Clean up TUI package and refactor component structure

- Remove old TUI implementation and components (LoadingAnimation, MarkdownComponent, TextComponent, TextEditor, WhitespaceComponent)
- Rename components-new to components with new API (Loader, Markdown, Text, Editor, Spacer)
- Move Text and Input components to separate files in src/components/
- Add render caching to Text component (similar to Markdown)
- Add proper ANSI code handling in Text component using stripVTControlCharacters
- Update coding-agent to use new TUI API (requires ProcessTerminal, uses custom Editor subclass for key handling)
- Remove old test files, keep only chat-simple.ts and virtual-terminal.ts
- Update README.md with new minimal API documentation
- Switch from tsc to tsgo for type checking
- Update package dependencies across monorepo

packages/tui/src/components/loader.ts

@@ -0,0 +1,50 @@
+import chalk from "chalk";
+import type { TUI } from "../tui.js";
+import { Text } from "./text.js";
+
+/**
+ * Loader component that updates every 80ms with spinning animation
+ */
+export class Loader extends Text {
+	private frames = ["⠋", "⠙", "⠹", "⠸", "⠼", "⠴", "⠦", "⠧", "⠇", "⠏"];
+	private currentFrame = 0;
+	private intervalId: NodeJS.Timeout | null = null;
+	private ui: TUI | null = null;
+
+	constructor(
+		ui: TUI,
+		private message: string = "Loading...",
+	) {
+		super("");
+		this.ui = ui;
+		this.start();
+	}
+
+	start() {
+		this.updateDisplay();
+		this.intervalId = setInterval(() => {
+			this.currentFrame = (this.currentFrame + 1) % this.frames.length;
+			this.updateDisplay();
+		}, 80);
+	}
+
+	stop() {
+		if (this.intervalId) {
+			clearInterval(this.intervalId);
+			this.intervalId = null;
+		}
+	}
+
+	setMessage(message: string) {
+		this.message = message;
+		this.updateDisplay();
+	}
+
+	private updateDisplay() {
+		const frame = this.frames[this.currentFrame];
+		this.setText(`${chalk.cyan(frame)} ${chalk.dim(this.message)}`);
+		if (this.ui) {
+			this.ui.requestRender();
+		}
+	}
+}