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/command/cmd/mode.rs

@@ -197,13 +197,18 @@ impl Cmd for EnterEditMode {
     fn name(&self) -> &'static str {
         "enter-edit-mode"
     }
-    fn execute(&self, _ctx: &CmdContext) -> Vec<Box<dyn Effect>> {
+    fn execute(&self, ctx: &CmdContext) -> Vec<Box<dyn Effect>> {
+        let edit_mode = if ctx.mode.is_records() {
+            AppMode::records_editing()
+        } else {
+            AppMode::editing()
+        };
         vec![
             Box::new(effect::SetBuffer {
                 name: "edit".to_string(),
                 value: self.initial_value.clone(),
             }),
-            effect::change_mode(AppMode::editing()),
+            effect::change_mode(edit_mode),
         ]
     }
 }