Improve tool execution rendering and error handling

- Show tool execution components immediately when tool calls appear in streaming
- Update components with streaming arguments as they come in
- Handle incomplete/partial arguments gracefully with optional chaining
- Fix error handling: tools now throw exceptions instead of returning error messages
- Fix bash abort handling to properly reject on abort/timeout
- Clean up error display

packages/tui/src/components/loader.ts

@@ -15,11 +15,15 @@ export class Loader extends Text {
 		ui: TUI,
 		private message: string = "Loading...",
 	) {
-		super("");
+		super("", 1, 0);
 		this.ui = ui;
 		this.start();
 	}
 
+	render(width: number): string[] {
+		return ["", ...super.render(width)];
+	}
+
 	start() {
 		this.updateDisplay();
 		this.intervalId = setInterval(() => {