Toolbar & chrome
General adapter chrome — toolbar, settings sheet, shortcuts.

These are the general adapter controls that host everything else — the toolbar itself
(showToolbar), the runtime settings sheet (showSettings) where end-users flip features
without developer wiring, and the keyboard-shortcuts overlay (showShortcuts). They're chrome, so
they live in the adapters (@bloomskill/table-mui, @bloomskill/table-shadcn), not the engine.
| Feature | Flag | Default |
|---|---|---|
| Runtime settings sheet | showSettings | false |
| Keyboard-shortcuts overlay | showShortcuts | false |
| Toolbar (whole) | showToolbar | true |