feat(ui): let recording.start attach a calendar event id

src/lib/stores/recording.svelte.ts

@@ -66,7 +66,7 @@ class RecordingStore {
     });
   }
 
-  async start(title?: string, record = false, templateId?: string) {
+  async start(title?: string, record = false, templateId?: string, calendarEventId?: string) {
     this.segments = [];
     this.retention = record;
     this.deviceNotice = null;
@@ -75,7 +75,7 @@ class RecordingStore {
     // T8.7/FR-TRX-4: whatever language is currently configured in Settings
     // becomes this meeting's requested language, persisted on its record.
     const language = settings.settings.whisper_language ?? undefined;
-    this.meetingId = await api.startRecording(title, undefined, record, templateId, language);
+    this.meetingId = await api.startRecording(title, calendarEventId, record, templateId, language);
     this.state = "recording";
   }