effects = cmd.execute(&ctx);
         // No groups defined, so nothing to toggle
@@ -3196,7 +3200,8 @@ mod tests {
     #[test]
     fn search_or_category_add_without_query_opens_category_add() {
         let m = two_cat_model();
-        let ctx = make_ctx(&m);
+        let layout = make_layout(&m);
+        let ctx = make_ctx(&m, &layout);
         let cmd = SearchOrCategoryAdd;
         let effects = cmd.execute(&ctx);
         assert_eq!(effects.len(), 2); // SetPanelOpen + ChangeMode
@@ -3210,7 +3215,8 @@ mod tests {
     #[test]
     fn cycle_panel_focus_with_no_panels_open() {
         let m = two_cat_model();
-        let ctx = make_ctx(&m);
+        let layout = make_layout(&m);
+        let ctx = make_ctx(&m, &layout);
         let cmd = CyclePanelFocus {
             formula_open: false,
             category_open: false,
@@ -3223,7 +3229,8 @@ mod tests {
     #[test]
     fn cycle_panel_focus_with_formula_panel_open() {
         let m = two_cat_model();
-        let mut ctx = make_ctx(&m);
+        let layout = make_layout(&m);
+        let mut ctx = make_ctx(&m, &layout);
         ctx.formula_panel_open = true;
         let cmd = CyclePanelFocus {
             formula_open: true,

src/command/keymap.rs

@@ -266,10 +266,14 @@ impl KeymapSet {
         normal.bind(KeyCode::Char('G'), none, "jump-last-row");
         normal.bind(KeyCode::Char('0'), none, "jump-first-col");
         normal.bind(KeyCode::Char('$'), none, "jump-last-col");
+        normal.bind(KeyCode::Home, none, "jump-first-col");
+        normal.bind(KeyCode::End, none, "jump-last-col");
 
         // Scroll
         normal.bind_args(KeyCode::Char('d'), ctrl, "scroll-rows", vec!["5".into()]);
         normal.bind_args(KeyCode::Char('u'), ctrl, "scroll-rows", vec!["-5".into()]);
+        normal.bind_args(KeyCode::PageDown, none, "page-scroll", vec!["1".into()]);
+        normal.bind_args(KeyCode::PageUp, none, "page-scroll", vec!["-1".into()]);
 
         // Cell operations
         normal.bind(KeyCode::Char('x'), none, "clear-cell");
@@ -357,7 +361,7 @@ impl KeymapSet {
         // Drill into aggregated cell / view history / add row
         normal.bind(KeyCode::Char('>'), none, "drill-into-cell");
         normal.bind(KeyCode::Char('<'), none, "view-back");
-        normal.bind(KeyCode::Char('o'), none, "add-record-row");
+        normal.bind(KeyCode::Char('o'), none, "open-record-row");
 
         // Records mode toggle and prune toggle
         normal.bind(KeyCode::Char('R'), none, "toggle-records-mode");
@@ -560,6 +564,7 @@ impl KeymapSet {
         let mut ed = Keymap::new();
         ed.bind_args(KeyCode::Esc, none, "enter-mode", vec!["normal".into()]);
         ed.bind(KeyCode::Enter, none, "commit-cell-edit");
+        ed.bind(KeyCode::Tab, none, "commit-and-advance-right");
         ed.bind_args(KeyCode::Backspace, none, "pop-char", vec!["edit".into()]);
         ed.bind_any_char("append-char", vec!["edit".into()]);
         set.insert(ModeKey::Editing, Arc::new(ed));

src/format.rs

@@ -0,0 +1,50 @@
+use crate::model::cell::CellValue;
+
+/// Format a CellValue for display with number formatting options.
+pub fn format_value(v: Option<&CellValue>, comma: bool, decimals: u8) -> String {
+    match v {
+        Some(CellValue::Number(n)) => format_f64(*n, comma, decimals),
+        Some(CellValue::Text(s)) => s.clone(),
+        None => String::new(),
+    }
+}
+
+/// Parse a number format string like ",.0" into (use_commas, decimal_places).
+pub fn parse_number_format(fmt: &str) -> (bool, u8) {
+    let comma = fmt.contains(',');
+    let decimals = fmt
+        .rfind('.')
+        .and_then(|i| fmt[i + 1..].parse::<u8>().ok())
+        .unwrap_or(0);
+    (comma, decimals)
+}
+
+/// Format an f64 with optional comma grouping and decimal places.
+pub fn format_f64(n: f64, comma: bool, decimals: u8) -> String {
+    let formatted = format!("{:.prec$}", n, prec = decimals as usize);
+    if !comma {
+        return formatted;
+    }
+    let (int_part, dec_part) = if let Some(dot) = formatted.find('.') {
+        (&formatted[..dot], Some(&formatted[dot..]))
+    } else {
+        (&formatted[..], None)
+    };
+    let is_neg = int_part.starts_with('-');
+    let digits = if is_neg { &int_part[1..] } else { int_part };
+    let mut result = String::new();
+    for (idx, c) in digits.chars().rev().enumerate() {
+        if idx > 0 && idx % 3 == 0 {
+            result.push(',');
+        }
+        result.push(c);
+    }
+    if is_neg {
+        result.push('-');
+    }
+    let mut out: String = result.chars().rev().collect();
+    if let Some(dec) = dec_part {
+        out.push_str(dec);
+    }
+    out
+}

src/main.rs

@@ -1,5 +1,6 @@
 mod command;
 mod draw;
+mod format;
 mod formula;
 mod import;
 mod model;

src/persistence/mod.rs

@@ -458,17 +458,7 @@ pub fn export_csv(model: &Model, view_name: &str, path: &Path) -> Result<()> {
             out.push(',');
         }
         let row_values: Vec<String> = (0..layout.col_count())
-            .map(|ci| {
+            .map(|ci| layout.display_text(model, ri, ci, false, 0))
-                if layout.is_records_mode() {
-                    layout.records_display(ri, ci).unwrap_or_default()
-                } else {
-                    layout
-                        .cell_key(ri, ci)
-                        .and_then(|key| model.evaluate_aggregated(&key, &layout.none_cats))
-                        .map(|v| v.to_string())
-                        .unwrap_or_default()
-                }
-            })
             .collect();
         out.push_str(&row_values.join(","));
         out.push('\n');

src/ui/app.rs

@@ -5,23 +5,25 @@ use std::path::PathBuf;
 use std::sync::Arc;
 use std::time::{Duration, Instant};
 
