feat(ui): add auto_record_calendar to the settings contract

src/lib/api.ts

@@ -326,6 +326,9 @@ export interface AppSettings {
   // Days of history to import (both a manual Import click and pst_auto_sync);
   // null = full mailbox history.
   pst_import_range_days: number | null;
+  /** Auto-start recording when a calendar event begins while the app is open
+   * (opt-in, off by default). Armed as a one-shot UI timer — nothing polls. */
+  auto_record_calendar: boolean;
   audio_output_device: string | null;
   microphone_enabled: boolean;
   audio_input_device: string | null;