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>

.gitignore

@@ -12,6 +12,14 @@
 
 # testing
 /coverage
+/playwright/.auth/
+/tests/playwright/.auth/
+/tests/playwright-report/
+/tests/test-results/
+/playwright-report/
+/test-results/
+/tests/cypress/videos/
+/tests/cypress/screenshots/
 
 # next.js
 /.next/