🎉 Initial commit: PiAgentUI — AI Agent Desktop & Web UI

A professional workspace for AI coding agents with:
- Real-time streaming chat with SSE
- Session management (fork, clone, tree navigation)
- MCP tools browser & metadata panel
- Skills browser (global, project, package sources)
- Voice input & STT provider configuration
- Integrated terminal & file explorer
- Model selector with capability metadata
- Keyboard-first UI with command palette
- 8 languages (en, pt-BR, es, ja, zh-CN, ar, bn, hi)
- Tauri 2 desktop app
- React 19 + TypeScript + Vite 8 + Tailwind CSS 4
- Pi Agent extension runtime

Originally forked from OpenCodeUI, now an independent project.
License: GPL-3.0-only

src/api/piClient.test.ts

@@ -0,0 +1,51 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest'
+import { piClient } from './piClient'
+import { serverStore } from '../store/serverStore'
+
+describe('piClient Authenticated Fetch Client', () => {
+  beforeEach(() => {
+    vi.restoreAllMocks()
+    vi.resetModules()
+    localStorage.clear()
+    sessionStorage.clear()
+  })
+
+  it('builds headers with Bearer token if running in Pi Mode', async () => {
+    vi.spyOn(serverStore, 'isPiMode').mockReturnValue(true)
+    vi.spyOn(serverStore, 'getActiveToken').mockReturnValue('my-test-bearer-token')
+    vi.spyOn(serverStore, 'getActiveBaseUrl').mockReturnValue('http://127.0.0.1:4000')
+
+    const fetchSpy = vi
+      .spyOn(globalThis, 'fetch')
+      .mockImplementation(() => Promise.resolve(new Response(JSON.stringify({ ok: true }))))
+
+    const result = await piClient.get<{ ok: boolean }>('/api/test')
+    expect(result.ok).toBe(true)
+
+    expect(fetchSpy).toHaveBeenCalledWith(
+      'http://127.0.0.1:4000/api/test',
+      expect.objectContaining({
+        headers: expect.objectContaining({
+          Authorization: 'Bearer my-test-bearer-token',
+          'Content-Type': 'application/json',
+        }),
+      }),
+    )
+  })
+
+  it('throws backend JSON error messages instead of generic HTTP status text', async () => {
+    vi.spyOn(serverStore, 'getActiveToken').mockReturnValue('my-test-bearer-token')
+    vi.spyOn(serverStore, 'getActiveBaseUrl').mockReturnValue('http://127.0.0.1:4000')
+    vi.spyOn(globalThis, 'fetch').mockImplementation(() =>
+      Promise.resolve(
+        new Response(JSON.stringify({ error: 'fatal: not a git repository' }), {
+          status: 400,
+          statusText: 'Bad Request',
+          headers: { 'Content-Type': 'application/json' },
+        }),
+      ),
+    )
+
+    await expect(piClient.get('/api/vcs/status')).rejects.toThrow('fatal: not a git repository')
+  })
+})