refactor(ui): use pre-computed layout in GridWidget

Refactor GridWidget and other UI components to use the pre-computed layout from
App instead of re-creating it on every render. This improves performance and
ensures consistency.

- Update GridWidget to take a reference to GridLayout
- Update GridWidget::new and render to use the provided layout
- Update App::cmd_context and other call sites to pass the layout
- Update tests to provide the layout to GridWidget

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

src/ui/grid.rs

@@ -22,6 +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>,
@@ -31,6 +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>,
@@ -38,6 +40,7 @@ impl<'a> GridWidget<'a> {
     ) -> Self {
         Self {
             model,
+            layout,
             mode,
             search_query,
             buffers,
@@ -47,9 +50,7 @@ impl<'a> GridWidget<'a> {
 
     fn render_grid(&self, area: Rect, buf: &mut Buffer) {
         let view = self.model.active_view();
-
-        let frozen = self.drill_state.map(|s| s.records.clone());
-        let layout = GridLayout::with_frozen_records(self.model, view, frozen);
+        let layout = self.layout;
         let (sel_row, sel_col) = view.selected;
         let row_offset = view.row_offset;
         let col_offset = view.col_offset;
@@ -664,7 +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
     }