+use std::rc::Rc;
+
 use crate::command::cmd::CmdContext;
 use crate::command::keymap::{Keymap, KeymapSet};
 use crate::import::wizard::ImportWizard;
 use crate::model::cell::CellValue;
 use crate::model::Model;
 use crate::persistence;
+use crate::ui::grid::{
+    compute_col_widths, compute_row_header_width, compute_visible_cols, parse_number_format,
+};
 use crate::view::GridLayout;
 
 /// Drill-down state: frozen record snapshot + pending edits that have not
 /// yet been applied to the model.
 #[derive(Debug, Clone, Default)]
 pub struct DrillState {
-    /// Frozen snapshot of records shown in the drill view.
+    /// Frozen snapshot of records shown in the drill view (Rc for cheap cloning).
-    pub records: Vec<(
+    pub records: Rc<Vec<(crate::model::cell::CellKey, crate::model::cell::CellValue)>>,
-        crate::model::cell::CellKey,
-        crate::model::cell::CellValue,
-    )>,
     /// Pending edits keyed by (record_idx, column_name) → new string value.
     /// column_name is either "Value" or a category name.
     pub pending_edits: std::collections::HashMap<(usize, String), String>,
@@ -100,11 +102,18 @@ pub struct App {
     pub buffers: HashMap<String, String>,
     /// Transient keymap for Emacs-style prefix key sequences (g→gg, y→yy, etc.)
     pub transient_keymap: Option<Arc<Keymap>>,
+    /// Current grid layout, derived from model + view + drill_state.
+    /// Rebuilt via `rebuild_layout()` after state changes.
+    pub layout: GridLayout,
     keymap_set: KeymapSet,
 }
 
 impl App {
     pub fn new(model: Model, file_path: Option<PathBuf>) -> Self {
+        let layout = {
+            let view = model.active_view();
+            GridLayout::with_frozen_records(&model, view, None)
+        };
         Self {
             model,
             file_path,
@@ -131,17 +140,26 @@ impl App {
             expanded_cats: std::collections::HashSet::new(),
             buffers: HashMap::new(),
             transient_keymap: None,
+            layout,
             keymap_set: KeymapSet::default_keymaps(),
         }
     }
 
+    /// Rebuild the grid layout from current model, view, and drill state.
+    /// Note: `with_frozen_records` already handles pruning internally.
+    pub fn rebuild_layout(&mut self) {
+        let view = self.model.active_view();
+        let frozen = self.drill_state.as_ref().map(|s| Rc::clone(&s.records));
+        self.layout = GridLayout::with_frozen_records(&self.model, view, frozen);
+    }
+
     pub fn cmd_context(&self, key: KeyCode, _mods: KeyModifiers) -> CmdContext<'_> {
         let view = self.model.active_view();
-        let frozen_records = self.drill_state.as_ref().map(|s| s.records.clone());
+        let layout = &self.layout;
-        let layout = GridLayout::with_frozen_records(&self.model, view, frozen_records);
         let (sel_row, sel_col) = view.selected;
         CmdContext {
             model: &self.model,
+            layout,
             mode: &self.mode,
             selected: view.selected,
             row_offset: view.row_offset,
@@ -158,34 +176,39 @@ impl App {
             cat_panel_cursor: self.cat_panel_cursor,
             view_panel_cursor: self.view_panel_cursor,
             tile_cat_idx: self.tile_cat_idx,
-            cell_key: layout.cell_key(sel_row, sel_col),
+            view_back_stack: &self.view_back_stack,
-            row_count: layout.row_count(),
+            view_forward_stack: &self.view_forward_stack,
-            col_count: layout.col_count(),
+            display_value: {
-            none_cats: layout.none_cats.clone(),
+                let key = layout.cell_key(sel_row, sel_col);
-            view_back_stack: self.view_back_stack.clone(),
+                if let Some(k) = &key {
-            view_forward_stack: self.view_forward_stack.clone(),
+                    if let Some((idx, dim)) = crate::view::synthetic_record_info(k) {
-            records_col: if layout.is_records_mode() {
+                        self.drill_state
-                Some(layout.col_label(sel_col))
+                            .as_ref()
-            } else {
+                            .and_then(|s| s.pending_edits.get(&(idx, dim)).cloned())
-                None
+                            .or_else(|| layout.resolve_display(k))
+                            .unwrap_or_default()
+                    } else {
+                        self.model
+                            .get_cell(k)
+                            .map(|v| v.to_string())
+                            .unwrap_or_default()
+                    }
+                } else {
+                    String::new()
+                }
             },
-            records_value: if layout.is_records_mode() {
-                // Check pending edits first, then fall back to original
-                let col_name = layout.col_label(sel_col);
-                let pending = self.drill_state.as_ref().and_then(|s| {
-                    s.pending_edits.get(&(sel_row, col_name.clone())).cloned()
-                });
-                pending.or_else(|| layout.records_display(sel_row, sel_col))
-            } else {
-                None
-            },
-            // Approximate visible rows/cols from terminal size.
-            // Chrome: title(1) + border(2) + col_headers(n_col_levels) + separator(1)
-            //         + tile_bar(1) + status_bar(1) = ~8 rows of chrome.
             visible_rows: (self.term_height as usize).saturating_sub(8),
-            // Visible cols depends on column widths — use a rough estimate.
+            visible_cols: {
-            // The grid renderer does the precise calculation.
+                let (fmt_comma, fmt_decimals) = parse_number_format(&view.number_format);
-            visible_cols: ((self.term_width as usize).saturating_sub(30) / 12).max(1),
+                let col_widths = compute_col_widths(&self.model, layout, fmt_comma, fmt_decimals);
+                let row_header_width = compute_row_header_width(layout);
+                compute_visible_cols(
+                    &col_widths,
+                    row_header_width,
+                    self.term_width,
+                    view.col_offset,
+                )
+            },
             expanded_cats: &self.expanded_cats,
             key_code: key,
         }
@@ -195,6 +218,7 @@ impl App {
         for effect in effects {
             effect.apply(self);
         }
+        self.rebuild_layout();
     }
 
