fix(19): correct admin reset-password client URL (AUTH-LOCAL-08 blocker)

VERIFICATION.md found a cross-layer URL mismatch: fetchAdminResetPassword
POSTed to /api/admin/members/:id/reset-password but the API registers the
route as /api/admin/members/:id/password (admin.ts), so the Admin reset sheet
404'd on every submit. Confirmed live: old path -> 404, correct path -> 400
(route reached). Unit tests missed it because API tests hit the real path
directly and PWA tests mock the fetcher — no test crossed both layers.

Fix the client URL and add a URL-contract regression test that pins the exact
path (asserts fetch is called with /api/admin/members/:id/password).

PWA 266/266 (+1), typecheck clean.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

apps/pwa/src/api/client.test.ts

@@ -654,3 +654,33 @@ describe('calendarStore — delete/sync keys', () => {
     expect(state.lastSyncedUid).toBeNull();
   });
 });
+
+// ── Phase 19 (AUTH-LOCAL-08): admin reset-password URL contract ───────────────
+// Regression guard for the post-merge blocker: client.ts targeted
+// /members/:id/reset-password but the API registers /members/:id/password, so the
+// Admin reset sheet 404'd in production. Unit tests on both sides missed it (API
+// tests hit the real path directly; PWA tests mock the fetcher). Pin the exact URL.
+describe('fetchAdminResetPassword — URL contract (Phase 19, AUTH-LOCAL-08)', () => {
+  beforeEach(() => {
+    vi.stubGlobal('fetch', vi.fn());
+  });
+  afterEach(() => {
+    vi.unstubAllGlobals();
+  });
+
+  it('POSTs to /api/admin/members/:id/password (must match admin.ts route)', async () => {
+    vi.mocked(fetch).mockResolvedValueOnce({
+      ok: true,
+      type: 'basic',
+      status: 200,
+    } as unknown as Response);
+
+    const { fetchAdminResetPassword } = await import('./client.js');
+    await fetchAdminResetPassword(7, 'new-password-123');
+
+    expect(fetch).toHaveBeenCalledWith(
+      '/api/admin/members/7/password',
+      expect.objectContaining({ method: 'POST' }),
+    );
+  });
+});