feat: add minimal TUI with readline interface

src/frontends/tui/minimal.test.ts

@@ -0,0 +1,46 @@
+import { describe, it, expect, vi } from 'vitest';
+import { formatPrompt, parseCommand, type TuiCommand } from './minimal.js';
+
+describe('formatPrompt', () => {
+  it('formats default prompt', () => {
+    const prompt = formatPrompt('default');
+    expect(prompt).toBe('flynn> ');
+  });
+
+  it('formats thinking prompt', () => {
+    const prompt = formatPrompt('thinking');
+    expect(prompt).toContain('...');
+  });
+});
+
+describe('parseCommand', () => {
+  it('parses /quit command', () => {
+    const result = parseCommand('/quit');
+    expect(result).toEqual({ type: 'quit' });
+  });
+
+  it('parses /reset command', () => {
+    const result = parseCommand('/reset');
+    expect(result).toEqual({ type: 'reset' });
+  });
+
+  it('parses /transfer command with target', () => {
+    const result = parseCommand('/transfer telegram');
+    expect(result).toEqual({ type: 'transfer', target: 'telegram' });
+  });
+
+  it('parses /fullscreen command', () => {
+    const result = parseCommand('/fullscreen');
+    expect(result).toEqual({ type: 'fullscreen' });
+  });
+
+  it('parses regular message', () => {
+    const result = parseCommand('Hello, Flynn!');
+    expect(result).toEqual({ type: 'message', content: 'Hello, Flynn!' });
+  });
+
+  it('returns null for empty input', () => {
+    const result = parseCommand('');
+    expect(result).toBeNull();
+  });
+});