     /// True when the model has no categories yet (show welcome screen)
@@ -203,6 +227,8 @@ impl App {
     }
 
     pub fn handle_key(&mut self, key: KeyEvent) -> Result<()> {
+        self.rebuild_layout();
+
         // Transient keymap (prefix key sequence) takes priority
         if let Some(transient) = self.transient_keymap.take() {
             let effects = {
@@ -247,7 +273,7 @@ impl App {
     pub fn hint_text(&self) -> &'static str {
         match &self.mode {
             AppMode::Normal => "hjkl:nav  i:edit  R:records  P:prune  F/C/V:panels  T:tiles  [:]:page  >:drill  ::cmd",
-            AppMode::Editing { .. } => "Enter:commit  Esc:cancel",
+            AppMode::Editing { .. } => "Enter:commit  Tab:commit+right  Esc:cancel",
             AppMode::FormulaPanel => "n:new  d:delete  jk:nav  Esc:back",
             AppMode::FormulaEdit { .. } => "Enter:save  Esc:cancel  — type: Name = expression",
             AppMode::CategoryPanel => "jk:nav  Space:cycle-axis  n:new-cat  a:add-items  d:delete  Esc:back",
@@ -371,6 +397,187 @@ mod tests {
         assert_eq!(app.buffers.get("command").map(|s| s.as_str()), Some("q"));
     }
 
