fix: Preserve cursor position after bulk edits in aggregate views

Add cursor position preservation to all bulk edit operations in
aggregate views, matching the UX of detail view edits.

Changes:
- Save cursor position before refresh in all bulk edit methods
- Restore cursor after refresh (bounded by new row count)
- Applies to:
  * Single group merchant edit
  * Multi-select group merchant edit
  * Single group category edit
  * Multi-select group category edit

Behavior:
- Cursor stays at same row number after edit
- If row count changes (groups consolidate), cursor bounded to valid range
- Minimizes user navigation disruption
- Consistent with detail view behavior

Note: Scroll position is automatically maintained by move_cursor() which
scrolls to keep cursor visible. Fine-grained scroll_y offset preservation
can be added later if needed.

All 744 tests passing.

Author: wesm

moneyflow/app.py

@@ -1032,6 +1032,10 @@ async def _bulk_edit_merchant_from_aggregate(self) -> None:
             )
 
             if new_merchant:
+                # Save cursor position before refresh
+                table = self.query_one("#data-table", DataTable)
+                saved_cursor_row = table.cursor_row
+
                 # Get all transactions for this merchant
                 filtered_df = self.state.get_filtered_df()
                 merchant_txns = self.data_manager.filter_by_merchant(filtered_df, merchant_name)
@@ -1043,6 +1047,11 @@ async def _bulk_edit_merchant_from_aggregate(self) -> None:
 
                 self._notify(NotificationHelper.edit_queued(count))
                 self.refresh_view()
+
+                # Try to restore cursor position
+                table = self.query_one("#data-table", DataTable)
+                if saved_cursor_row < table.row_count:
+                    table.move_cursor(row=saved_cursor_row)
         else:
             self.notify("Edit merchant only works from Merchant view", timeout=2)
 
@@ -1085,13 +1094,22 @@ async def _bulk_edit_merchant_from_selected_groups(self) -> None:
         )
 
         if new_merchant:
+            # Save cursor position before refresh
+            table = self.query_one("#data-table", DataTable)
+            saved_cursor_row = table.cursor_row
+
             # Queue edits for all transactions
             count = self.controller.queue_merchant_edits(all_txns, "multiple", new_merchant)
 
             self.state.clear_selection()
             self._notify(NotificationHelper.edit_queued(count))
             self.refresh_view()
 
+            # Try to restore cursor position
+            table = self.query_one("#data-table", DataTable)
+            if saved_cursor_row < table.row_count:
+                table.move_cursor(row=saved_cursor_row)
+
     async def _edit_merchant_detail(self) -> None:
         """Edit merchant in detail view."""
         if self.state.current_data is None:
@@ -1235,6 +1253,10 @@ async def _bulk_edit_category_from_aggregate(self) -> None:
         if not new_category_id or (current_category_id and new_category_id == current_category_id):
             return
 
+        # Save cursor position before refresh
+        table = self.query_one("#data-table", DataTable)
+        saved_cursor_row = table.cursor_row
+
         # Get all transactions for this merchant/category/group
         filtered_df = self.state.get_filtered_df()
         matching_txns = filter_func(filtered_df, field_name)
@@ -1250,6 +1272,11 @@ async def _bulk_edit_category_from_aggregate(self) -> None:
         )
         self.refresh_view()
 
+        # Try to restore cursor position
+        table = self.query_one("#data-table", DataTable)
+        if saved_cursor_row < table.row_count:
+            table.move_cursor(row=saved_cursor_row)
+
     async def _bulk_edit_category_from_selected_groups(self) -> None:
         """Edit category for all transactions in all selected groups."""
         # Determine which field we're grouping by
@@ -1288,6 +1315,10 @@ async def _bulk_edit_category_from_selected_groups(self) -> None:
         if not new_category_id:
             return
 
+        # Save cursor position before refresh
+        table = self.query_one("#data-table", DataTable)
+        saved_cursor_row = table.cursor_row
+
         # Queue edits for all transactions
         count = self.controller.queue_category_edits(all_txns, new_category_id)
 
@@ -1299,6 +1330,11 @@ async def _bulk_edit_category_from_selected_groups(self) -> None:
         )
         self.refresh_view()
 
+        # Try to restore cursor position
+        table = self.query_one("#data-table", DataTable)
+        if saved_cursor_row < table.row_count:
+            table.move_cursor(row=saved_cursor_row)
+
     async def _edit_category(self) -> None:
         """Show category selection and apply (for detail view)."""
         if self.state.current_data is None: