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/keymap.rs

@@ -61,6 +61,8 @@ pub enum ModeKey {
     CommandMode,
     SearchMode,
     ImportWizard,
+    RecordsNormal,
+    RecordsEditing,
 }
 
 impl ModeKey {
@@ -80,6 +82,8 @@ impl ModeKey {
             AppMode::ExportPrompt { .. } => Some(ModeKey::ExportPrompt),
             AppMode::CommandMode { .. } => Some(ModeKey::CommandMode),
             AppMode::ImportWizard => Some(ModeKey::ImportWizard),
+            AppMode::RecordsNormal => Some(ModeKey::RecordsNormal),
+            AppMode::RecordsEditing { .. } => Some(ModeKey::RecordsEditing),
             _ => None,
         }
     }
@@ -450,14 +454,9 @@ impl KeymapSet {
         normal.bind(KeyCode::Char('z'), none, "toggle-group-under-cursor");
         normal.bind(KeyCode::Char('H'), none, "hide-selected-row-item");
 
-        // Drill into aggregated cell / view history / add row
+        // Drill into aggregated cell / view history
         normal.bind(KeyCode::Char('>'), none, "drill-into-cell");
         normal.bind(KeyCode::Char('<'), none, "view-back");
-        normal.bind_seq(
-            KeyCode::Char('o'),
-            none,
-            vec![("add-record-row", vec![]), ("enter-edit-at-cursor", vec![])],
-        );
 
         // Records mode toggle and prune toggle
         normal.bind(KeyCode::Char('R'), none, "toggle-records-mode");
@@ -484,7 +483,17 @@ impl KeymapSet {
         z_map.bind(KeyCode::Char('Z'), none, "wq");
         normal.bind_prefix(KeyCode::Char('Z'), none, Arc::new(z_map));
 
-        set.insert(ModeKey::Normal, Arc::new(normal));
+        let normal = Arc::new(normal);
+        set.insert(ModeKey::Normal, normal.clone());
+
+        // ── Records normal mode (inherits from normal) ────────────────────
+        let mut rn = Keymap::with_parent(normal);
+        rn.bind_seq(
+            KeyCode::Char('o'),
+            none,
+            vec![("add-record-row", vec![]), ("enter-edit-at-cursor", vec![])],
+        );
+        set.insert(ModeKey::RecordsNormal, Arc::new(rn));
 
         // ── Help mode ────────────────────────────────────────────────────
         let mut help = Keymap::new();
@@ -754,7 +763,20 @@ impl KeymapSet {
         );
         ed.bind_args(KeyCode::Backspace, none, "pop-char", vec!["edit".into()]);
         ed.bind_any_char("append-char", vec!["edit".into()]);
-        set.insert(ModeKey::Editing, Arc::new(ed));
+        let ed = Arc::new(ed);
+        set.insert(ModeKey::Editing, ed.clone());
+
+        // ── Records editing mode (inherits from editing) ──────────────────
+        let mut re = Keymap::with_parent(ed);
+        re.bind_seq(
+            KeyCode::Esc,
+            none,
+            vec![
+                ("clear-buffer", vec!["edit".into()]),
+                ("enter-mode", vec!["records-normal".into()]),
+            ],
+        );
+        set.insert(ModeKey::RecordsEditing, Arc::new(re));
 
         // ── Formula edit ─────────────────────────────────────────────────
         let mut fe = Keymap::new();
@@ -1106,6 +1128,8 @@ mod tests {
             ModeKey::CommandMode,
             ModeKey::SearchMode,
             ModeKey::ImportWizard,
+            ModeKey::RecordsNormal,
+            ModeKey::RecordsEditing,
         ];
         for mode in &expected_modes {
             assert!(