fix: don't clear loading animation when Ctrl+C clears editor

- Remove statusContainer.clear() from clearEditor()
- Loading animation should only be removed when agent finishes
- Ctrl+C once should only clear editor text, not status

packages/coding-agent/src/tui/tui-renderer.ts

@@ -429,7 +429,6 @@ export class TuiRenderer {
 
 	clearEditor(): void {
 		this.editor.setText("");
-		this.statusContainer.clear();
 		this.ui.requestRender();
 	}