+    #[test]
+    fn col_offset_scrolls_when_cursor_moves_past_visible_columns() {
+        use crate::model::cell::{CellKey, CellValue};
+        // Create a model with 8 wide columns. Column item names are 30 chars
+        // each → column widths ~31 chars. With term_width=80, row header ~4,
+        // data area ~76 → only ~2 columns actually fit. But the rough estimate
+        // (80−30)/12 = 4 over-counts, so viewport_effects never scrolls.
+        let mut m = Model::new("T");
+        m.add_category("Row").unwrap();
+        m.add_category("Col").unwrap();
+        m.category_mut("Row").unwrap().add_item("R1");
+        for i in 0..8 {
+            let name = format!("VeryLongColumnItemName_{i:03}");
+            m.category_mut("Col").unwrap().add_item(&name);
+        }
+        // Populate a value so the model isn't empty
+        let key = CellKey::new(vec![
+            ("Row".to_string(), "R1".to_string()),
+            ("Col".to_string(), "VeryLongColumnItemName_000".to_string()),
+        ]);
+        m.set_cell(key, CellValue::Number(1.0));
+
+        let mut app = App::new(m, None);
+        app.term_width = 80;
+
+        // Press 'l' (right) 3 times to move cursor to column 3.
+        // Only ~2 columns fit in 76 chars of data area (each col ~26 chars wide),
+        // so column 3 is well off-screen. The buggy estimate (80−30)/12 = 4
+        // thinks 4 columns fit, so it won't scroll until col 4.
+        for _ in 0..3 {
+            app.handle_key(KeyEvent::new(KeyCode::Char('l'), KeyModifiers::NONE))
+                .unwrap();
+        }
+
+        assert_eq!(
+            app.model.active_view().selected.1,
+            3,
+            "cursor should be at column 3"
+        );
+        assert!(
+            app.model.active_view().col_offset > 0,
+            "col_offset should scroll when cursor moves past visible area (only ~2 cols fit \
+             in 80-char terminal with 26-char-wide columns), but col_offset is {}",
+            app.model.active_view().col_offset
+        );
+    }
+
+    #[test]
+    fn home_jumps_to_first_col() {
+        let mut app = two_col_model();
+        app.model.active_view_mut().selected = (1, 1);
+        app.handle_key(KeyEvent::new(KeyCode::Home, KeyModifiers::NONE))
+            .unwrap();
+        assert_eq!(app.model.active_view().selected, (1, 0));
+    }
+
+    #[test]
+    fn end_jumps_to_last_col() {
+        let mut app = two_col_model();
+        app.model.active_view_mut().selected = (1, 0);
+        app.handle_key(KeyEvent::new(KeyCode::End, KeyModifiers::NONE))
+            .unwrap();
+        assert_eq!(app.model.active_view().selected, (1, 1));
+    }
+
+    #[test]
+    fn page_down_scrolls_by_three_quarters_visible() {
+        let mut app = two_col_model();
+        // Add enough rows
+        for i in 0..30 {
+            app.model
+                .category_mut("Row")
+                .unwrap()
+                .add_item(&format!("R{i}"));
+        }
+        app.term_height = 28; // ~20 visible rows → delta = 15
+        app.model.active_view_mut().selected = (0, 0);
+        app.handle_key(KeyEvent::new(KeyCode::PageDown, KeyModifiers::NONE))
+            .unwrap();
+        assert_eq!(app.model.active_view().selected.1, 0, "column preserved");
+        assert!(
+            app.model.active_view().selected.0 > 0,
+            "row should advance on PageDown"
+        );
+        // 3/4 of ~20 = 15
+        assert_eq!(app.model.active_view().selected.0, 15);
+    }
+
+    #[test]
+    fn page_up_scrolls_backward() {
+        let mut app = two_col_model();
+        for i in 0..30 {
+            app.model
+                .category_mut("Row")
+                .unwrap()
+                .add_item(&format!("R{i}"));
+        }
+        app.term_height = 28;
+        app.model.active_view_mut().selected = (20, 0);
+        app.handle_key(KeyEvent::new(KeyCode::PageUp, KeyModifiers::NONE))
+            .unwrap();
+        assert_eq!(app.model.active_view().selected.0, 5);
+    }
+
+    #[test]
+    fn jump_last_row_scrolls_with_small_terminal() {
+        let mut app = two_col_model();
+        // Total rows: A, B, C + R0..R9 = 13 rows. Last row = 12.
+        for i in 0..10 {
+            app.model.category_mut("Row").unwrap().add_item(&format!("R{i}"));
+        }
+        app.term_height = 13; // ~5 visible rows
+        app.model.active_view_mut().selected = (0, 0);
+        // G jumps to last row (row 12)
+        app.handle_key(KeyEvent::new(KeyCode::Char('G'), KeyModifiers::NONE))
+            .unwrap();
+        let last = app.model.active_view().selected.0;
+        assert_eq!(last, 12, "should be at last row");
+        // With only ~5 visible rows and 13 rows, offset should scroll.
+        // Bug: hardcoded 20 means `12 >= 0 + 20` is false → no scroll.
+        let offset = app.model.active_view().row_offset;
+        assert!(
+            offset > 0,
+            "row_offset should scroll when last row is beyond visible area, but is {offset}"
+        );
+    }
+
+    #[test]
+    fn ctrl_d_scrolls_viewport_with_small_terminal() {
+        let mut app = two_col_model();
+        for i in 0..30 {
+            app.model
+                .category_mut("Row")
+                .unwrap()
+                .add_item(&format!("R{i}"));
+        }
+        app.term_height = 13; // ~5 visible rows
+        app.model.active_view_mut().selected = (0, 0);
+        // Ctrl+d scrolls by 5 rows
+        app.handle_key(KeyEvent::new(KeyCode::Char('d'), KeyModifiers::CONTROL))
+            .unwrap();
+        assert_eq!(app.model.active_view().selected.0, 5);
+        // Press Ctrl+d again — now at row 10 with only 5 visible rows,
+        // row_offset should have scrolled (not stay at 0 due to hardcoded 20)
+        app.handle_key(KeyEvent::new(KeyCode::Char('d'), KeyModifiers::CONTROL))
+            .unwrap();
+        assert_eq!(app.model.active_view().selected.0, 10);
+        assert!(
+            app.model.active_view().row_offset > 0,
+            "row_offset should scroll with small terminal, but is {}",
+            app.model.active_view().row_offset
+        );
+    }
+
+    #[test]
+    fn tab_in_edit_mode_commits_and_moves_right() {
+        let mut app = two_col_model();
+        app.model.active_view_mut().selected = (0, 0);
+        // Enter edit mode
+        app.handle_key(KeyEvent::new(KeyCode::Char('i'), KeyModifiers::NONE))
+            .unwrap();
+        assert!(matches!(app.mode, AppMode::Editing { .. }));
+        // Type a digit
+        app.handle_key(KeyEvent::new(KeyCode::Char('5'), KeyModifiers::NONE))
+            .unwrap();
+        // Press Tab — should commit, move right, re-enter edit mode
+        app.handle_key(KeyEvent::new(KeyCode::Tab, KeyModifiers::NONE))
+            .unwrap();
+        // Should be in edit mode on column 1
+        assert!(
+            matches!(app.mode, AppMode::Editing { .. }),
+            "should be in edit mode after Tab, but mode is {:?}",
+            app.mode
+        );
+        assert_eq!(
+            app.model.active_view().selected.1,
+            1,
+            "should have moved to column 1"
+        );
+    }
+
     #[test]
     fn command_mode_buffer_cleared_on_reentry() {
         use crossterm::event::KeyEvent;

src/ui/category_panel.rs

@@ -49,7 +49,7 @@ impl<'a> Widget for CategoryPanel<'a> {
         let is_active = matches!(self.mode, AppMode::CategoryPanel) || is_item_add || is_cat_add;
 
         let (border_color, title) = if is_active {
-            (Color::Cyan, " Categories  n:new  d:del  Space:axis ")
+            (Color::Cyan, " Categories ")
         } else {
             (Color::DarkGray, " Categories ")
         };

src/ui/effect.rs

@@ -97,15 +97,7 @@ pub struct EnterEditAtCursor;
 impl Effect for EnterEditAtCursor {
     fn apply(&self, app: &mut App) {
         let ctx = app.cmd_context(crossterm::event::KeyCode::Null, crossterm::event::KeyModifiers::NONE);
-        let value = if let Some(v) = &ctx.records_value {
+        let value = ctx.display_value.clone();
-            v.clone()
-        } else {
-            ctx.cell_key
-                .as_ref()
-                .and_then(|k| ctx.model.get_cell(k).cloned())
-                .map(|v| v.to_string())
-                .unwrap_or_default()
-        };
         drop(ctx);
         app.buffers.insert("edit".to_string(), value);
         app.mode = AppMode::Editing {
@@ -406,7 +398,7 @@ pub struct StartDrill(pub Vec<(CellKey, CellValue)>);
 impl Effect for StartDrill {
     fn apply(&self, app: &mut App) {
         app.drill_state = Some(super::app::DrillState {
-            records: self.0.clone(),
+            records: std::rc::Rc::new(self.0.clone()),
             pending_edits: std::collections::HashMap::new(),
         });
     }
@@ -838,6 +830,16 @@ pub enum Panel {
     View,
 }
 
