perf: defer heavy modules and add performance baselines

Lazy-load Stripe and the chat reply animation, remove the unused Lottie runtime, and add repeatable bundle and Web Vitals baseline tooling.

package.json

@@ -21,6 +21,8 @@
     "test:e2e:ui": "playwright test --ui",
     "test:e2e:real": "E2E_REAL_BACKEND=1 PLAYWRIGHT_BASE_URL=${PLAYWRIGHT_BASE_URL:-https://frontend-test.banlv-ai.com} E2E_API_BASE_URL=${E2E_API_BASE_URL:-https://proapi.banlv-ai.com} playwright test --project=real-backend",
     "test:e2e:prod": "E2E_REAL_BACKEND=1 PLAYWRIGHT_BASE_URL=${PLAYWRIGHT_BASE_URL:-https://cozsweet.com} E2E_API_BASE_URL=${E2E_API_BASE_URL:-https://proapi.banlv-ai.com} playwright test --project=prod-smoke",
+    "perf:bundle": "next experimental-analyze --output && node scripts/performance/report-bundle.mjs",
+    "perf:vitals": "node scripts/performance/collect-web-vitals.mjs",
     "generate-barrels": "barrelsby --delete -c barrelsby.json"
   },
   "dependencies": {
@@ -33,7 +35,6 @@
     "classnames": "^2.5.1",
     "dexie": "^4.4.3",
     "esbuild": "^0.25.0",
-    "lottie-react": "^2.4.1",
     "lucide-react": "^1.18.0",
     "next": "16.2.7",
     "next-auth": "^4.24.14",