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.

artifacts/api-server/src/routes/auth.ts

@@ -64,10 +64,13 @@ function buildAuthUser(
     isActive: user.isActive,
     notificationSoundOrder: user.notificationSoundOrder,
     notificationSoundMeeting: user.notificationSoundMeeting,
+    notificationSoundNote: user.notificationSoundNote,
     notifyOrdersEnabled: user.notifyOrdersEnabled,
     notifyMeetingsEnabled: user.notifyMeetingsEnabled,
+    notifyNotesEnabled: user.notifyNotesEnabled,
     vibrationEnabledOrder: user.vibrationEnabledOrder,
     vibrationEnabledMeeting: user.vibrationEnabledMeeting,
+    vibrationEnabledNote: user.vibrationEnabledNote,
     notificationsMuted: user.notificationsMuted,
     roles,
     groups,
@@ -435,10 +438,13 @@ router.patch("/auth/me/notification-preferences", requireAuth, async (req, res):
   for (const k of [
     "notificationSoundOrder",
     "notificationSoundMeeting",
+    "notificationSoundNote",
     "notifyOrdersEnabled",
     "notifyMeetingsEnabled",
+    "notifyNotesEnabled",
     "vibrationEnabledOrder",
     "vibrationEnabledMeeting",
+    "vibrationEnabledNote",
     "notificationsMuted",
   ] as const) {
     if (parsed.data[k] !== undefined) updates[k] = parsed.data[k];