feat(tui): enabled programmatic form submission via editor APIs

- Added a public `submit()` method to the `Editor` class to trigger form submission.
- Updated the `EditorComponent` interface to expose an optional `submit()` method.

packages/tui/src/editor-component.ts

@@ -29,6 +29,9 @@ export interface EditorComponent extends Component {
 	/** Called when user submits (e.g., Enter key) */
 	onSubmit?: (text: string) => void;
 
+	/** Programmatically trigger submission (optional, e.g. for voice submit). */
+	submit?(): void;
+
 	/** Called when text changes */
 	onChange?: (text: string) => void;