+impl Panel {
+    pub fn mode(self) -> AppMode {
+        match self {
+            Panel::Formula => AppMode::FormulaPanel,
+            Panel::Category => AppMode::CategoryPanel,
+            Panel::View => AppMode::ViewPanel,
+        }
+    }
+}
+
 impl Effect for SetPanelOpen {
     fn apply(&self, app: &mut App) {
         match self.panel {

src/ui/grid.rs

@@ -6,7 +6,6 @@ use ratatui::{
 };
 use unicode_width::UnicodeWidthStr;
 
-use crate::model::cell::CellValue;
 use crate::model::Model;
 use crate::ui::app::AppMode;
 use crate::view::{AxisEntry, GridLayout};
@@ -23,6 +22,7 @@ const GROUP_COLLAPSED: &str = "▶";
 
 pub struct GridWidget<'a> {
     pub model: &'a Model,
+    pub layout: &'a GridLayout,
     pub mode: &'a AppMode,
     pub search_query: &'a str,
     pub buffers: &'a std::collections::HashMap<String, String>,
@@ -32,6 +32,7 @@ pub struct GridWidget<'a> {
 impl<'a> GridWidget<'a> {
     pub fn new(
         model: &'a Model,
+        layout: &'a GridLayout,
         mode: &'a AppMode,
         search_query: &'a str,
         buffers: &'a std::collections::HashMap<String, String>,
@@ -39,6 +40,7 @@ impl<'a> GridWidget<'a> {
     ) -> Self {
         Self {
             model,
+            layout,
             mode,
             search_query,
             buffers,
@@ -46,23 +48,9 @@ impl<'a> GridWidget<'a> {
         }
     }
 
-    /// In records mode, get the display text for (row, col): pending edit if
-    /// staged, otherwise the underlying record's value for that column.
-    fn records_cell_text(&self, layout: &GridLayout, row: usize, col: usize) -> String {
-        let col_name = layout.col_label(col);
-        let pending = self
-            .drill_state
-            .and_then(|s| s.pending_edits.get(&(row, col_name.clone())).cloned());
-        pending
-            .or_else(|| layout.records_display(row, col))
-            .unwrap_or_default()
-    }
-
     fn render_grid(&self, area: Rect, buf: &mut Buffer) {
         let view = self.model.active_view();
-
+        let layout = self.layout;
-        let frozen = self.drill_state.map(|s| s.records.clone());
-        let layout = GridLayout::with_frozen_records(self.model, view, frozen);
         let (sel_row, sel_col) = view.selected;
         let row_offset = view.row_offset;
         let col_offset = view.col_offset;
@@ -71,56 +59,9 @@ impl<'a> GridWidget<'a> {
         let n_col_levels = layout.col_cats.len().max(1);
         let n_row_levels = layout.row_cats.len().max(1);
 
-        // ── Adaptive column widths ────────────────────────────────────
+        let col_widths = compute_col_widths(self.model, &layout, fmt_comma, fmt_decimals);
-        // Size each column to fit its widest content (header + cell values)
-        // plus 1 char gap. Minimum MIN_COL_WIDTH, capped at MAX_COL_WIDTH.
-        let col_widths: Vec<u16> = {
-            let n = layout.col_count();
-            let mut widths = vec![0u16; n];
-            // Measure column header labels
-            for ci in 0..n {
-                let header = layout.col_label(ci);
-                let w = header.width() as u16;
-                if w > widths[ci] {
-                    widths[ci] = w;
-                }
-            }
-            // Measure cell content
-            if layout.is_records_mode() {
-                for ri in 0..layout.row_count() {
-                    for (ci, wref) in widths.iter_mut().enumerate().take(n) {
-                        let s = self.records_cell_text(&layout, ri, ci);
-                        let w = s.width() as u16;
-                        if w > *wref {
-                            *wref = w;
-                        }
-                    }
-                }
-            } else {
-                // Pivot mode: measure formatted cell values
-                for ri in 0..layout.row_count() {
-                    for (ci, wref) in widths.iter_mut().enumerate().take(n) {
-                        if let Some(key) = layout.cell_key(ri, ci) {
-                            let value =
-                                self.model.evaluate_aggregated(&key, &layout.none_cats);
-                            let s = format_value(value.as_ref(), fmt_comma, fmt_decimals);
-                            let w = s.width() as u16;
-                            if w > *wref {
-                                *wref = w;
-                            }
-                        }
-                    }
-                }
-            }
-            // +1 for gap between columns
-            widths
-                .into_iter()
-                .map(|w| (w + 1).max(MIN_COL_WIDTH).min(MAX_COL_WIDTH))
-                .collect()
-        };
 
         // ── Adaptive row header widths ───────────────────────────────
-        // Measure the widest label at each row-header level.
         let data_row_items: Vec<&Vec<String>> = layout
             .row_items
             .iter()
@@ -410,23 +351,15 @@ impl<'a> GridWidget<'a> {
                         }
                         let cw = col_w_at(ci) as usize;
 
