WIP: Large refactor checkpoint

- Refactored daemon client and RPC layer
- Added new client package structure in server
- Removed legacy hooks (use-daemon-request, use-session-rpc, use-websocket)
- Added use-daemon-client hook
- Added e2e test infrastructure with Playwright
- Updated agent providers and session handling
- Removed codex-sdk patches

packages/app/playwright.config.ts

@@ -0,0 +1,26 @@
+import { defineConfig, devices } from '@playwright/test';
+
+const baseURL = process.env.E2E_BASE_URL ?? 'http://localhost:8081';
+
+export default defineConfig({
+  testDir: './e2e',
+  timeout: 60_000,
+  expect: {
+    timeout: 10_000,
+  },
+  fullyParallel: true,
+  retries: process.env.CI ? 1 : 0,
+  reporter: [['list']],
+  use: {
+    baseURL,
+    trace: 'retain-on-failure',
+    screenshot: 'only-on-failure',
+    video: 'retain-on-failure',
+  },
+  projects: [
+    {
+      name: 'Desktop Chrome',
+      use: { ...devices['Desktop Chrome'] },
+    },
+  ],
+});