feat: Phase 6 - MCP + Webhooks + Worker + Polish

- MCP server: stateless JSON-RPC 2.0 with 18 tools (tasks, habits, projects, notes, domains, search, activity)
- Webhooks API: CRUD routes under /api/domains/[domainId]/webhooks/ with test endpoint and deliveries log
- Webhook delivery: HMAC-SHA256 signed POST with retry (exponential backoff, max 6)
- Worker rewrite: Drizzle ORM instead of PocketBase, polls jobs table, handles webhook_delivery, recurring_spawn, ai_dispatch
- Rate limiting: token bucket per IP/API key (100 req/min REST, 300 req/min MCP)
- Keyboard help overlay: ? opens Radix Dialog with search/filter, Esc closes
- AI @mention stub: @agent in command palette dispatches CustomEvent
- Mobile responsive: bottom nav, single-column kanban, day view calendar, 44px touch targets
- Accessibility: skip-to-content link, focus rings, aria-labels, color contrast
- E2E tests: mcp.spec.ts, webhooks.spec.ts, realtime.spec.ts added
- Schema: api_keys and webhook_deliveries tables with migration
- Removed old PocketBase-style database.ts from worker

e2e/search.spec.ts

@@ -0,0 +1,22 @@
+import { test, expect } from '@playwright/test';
+import { login } from './helpers/auth';
+
+test.describe('Search', () => {
+  test.beforeEach(async ({ page }) => {
+    await login(page);
+  });
+
+  test('should display search page with search input', async ({ page }) => {
+    await page.goto('/search');
+    await expect(page.getByRole('heading', { name: /search/i })).toBeVisible();
+    await expect(page.getByPlaceholder(/search/i).first()).toBeVisible();
+  });
+
+  test('should perform search and show results', async ({ page }) => {
+    await page.goto('/search');
+    const searchInput = page.getByPlaceholder(/search/i).first();
+    await searchInput.fill('test');
+    // Wait for results
+    await page.waitForTimeout(1000);
+  });
+});