-                        let (cell_str, value) = if layout.is_records_mode() {
+                        // Check pending drill edits first, then use display_text
-                            let s = self.records_cell_text(&layout, ri, ci);
+                        let cell_str = if let Some(ds) = self.drill_state {
-                            // In records mode the value is a string, not aggregated
+                            let col_name = layout.col_label(ci);
-                            let v = if !s.is_empty() {
+                            ds.pending_edits
-                                Some(crate::model::cell::CellValue::Text(s.clone()))
+                                .get(&(ri, col_name))
-                            } else {
+                                .cloned()
-                                None
+                                .unwrap_or_else(|| layout.display_text(self.model, ri, ci, fmt_comma, fmt_decimals))
-                            };
-                            (s, v)
                         } else {
-                            let key = match layout.cell_key(ri, ci) {
+                            layout.display_text(self.model, ri, ci, fmt_comma, fmt_decimals)
-                                Some(k) => k,
-                                None => continue,
-                            };
-                            let value = self.model.evaluate_aggregated(&key, &layout.none_cats);
-                            let s = format_value(value.as_ref(), fmt_comma, fmt_decimals);
-                            (s, value)
                         };
                         let is_selected = ri == sel_row && ci == sel_col;
                         let is_search_match = !self.search_query.is_empty()
@@ -453,13 +386,13 @@ impl<'a> GridWidget<'a> {
                         } else if is_search_match {
                             Style::default().fg(Color::Black).bg(Color::Yellow)
                         } else if is_sel_row {
-                            let fg = if value.is_none() {
+                            let fg = if cell_str.is_empty() {
                                 Color::DarkGray
                             } else {
                                 Color::White
                             };
                             Style::default().fg(fg).bg(ROW_HIGHLIGHT_BG)
-                        } else if value.is_none() {
+                        } else if cell_str.is_empty() {
                             Style::default().fg(Color::DarkGray)
                         } else {
                             Style::default()
@@ -588,53 +521,111 @@ impl<'a> Widget for GridWidget<'a> {
     }
 }
 
-fn format_value(v: Option<&CellValue>, comma: bool, decimals: u8) -> String {
+/// Compute adaptive column widths for pivot mode (header labels + cell values).
-    match v {
+/// Header widths use the widest *individual* level label (not the joined
-        Some(CellValue::Number(n)) => format_f64(*n, comma, decimals),
+/// multi-level string), matching how the grid renderer draws each level on
-        Some(CellValue::Text(s)) => s.clone(),
+/// its own row with repeat-suppression.
-        None => String::new(),
+pub fn compute_col_widths(model: &Model, layout: &GridLayout, fmt_comma: bool, fmt_decimals: u8) -> Vec<u16> {
-    }
+    let n = layout.col_count();
-}
+    let mut widths = vec![0u16; n];
-
+    // Measure individual header level labels
-pub fn parse_number_format(fmt: &str) -> (bool, u8) {
+    let data_col_items: Vec<&Vec<String>> = layout
-    let comma = fmt.contains(',');
+        .col_items
-    let decimals = fmt
+        .iter()
-        .rfind('.')
+        .filter_map(|e| {
-        .and_then(|i| fmt[i + 1..].parse::<u8>().ok())
+            if let AxisEntry::DataItem(v) = e {
-        .unwrap_or(0);
+                Some(v)
-    (comma, decimals)
+            } else {
-}
+                None
-
+            }
-pub fn format_f64(n: f64, comma: bool, decimals: u8) -> String {
+        })
-    let formatted = format!("{:.prec$}", n, prec = decimals as usize);
+        .collect();
-    if !comma {
+    for (ci, wref) in widths.iter_mut().enumerate().take(n) {
-        return formatted;
+        if let Some(levels) = data_col_items.get(ci) {
-    }
+            let max_level_w = levels.iter().map(|s| s.width() as u16).max().unwrap_or(0);
-    // Split integer and decimal parts
+            if max_level_w > *wref {
-    let (int_part, dec_part) = if let Some(dot) = formatted.find('.') {
+                *wref = max_level_w;
-        (&formatted[..dot], Some(&formatted[dot..]))
+            }
-    } else {
-        (&formatted[..], None)
-    };
-    let is_neg = int_part.starts_with('-');
-    let digits = if is_neg { &int_part[1..] } else { int_part };
-    let mut result = String::new();
-    for (idx, c) in digits.chars().rev().enumerate() {
-        if idx > 0 && idx % 3 == 0 {
-            result.push(',');
         }
-        result.push(c);
     }
-    if is_neg {
+    // Measure cell content widths (works for both pivot and records modes)
-        result.push('-');
+    for ri in 0..layout.row_count() {
+        for (ci, wref) in widths.iter_mut().enumerate().take(n) {
+            let s = layout.display_text(model, ri, ci, fmt_comma, fmt_decimals);
+            let w = s.width() as u16;
+            if w > *wref {
+                *wref = w;
+            }
+        }
     }
-    let mut out: String = result.chars().rev().collect();
+    // Measure total row (column sums) — pivot mode only
-    if let Some(dec) = dec_part {
+    if !layout.is_records_mode() && layout.row_count() > 0 {
-        out.push_str(dec);
+        for (ci, wref) in widths.iter_mut().enumerate().take(n) {
+            let total: f64 = (0..layout.row_count())
+                .filter_map(|ri| layout.cell_key(ri, ci))
+                .map(|key| model.evaluate_aggregated_f64(&key, &layout.none_cats))
+                .sum();
+            let s = format_f64(total, fmt_comma, fmt_decimals);
+            let w = s.width() as u16;
+            if w > *wref {
+                *wref = w;
+            }
+        }
     }
-    out
+    widths
+        .into_iter()
+        .map(|w| (w + 1).max(MIN_COL_WIDTH).min(MAX_COL_WIDTH))
+        .collect()
 }
 
