style: cleanup formatting and code style across the project

Clean up formatting and code style across the project.

- Remove unnecessary whitespace and empty lines in `src/model/cell.rs` ,
  `src/model/types.rs` , and `src/draw.rs` .
- Reformat long lines and function calls in `src/command/cmd.rs` ,
  `src/ui/grid.rs` , and `src/ui/tile_bar.rs` for better readability.
- Consolidate imports and simplify expressions in `src/command/keymap.rs` and
  `src/ui/app.rs` .

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

src/ui/grid.rs

@@ -128,9 +128,7 @@ impl<'a> GridWidget<'a> {
             v
         };
         let col_x_at = |ci: usize| -> u16 {
-            area.x
-                + row_header_width
-                + col_x[ci].saturating_sub(col_x[col_offset])
+            area.x + row_header_width + col_x[ci].saturating_sub(col_x[col_offset])
         };
         let col_w_at = |ci: usize| -> u16 { *col_widths.get(ci).unwrap_or(&MIN_COL_WIDTH) };
 
@@ -181,7 +179,11 @@ impl<'a> GridWidget<'a> {
                 buf.set_string(
                     x,
                     y,
-                    format!("{:<width$}", truncate(&label, cw.saturating_sub(1)), width = cw),
+                    format!(
+                        "{:<width$}",
+                        truncate(&label, cw.saturating_sub(1)),
+                        width = cw
+                    ),
                     group_style,
                 );
             }
@@ -233,7 +235,11 @@ impl<'a> GridWidget<'a> {
                 buf.set_string(
                     x,
                     y,
-                    format!("{:>width$}", truncate(&label, cw.saturating_sub(1)), width = cw),
+                    format!(
+                        "{:>width$}",
+                        truncate(&label, cw.saturating_sub(1)),
+                        width = cw
+                    ),
                     styled,
                 );
             }
@@ -357,7 +363,9 @@ impl<'a> GridWidget<'a> {
                             ds.pending_edits
                                 .get(&(ri, col_name))
                                 .cloned()
-                                .unwrap_or_else(|| layout.display_text(self.model, ri, ci, fmt_comma, fmt_decimals))
+                                .unwrap_or_else(|| {
+                                    layout.display_text(self.model, ri, ci, fmt_comma, fmt_decimals)
+                                })
                         } else {
                             layout.display_text(self.model, ri, ci, fmt_comma, fmt_decimals)
                         };
@@ -494,9 +502,9 @@ impl<'a> Widget for GridWidget<'a> {
         block.render(area, buf);
 
         // Page axis bar
-        let layout = GridLayout::new(self.model, self.model.active_view());
-        if !layout.page_coords.is_empty() && inner.height > 0 {
-            let page_info: Vec<String> = layout
+        if !self.layout.page_coords.is_empty() && inner.height > 0 {
+            let page_info: Vec<String> = self
+                .layout
                 .page_coords
                 .iter()
                 .map(|(cat, sel)| format!("{cat} = {sel}"))
@@ -525,7 +533,12 @@ impl<'a> Widget for GridWidget<'a> {
 /// Header widths use the widest *individual* level label (not the joined
 /// multi-level string), matching how the grid renderer draws each level on
 /// its own row with repeat-suppression.
-pub fn compute_col_widths(model: &Model, layout: &GridLayout, fmt_comma: bool, fmt_decimals: u8) -> Vec<u16> {
+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
@@ -607,9 +620,16 @@ pub fn compute_row_header_width(layout: &GridLayout) -> u16 {
 }
 
 /// 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 {
+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 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() {
@@ -657,6 +677,7 @@ mod tests {
     use crate::model::cell::{CellKey, CellValue};
     use crate::model::Model;
     use crate::ui::app::AppMode;
+    use crate::view::GridLayout;
 
     // ── Helpers ───────────────────────────────────────────────────────────────
 
@@ -712,10 +733,7 @@ mod tests {
         // Fill every cell so nothing is pruned as empty.
         for t in ["Food", "Clothing"] {
             for mo in ["Jan", "Feb"] {
-                m.set_cell(
-                    coord(&[("Type", t), ("Month", mo)]),
-                    CellValue::Number(1.0),
-                );
+                m.set_cell(coord(&[("Type", t), ("Month", mo)]), CellValue::Number(1.0));
             }
         }
         m