feat(notes): make incoming-note popup attention-grabbing

Task #409: incoming notes now mirror UpcomingMeetingAlert's attention model
so recipients can't miss them.

Changes:
- DB: add `notification_sound_note` (default "knock"), `notify_notes_enabled`,
  `vibration_enabled_note` to users schema; pushed via drizzle.
- API spec: add 3 new fields to AuthUser + UpdateNotificationPreferencesBody;
  regenerated codegen.
- Auth route: include new fields in buildAuthUser + PATCH allowlist.
- Socket hook: play notification sound + vibrate on `note_received`,
  gated by mute/notifyNotesEnabled/socket warmup, with playedNoteIdsRef
  dedupe (mirrors upcoming-meeting-alert playedRef).
- IncomingNotePopupContext: enqueue() now returns boolean acceptance so
  the socket hook can suppress sound on own-note/duplicate.
- Popup visual: z-[110], ring-4 amber, shadow-2xl, animate-in zoom,
  avatar animate-ping pulse.
- Settings UI: refactored to SLOT_KEYS map, added 3rd "Notes" slot tab
  (grid-cols-3) with enabled/vibration toggles + sound picker.
- Locales en/ar: added notifSettings.slot.note, notesEnabled, vibrationNote.

Pre-existing typecheck errors in executive-meetings.ts (font settings
scope) are unrelated to this task.

lib/api-client-react/src/generated/api.schemas.ts

@@ -113,10 +113,13 @@ export const NotificationSoundId = {
 export interface UpdateNotificationPreferencesBody {
   notificationSoundOrder?: NotificationSoundId;
   notificationSoundMeeting?: NotificationSoundId;
+  notificationSoundNote?: NotificationSoundId;
   notifyOrdersEnabled?: boolean;
   notifyMeetingsEnabled?: boolean;
+  notifyNotesEnabled?: boolean;
   vibrationEnabledOrder?: boolean;
   vibrationEnabledMeeting?: boolean;
+  vibrationEnabledNote?: boolean;
   notificationsMuted?: boolean;
 }
 
@@ -154,10 +157,13 @@ export interface AuthUser {
   isActive: boolean;
   notificationSoundOrder: NotificationSoundId;
   notificationSoundMeeting: NotificationSoundId;
+  notificationSoundNote: NotificationSoundId;
   notifyOrdersEnabled: boolean;
   notifyMeetingsEnabled: boolean;
+  notifyNotesEnabled: boolean;
   vibrationEnabledOrder: boolean;
   vibrationEnabledMeeting: boolean;
+  vibrationEnabledNote: boolean;
   notificationsMuted: boolean;
   roles: string[];
   groups: GroupSummary[];