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>

lib/cortex/intent-labels.ts

@@ -25,6 +25,8 @@ export const INTENT_LABELS: Record<CortexIntent, string> = {
   intake_navigeer: 'Naar intake sectie',
   risico_query: 'Risicotaxatie',
   diagnose_query: 'Diagnoses',
+  // No Show casus
+  register_no_show: 'No Show registratie',
   unknown: 'Onbekend',
 };