feat(command): add smart edit-or-drill for aggregated cells

Introduce EditOrDrill command that intelligently handles
editing based on cell type. When cursor is on an aggregated
pivot cell (categories on Axis::None, no records mode), it
drills into the cell. Otherwise, it enters edit mode with
the current displayed value.

The 'i' and 'a' keys now trigger edit-or-drill instead of
enter-edit-mode. Aggregated cells are styled in italic to
signal that drilling is required for editing.

Co-Authored-By: fiddlerwoaroof/git-smart-commit (unsloth/Qwen3.5-35B-A3B-GGUF:Q5_K_M)

src/command/cmd.rs

@@ -633,6 +633,40 @@ impl Cmd for EnterEditMode {
     }
 }
 
+/// Smart dispatch for i/a: if the cursor is on an aggregated pivot cell
+/// (categories on `Axis::None`, no records mode), drill into it instead of
+/// editing. Otherwise enter edit mode with the current displayed value.
+#[derive(Debug)]
+pub struct EditOrDrill;
+impl Cmd for EditOrDrill {
+    fn name(&self) -> &'static str {
+        "edit-or-drill"
+    }
+    fn execute(&self, ctx: &CmdContext) -> Vec<Box<dyn Effect>> {
+        let is_aggregated = ctx.records_col.is_none() && !ctx.none_cats.is_empty();
+        if is_aggregated {
+            let Some(key) = ctx.cell_key.clone() else {
+                return vec![effect::set_status(
+                    "cannot drill — no cell at cursor",
+                )];
+            };
+            return DrillIntoCell { key }.execute(ctx);
+        }
+        // Edit path: prefer records display value (includes pending edits),
+        // else the underlying cell's stored value.
+        let initial_value = if let Some(v) = &ctx.records_value {
+            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()
+        };
+        EnterEditMode { initial_value }.execute(ctx)
+    }
+}
+
 /// Typewriter-style advance: move down, wrap to top of next column at bottom.
 #[derive(Debug)]
 pub struct EnterAdvance {
@@ -2341,6 +2375,7 @@ pub fn default_registry() -> CmdRegistry {
             }))
         },
     );
+    r.register_nullary(|| Box::new(EditOrDrill));
     r.register_nullary(|| Box::new(EnterExportPrompt));
     r.register_nullary(|| Box::new(EnterFormulaEdit));
     r.register_nullary(|| Box::new(EnterTileSelect));

src/command/keymap.rs

@@ -331,9 +331,9 @@ impl KeymapSet {
         );
         normal.bind(KeyCode::Tab, none, "cycle-panel-focus");
 
-        // Editing entry
+        // Editing entry — i/a drill into aggregated cells, else edit
-        normal.bind(KeyCode::Char('i'), none, "enter-edit-mode");
+        normal.bind(KeyCode::Char('i'), none, "edit-or-drill");
-        normal.bind(KeyCode::Char('a'), none, "enter-edit-mode");
+        normal.bind(KeyCode::Char('a'), none, "edit-or-drill");
         normal.bind(KeyCode::Enter, none, "enter-advance");
         normal.bind(KeyCode::Char('e'), ctrl, "enter-export-prompt");
 

src/ui/grid.rs

@@ -402,7 +402,13 @@ impl<'a> GridWidget<'a> {
                                 .to_lowercase()
                                 .contains(&self.search_query.to_lowercase());
 
-                        let cell_style = if is_selected {
+                        // Aggregated cells (pivot view with hidden dims) are
+                        // not directly editable — shown in italic to signal
+                        // "drill to edit". Records mode cells are always
+                        // directly editable, as are plain pivot cells.
+                        let is_aggregated = !layout.is_records_mode()
+                            && !layout.none_cats.is_empty();
+                        let mut cell_style = if is_selected {
                             Style::default()
                                 .fg(Color::Black)
                                 .bg(Color::Cyan)
@@ -421,6 +427,9 @@ impl<'a> GridWidget<'a> {
                         } else {
                             Style::default()
                         };
+                        if is_aggregated {
+                            cell_style = cell_style.add_modifier(Modifier::ITALIC);
+                        }
 
                         buf.set_string(
                             x,