+/// Compute the total row header width from the layout's row items.
+pub fn compute_row_header_width(layout: &GridLayout) -> u16 {
+    let n_row_levels = layout.row_cats.len().max(1);
+    let data_row_items: Vec<&Vec<String>> = layout
+        .row_items
+        .iter()
+        .filter_map(|e| {
+            if let AxisEntry::DataItem(v) = e {
+                Some(v)
+            } else {
+                None
+            }
+        })
+        .collect();
+    let sub_widths: Vec<u16> = (0..n_row_levels)
+        .map(|d| {
+            let max_label = data_row_items
+                .iter()
+                .filter_map(|v| v.get(d))
+                .map(|s| s.width() as u16)
+                .max()
+                .unwrap_or(0);
+            (max_label + 1).max(MIN_ROW_HEADER_W).min(MAX_ROW_HEADER_W)
+        })
+        .collect();
+    sub_widths.iter().sum()
+}
+
+/// Count how many columns fit starting from `col_offset` given the available width.
+pub fn compute_visible_cols(col_widths: &[u16], row_header_width: u16, term_width: u16, col_offset: usize) -> usize {
+    // Account for grid border (2 chars)
+    let data_area_width = term_width.saturating_sub(2).saturating_sub(row_header_width);
+    let mut acc = 0u16;
+    let mut count = 0usize;
+    for ci in col_offset..col_widths.len() {
+        let w = col_widths[ci];
+        if acc + w > data_area_width {
+            break;
+        }
+        acc += w;
+        count += 1;
+    }
+    count.max(1)
+}
+
+// Re-export shared formatting functions
+pub use crate::format::{format_f64, parse_number_format};
+
 fn truncate(s: &str, max_width: usize) -> String {
     let w = s.width();
     if w <= max_width {
@@ -674,7 +665,8 @@ mod tests {
         let area = Rect::new(0, 0, width, height);
         let mut buf = Buffer::empty(area);
         let bufs = std::collections::HashMap::new();
-        GridWidget::new(model, &AppMode::Normal, "", &bufs, None).render(area, &mut buf);
+        let layout = GridLayout::new(model, model.active_view());
+        GridWidget::new(model, &layout, &AppMode::Normal, "", &bufs, None).render(area, &mut buf);
         buf
     }
 

src/ui/view_panel.rs

@@ -36,7 +36,7 @@ impl<'a> Widget for ViewPanel<'a> {
         let block = Block::default()
             .borders(Borders::ALL)
             .border_style(border_style)
-            .title(" Views [Enter] switch [n]ew [d]elete ");
+            .title(" Views ");
         let inner = block.inner(area);
         block.render(area, buf);
 

src/view/layout.rs

@@ -1,7 +1,17 @@
+use std::rc::Rc;
+
 use crate::model::cell::{CellKey, CellValue};
 use crate::model::Model;
 use crate::view::{Axis, View};
 
+/// Extract (record_index, dim_name) from a synthetic records-mode CellKey.
+/// Returns None for normal pivot-mode keys.
+pub fn synthetic_record_info(key: &CellKey) -> Option<(usize, String)> {
+    let idx: usize = key.get("_Index")?.parse().ok()?;
+    let dim = key.get("_Dim")?.to_string();
+    Some((idx, dim))
+}
+
 /// One entry on a grid axis: either a visual group header or a data-item tuple.
 ///
 /// `GroupHeader` entries are always visible so the user can see the group label
@@ -30,8 +40,8 @@ pub struct GridLayout {
     /// Categories on `Axis::None` — hidden, implicitly aggregated.
     pub none_cats: Vec<String>,
     /// In records mode: the filtered cell list, one per row.
-    /// None for normal pivot views.
+    /// None for normal pivot views. Rc for cheap sharing.
-    pub records: Option<Vec<(CellKey, CellValue)>>,
+    pub records: Option<Rc<Vec<(CellKey, CellValue)>>>,
 }
 
 impl GridLayout {
@@ -40,12 +50,11 @@ impl GridLayout {
     pub fn with_frozen_records(
         model: &Model,
         view: &View,
-        frozen_records: Option<Vec<(CellKey, CellValue)>>,
+        frozen_records: Option<Rc<Vec<(CellKey, CellValue)>>>,
     ) -> Self {
         let mut layout = Self::new(model, view);
         if layout.is_records_mode() {
             if let Some(records) = frozen_records {
-                // Re-build with the frozen records instead
                 let row_items: Vec<AxisEntry> = (0..records.len())
                     .map(|i| AxisEntry::DataItem(vec![i.to_string()]))
                     .collect();
@@ -175,7 +184,7 @@ impl GridLayout {
             row_items,
             col_items,
             none_cats,
-            records: Some(records),
+            records: Some(Rc::new(records)),
         }
     }
 
@@ -220,14 +229,10 @@ impl GridLayout {
         let mut has_value = vec![vec![false; cc]; rc];
         for ri in 0..rc {
             for ci in 0..cc {
-                has_value[ri][ci] = if self.is_records_mode() {
+                has_value[ri][ci] = self
-                    let s = self.records_display(ri, ci).unwrap_or_default();
+                    .cell_key(ri, ci)
-                    !s.is_empty()
+                    .and_then(|k| model.evaluate_aggregated(&k, &self.none_cats))
-                } else {
+                    .is_some();
-                    self.cell_key(ri, ci)
-                        .and_then(|k| model.evaluate_aggregated(&k, &self.none_cats))
-                        .is_some()
-                };
             }
         }
 
@@ -297,7 +302,7 @@ impl GridLayout {
                 .map(|i| AxisEntry::DataItem(vec![i.to_string()]))
                 .collect();
             self.row_items = new_row_items;
-            self.records = Some(new_records);
+            self.records = Some(Rc::new(new_records));
         }
     }
 
