feat(mobile): haptic tick on PTT press/release and on reactions (#125)

utils/haptics.ts: tick('ptt-on' | 'ptt-off' | 'reaction') → 10/10/8 ms
navigator.vibrate, a no-op without the API (iOS), when the system prefers
reduced motion, or when the new Settings → Calls "Haptic Feedback" switch
(default on, only rendered where the API exists) is off. PTT is observed
once through pttActiveAtom so the keyboard, global-hotkey and on-screen
paths all tick; reactions tick where the reaction event is sent in the
room and thread timelines (quick bar, hover bar, sheet and emoji board
all funnel there).

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PPmy3tPq869XDW4njjVaKA

src/app/features/room/RoomTimeline.tsx

@@ -91,6 +91,7 @@ import {
   reactionOrEditEvent,
 } from '../../utils/room';
 import { getLastEditDiff } from '../../utils/editDiff';
+import { tick } from '../../utils/haptics';
 import { GroupCandidate, GroupPlan, planMediaGroups } from '../../utils/mediaGroups';
 import { MediaGroupGrid, RegroupChip } from './message/MediaGroupGrid';
 import { Lightbox, toLightboxItems } from './MediaGallery';
@@ -478,6 +479,7 @@ export function RoomTimeline({ room, eventId, roomInputRef, editor }: RoomTimeli
   // Read positions are computed once in Room.tsx and provided via ReadPositionsContext
   // so both RoomTimeline and ThreadTimeline consume the same value (Gitea #38).
   const [hideMembershipEvents] = useSetting(settingsAtom, 'hideMembershipEvents');
+  const [hapticFeedback] = useSetting(settingsAtom, 'hapticFeedback');
   // [Gitea #137] Re-render after "Show separately" (the Set itself is module-level).
   const [, setSeparatedTick] = useState(0);
   const [hideNickAvatarEvents] = useSetting(settingsAtom, 'hideNickAvatarEvents');
@@ -1157,13 +1159,14 @@ export function RoomTimeline({ room, eventId, roomInputRef, editor }: RoomTimeli
       const rShortcode =
         shortcode ||
         (reactions.find(eventWithShortcode)?.getContent().shortcode as string | undefined);
+      tick('reaction', hapticFeedback);
       mx.sendEvent(
         room.roomId,
         MessageEvent.Reaction as any,
         getReactionContent(targetEventId, key, rShortcode),
       );
     },
-    [mx, room],
+    [mx, room, hapticFeedback],
   );
   const handleEdit = useCallback(
     (editEvtId?: string) => {