feat(records): implement records mode for data entry

Implement a new "Records" mode for data entry.
- Add `RecordsNormal` and `RecordsEditing` to `AppMode` and `ModeKey` .
- `DataStore` now uses `IndexMap` and supports `sort_by_key()` to ensure
  deterministic row order.
- `ToggleRecordsMode` command now sorts data and switches to
  `RecordsNormal` .
- `EnterEditMode` command now respects records editing variants.
- `RecordsNormal` mode includes a new `o` keybinding to add a record row.
- `RecordsEditing` mode inherits from `Editing` and adds an `Esc` binding
  to return to `RecordsNormal` .
- Added `SortData` effect to trigger data sorting.
- Updated UI to display "RECORDS" and "RECORDS INSERT" mode names and
  styles.
- Updated keymaps, command registry, and view navigation to support these
  new modes.
- Added comprehensive tests for records mode behavior, including sorting
  and boundary conditions for Tab/Enter.

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

src/ui/effect.rs

@@ -59,6 +59,14 @@ impl Effect for AddItemInGroup {
     }
 }
 
+#[derive(Debug)]
+pub struct SortData;
+impl Effect for SortData {
+    fn apply(&self, app: &mut App) {
+        app.model.data.sort_by_key();
+    }
+}
+
 #[derive(Debug)]
 pub struct SetCell(pub CellKey, pub CellValue);
 impl Effect for SetCell {
@@ -127,7 +135,11 @@ impl Effect for EnterEditAtCursor {
         let value = ctx.display_value.clone();
         drop(ctx);
         app.buffers.insert("edit".to_string(), value);
-        app.mode = AppMode::editing();
+        app.mode = if app.mode.is_records() {
+            AppMode::records_editing()
+        } else {
+            AppMode::editing()
+        };
     }
 }