- Fix directory copy to use unique name (was using original name)
- Make select_by_name more robust: try exact, case-insensitive, path match
- Add fallback status message with F2 hint if auto-select fails
- Show "Pasted as 'name' - press F2 to rename" when select fails

- Add select_by_name() and start_rename_with_text() to Tab
- Add set_focused() to ListView, GridView, ColumnView
- Keep Both now pastes with suggested name (file-1.txt) and immediately
  starts inline rename so user can adjust the name
- Non-conflicting files paste first, then first conflict gets rename UI
- If "Apply to all" is checked, remaining conflicts auto-rename silently

- Add ConflictDialog with Replace/Skip/Keep Both/Cancel options
- Detect file conflicts before paste, show dialog with bell alert
- Handle conflicts: skip, replace existing, or auto-rename (Keep Both)
- Add scrollbar indicator to help modal
- Add scroll limit to prevent over-scrolling
- Add mouse wheel scroll support for help modal
- Add new keybinds to help: Bookmarks section, Shift+Up/Down, q to quit

- Add ProgressDialog component with progress bar and cancel button
- Add UndoStack for tracking file operations (copy, move, trash, rename, create folder)
- Track operations for undo: paste, trash, rename, create folder
- Implement undo() and redo() methods with reverse operations
- Add Ctrl+Z (undo) and Ctrl+Y (redo) keybindings
- Update help modal with undo/redo shortcuts
- Modify Tab.confirm_rename to return paths for undo tracking