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/grid.rs

@@ -132,7 +132,10 @@ mod tests {
         let mut m = Workbook::new("Test");
         m.add_category("Region").unwrap();
         m.model.category_mut("Region").unwrap().add_item("East");
-        m.model.category_mut("_Measure").unwrap().add_item("Revenue");
+        m.model
+            .category_mut("_Measure")
+            .unwrap()
+            .add_item("Revenue");
         m.model.category_mut("_Measure").unwrap().add_item("Cost");
         m.model.set_cell(
             CellKey::new(vec![
@@ -148,7 +151,8 @@ mod tests {
             ]),
             CellValue::Number(600.0),
         );
-        m.model.add_formula(parse_formula("Profit = Revenue - Cost", "_Measure").unwrap());
+        m.model
+            .add_formula(parse_formula("Profit = Revenue - Cost", "_Measure").unwrap());
 
         let layout = make_layout(&m);
         let reg = make_registry();
@@ -408,8 +412,15 @@ impl Cmd for ToggleRecordsMode {
         let is_records = ctx.layout.is_records_mode();
 
         if is_records {
-            // Navigate back to the previous view (restores original axes)
-            return vec![Box::new(effect::ViewBack), effect::set_status("Pivot mode")];
+            // Leaving records mode: clean up any records with empty CellKeys
+            // (produced by AddRecordRow when no page filters are set) before
+            // restoring the previous view. This is the inverse of `SortData`
+            // that runs on entry.
+            return vec![
+                Box::new(effect::CleanEmptyRecords),
+                Box::new(effect::ViewBack),
+                effect::set_status("Pivot mode"),
+            ];
         }
 
         let mut effects: Vec<Box<dyn Effect>> = Vec::new();