fix(desktop): extend local API timeout (#773)

Tested: cd desktop && bun run test -- src/api/client.test.ts
Tested: cd desktop && bun run lint
Confidence: high
Scope-risk: narrow

desktop/src/api/client.test.ts

@@ -10,6 +10,7 @@ import {
 
 describe('api diagnostics reporting', () => {
   afterEach(() => {
+    vi.useRealTimers()
     setAuthToken(null)
     setBaseUrl(getDefaultBaseUrl())
     vi.restoreAllMocks()
@@ -114,6 +115,36 @@ describe('api diagnostics reporting', () => {
     expect(fetchMock).toHaveBeenCalledTimes(1)
   })
 
+  it('defaults local API requests to a 120 second timeout', async () => {
+    vi.useFakeTimers()
+    const fetchMock = vi.spyOn(globalThis, 'fetch')
+    fetchMock.mockImplementation((url: string | URL | Request, init?: RequestInit) => {
+      if (String(url).endsWith('/api/slow')) {
+        return new Promise<Response>((_, reject) => {
+          init?.signal?.addEventListener('abort', () => {
+            reject(new DOMException('The operation was aborted.', 'AbortError'))
+          })
+        })
+      }
+
+      return Promise.resolve(new Response(JSON.stringify({ ok: true }), {
+        status: 200,
+        headers: { 'Content-Type': 'application/json' },
+      }))
+    })
+
+    const request = expect(api.get('/api/slow')).rejects.toThrow('Request timed out after 120s')
+
+    await vi.advanceTimersByTimeAsync(120_000)
+    await request
+
+    expect(fetchMock).toHaveBeenCalledTimes(2)
+    const [, diagnosticInit] = fetchMock.mock.calls[1]!
+    const body = JSON.parse(String((diagnosticInit as RequestInit).body))
+    expect(body.type).toBe('client_api_request_failed')
+    expect(body.details.message).toBe('Request timed out after 120s')
+  })
+
   it('can report raw client exceptions', async () => {
     const fetchMock = vi.spyOn(globalThis, 'fetch')
     fetchMock.mockResolvedValueOnce(new Response(JSON.stringify({ ok: true }), {

desktop/src/api/client.ts

@@ -10,6 +10,7 @@ const DEFAULT_BASE_URL = ENV_BASE_URL || 'http://127.0.0.1:3456'
 let baseUrl = DEFAULT_BASE_URL
 let authToken: string | null = null
 const DIAGNOSTICS_PATH = '/api/diagnostics/events'
+const DEFAULT_REQUEST_TIMEOUT_MS = 120_000
 
 function getErrorMessage(status: number, body: unknown) {
   if (body && typeof body === 'object' && 'message' in body && typeof body.message === 'string') {
@@ -72,7 +73,7 @@ async function request<T>(method: string, path: string, body?: unknown, options?
   const headers = buildHeaders()
 
   const controller = new AbortController()
-  const timeoutMs = options?.timeout ?? 30_000
+  const timeoutMs = options?.timeout ?? DEFAULT_REQUEST_TIMEOUT_MS
   const timeout = setTimeout(() => controller.abort(), timeoutMs)
   try {
     const res = await fetch(url, {