feat(cmd): use new effects to improve command behavior

Update various commands to utilize the new AbortChain and CleanEmptyRecords
effects.

- CommitAndAdvance now pushes a mode change effect when aborting.
- ToggleRecordsMode now cleans up empty records upon exiting.
- EnterAdvance now emits AbortChain when at the bottom-right corner.

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

src/command/cmd/commit.rs

@@ -261,6 +261,16 @@ pub enum AdvanceDir {
     Right,
 }
 
+/// Return the normal-mode counterpart of an editing mode. Used by
+/// `CommitAndAdvance` to compute the mode to land in if the advance
+/// aborts (commit + exit editing at boundary).
+fn exit_mode_for(edit_mode: &AppMode) -> AppMode {
+    match edit_mode {
+        AppMode::RecordsEditing { .. } => AppMode::RecordsNormal,
+        _ => AppMode::Normal,
+    }
+}
+
 /// Commit a cell edit, advance the cursor, and re-enter edit mode.
 /// Subsumes the old `CommitCellEdit` (Down) and `CommitAndAdvanceRight` (Right).
 ///
@@ -286,6 +296,13 @@ impl Cmd for CommitAndAdvance {
     fn execute(&self, ctx: &CmdContext) -> Vec<Box<dyn Effect>> {
         let mut effects: Vec<Box<dyn Effect>> = Vec::new();
         commit_cell_value(ctx, &self.key, &self.value, &mut effects);
+        // Pre-emptively drop to the normal counterpart of edit_mode. If the
+        // advance succeeds, the trailing `EnterEditAtCursor` below will lift
+        // us back into editing on the new cell. If the advance aborts
+        // (e.g. already at bottom-right on Enter), `EnterEditAtCursor` is
+        // skipped and we land in normal mode — which is the desired
+        // "Enter at bottom-right commits and exits" behavior.
+        effects.push(effect::change_mode(exit_mode_for(&self.edit_mode)));
         match self.advance {
             AdvanceDir::Down => {
                 let adv = EnterAdvance {