feat(cortex): update chat/nudge flow, deepgram streaming and agenda form

Refines chat panel, nudge messages and artifact rendering, reworks
deepgram token/streaming handling, and adds test tooling deps
(playwright, cypress) to package.json.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

package.json

@@ -9,7 +9,15 @@
     "start": "next start",
     "lint": "eslint",
     "types:generate": "npx supabase gen types typescript --project-id dqugbrpwtisgyxscpefg > lib/supabase/types.ts",
-    "setup:auth-hook": "tsx scripts/setup-auth-hook.ts"
+    "setup:auth-hook": "tsx scripts/setup-auth-hook.ts",
+    "test:e2e": "playwright test",
+    "test:e2e:ui": "playwright test --ui",
+    "test:e2e:debug": "playwright test --debug",
+    "test:e2e:report": "playwright show-report tests/playwright-report",
+    "test:cypress": "cypress run",
+    "test:cypress:open": "cypress open",
+    "test:cypress:run": "cypress run --browser chrome",
+    "test:cypress:demo": "next build && next start & sleep 5 && cypress open"
   },
   "dependencies": {
     "@deepgram/sdk": "^4.11.2",
@@ -62,6 +70,7 @@
     "zustand": "^5.0.9"
   },
   "devDependencies": {
+    "@playwright/test": "^1.59.1",
     "@tailwindcss/postcss": "^4",
     "@types/mdx": "^2.0.13",
     "@types/node": "^20",
@@ -69,6 +78,7 @@
     "@types/react-dom": "^18",
     "@types/three": "^0.181.0",
     "autoprefixer": "^10.4.22",
+    "cypress": "^15.14.2",
     "dotenv": "^17.2.3",
     "eslint": "^8.57.1",
     "eslint-config-next": "14.2.18",