refactor(app): simplify session directory with direct snapshots and add sessionReady state

Replace subscription-based session accessor pattern with direct snapshot updates in daemon connections context. Add sessionReady flag to connection state to track when initial agent list has been received. Auto-select first ready host in create agent modal. Migrate from app.json to app.config.js. Add android:release script and Playwright testing docs.

package.json

@@ -14,6 +14,7 @@
     "test": "npm run test --workspaces --if-present",
     "start": "npm run start --workspace=@paseo/server",
     "android": "npm run android --workspace=@paseo/app",
+    "android:release": "APP_VARIANT=production npm run android --workspace=@paseo/app -- --variant release",
     "ios": "npm run ios --workspace=@paseo/app",
     "web": "npm run web --workspace=@paseo/app",
     "postinstall": "patch-package"