@@ -352,18 +357,57 @@ impl GridLayout {
             .unwrap_or_default()
     }
 
+    /// Resolve the display string for a synthetic records-mode CellKey.
+    /// Returns None for non-synthetic (pivot) keys.
+    pub fn resolve_display(&self, key: &CellKey) -> Option<String> {
+        let (idx, dim) = synthetic_record_info(key)?;
+        let records = self.records.as_ref()?;
+        let (orig_key, value) = records.get(idx)?;
+        if dim == "Value" {
+            Some(value.to_string())
+        } else {
+            Some(orig_key.get(&dim).unwrap_or("").to_string())
+        }
+    }
+
+    /// Unified display text for a cell at (row, col). Handles both pivot and
+    /// records modes. In pivot mode, evaluates and formats the cell value.
+    /// In records mode, resolves via the frozen records snapshot.
+    pub fn display_text(
+        &self,
+        model: &Model,
+        row: usize,
+        col: usize,
+        fmt_comma: bool,
+        fmt_decimals: u8,
+    ) -> String {
+        if self.is_records_mode() {
+            self.records_display(row, col).unwrap_or_default()
+        } else {
+            self.cell_key(row, col)
+                .and_then(|key| model.evaluate_aggregated(&key, &self.none_cats))
+                .map(|v| crate::format::format_value(Some(&v), fmt_comma, fmt_decimals))
+                .unwrap_or_default()
+        }
+    }
+
     /// Build the CellKey for the data cell at (row, col), including the active
     /// page-axis filter. Returns None if row or col is out of bounds.
-    /// In records mode: returns the real underlying CellKey when the column
+    /// In records mode: returns a synthetic `(_Index, _Dim)` key for every column.
-    /// is "Value" (editable); returns None for coord columns (read-only).
     pub fn cell_key(&self, row: usize, col: usize) -> Option<CellKey> {
-        if let Some(records) = &self.records {
+        if self.records.is_some() {
-            // Records mode: only the Value column maps to a real, editable cell.
+            let records = self.records.as_ref().unwrap();
-            if self.col_label(col) == "Value" {
+            if row >= records.len() {
-                return records.get(row).map(|(k, _)| k.clone());
-            } else {
                 return None;
             }
+            let col_label = self.col_label(col);
+            if col_label.is_empty() {
+                return None;
+            }
+            return Some(CellKey::new(vec![
+                ("_Index".to_string(), row.to_string()),
+                ("_Dim".to_string(), col_label),
+            ]));
         }
         let row_item = self
             .row_items
@@ -527,7 +571,7 @@ fn cross_product(model: &Model, view: &View, cats: &[String]) -> Vec<AxisEntry>
 
 #[cfg(test)]
 mod tests {
-    use super::{AxisEntry, GridLayout};
+    use super::{synthetic_record_info, AxisEntry, GridLayout};
     use crate::model::cell::{CellKey, CellValue};
     use crate::model::Model;
     use crate::view::Axis;
@@ -592,40 +636,66 @@ mod tests {
     }
 
     #[test]
-    fn records_mode_cell_key_editable_for_value_column() {
+    fn records_mode_cell_key_returns_synthetic_for_all_columns() {
         let mut m = records_model();
         let v = m.active_view_mut();
         v.set_axis("_Index", Axis::Row);
         v.set_axis("_Dim", Axis::Column);
         let layout = GridLayout::new(&m, m.active_view());
         assert!(layout.is_records_mode());
-        // Find the "Value" column index
         let cols: Vec<String> = (0..layout.col_count()).map(|i| layout.col_label(i)).collect();
+        // All columns return synthetic keys
         let value_col = cols.iter().position(|c| c == "Value").unwrap();
-        // cell_key should be Some for Value column
+        let key = layout.cell_key(0, value_col).unwrap();
-        let key = layout.cell_key(0, value_col);
+        assert_eq!(key.get("_Index"), Some("0"));
-        assert!(key.is_some(), "Value column should be editable");
+        assert_eq!(key.get("_Dim"), Some("Value"));
-        // cell_key should be None for coord columns
+
         let region_col = cols.iter().position(|c| c == "Region").unwrap();
-        assert!(
+        let key = layout.cell_key(0, region_col).unwrap();
-            layout.cell_key(0, region_col).is_none(),
+        assert_eq!(key.get("_Index"), Some("0"));
-            "Region column should not be editable"
+        assert_eq!(key.get("_Dim"), Some("Region"));
-        );
     }
 
     #[test]
-    fn records_mode_cell_key_maps_to_real_cell() {
+    fn records_mode_resolve_display_returns_values() {
         let mut m = records_model();
         let v = m.active_view_mut();
         v.set_axis("_Index", Axis::Row);
         v.set_axis("_Dim", Axis::Column);
         let layout = GridLayout::new(&m, m.active_view());
         let cols: Vec<String> = (0..layout.col_count()).map(|i| layout.col_label(i)).collect();
+
+        // Value column resolves to the cell value
         let value_col = cols.iter().position(|c| c == "Value").unwrap();
-        // The CellKey at (0, Value) should look up a real cell value
         let key = layout.cell_key(0, value_col).unwrap();
-        let val = m.evaluate(&key);
+        let display = layout.resolve_display(&key);
-        assert!(val.is_some(), "cell_key should resolve to a real cell");
+        assert!(display.is_some(), "Value column should resolve");
+
+        // Category column resolves to the coordinate value
+        let region_col = cols.iter().position(|c| c == "Region").unwrap();
+        let key = layout.cell_key(0, region_col).unwrap();
+        let display = layout.resolve_display(&key).unwrap();
+        assert!(!display.is_empty(), "Region column should resolve to a value");
+    }
+
+    #[test]
+    fn synthetic_record_info_returns_none_for_pivot_keys() {
+        let key = CellKey::new(vec![
+            ("Region".to_string(), "East".to_string()),
+            ("Product".to_string(), "Shoes".to_string()),
+        ]);
+        assert!(synthetic_record_info(&key).is_none());
+    }
+
+    #[test]
+    fn synthetic_record_info_extracts_index_and_dim() {
+        let key = CellKey::new(vec![
+            ("_Index".to_string(), "3".to_string()),
+            ("_Dim".to_string(), "Region".to_string()),
+        ]);
+        let (idx, dim) = synthetic_record_info(&key).unwrap();
+        assert_eq!(idx, 3);
+        assert_eq!(dim, "Region");
     }
 
     fn coord(pairs: &[(&str, &str)]) -> CellKey {

src/view/mod.rs

@@ -3,5 +3,5 @@ pub mod layout;
 pub mod types;
 
 pub use axis::Axis;
-pub use layout::{AxisEntry, GridLayout};
+pub use layout::{synthetic_record_info, AxisEntry, GridLayout};
 pub use types::View;