fix: low-tail correctness — thread notifs, call audio, OIDC expiry

Verify-then-fix batch of minor bugs; each staged diff reviewed by 2 agents
(both SHIP). Two listed items (N6 receipt-avatar refresh, H10 room-name
length reject) were already handled and left unchanged.

Threads:
- T5: a just-sent reply no longer under-notifies — `participated` also checks
  the local thread timeline for our own events, since the server-bundle
  `hasCurrentUserParticipated` lags.
- T6: a room set to "Mentions & Keywords only" no longer over-notifies Default
  thread replies — new `roomMentionsOnly` gate (behavior-identical when false;
  +4 unit tests).
- T7: thread-mode account-data writes are serialized with content carried
  forward (setAccountData is a bare PUT whose result lags the /sync echo, so
  plain serialization wouldn't stop the lost update); carry only on success.

Calls / audio:
- C-L2: a real incoming ring cancels a lingering Settings ringtone preview.
- C-L3: the ringtone AudioContext is primed on the first page gesture (via the
  always-mounted CallEmbedProvider) so the first ring after a cold load isn't
  silent.
- C-L5: useCallSpeakers depends on a stable boolean, so the tile MutationObserver
  + io.lotus.call_state subscription aren't rebuilt on every membership change.

Crypto:
- F5: the OIDC refresher forwards the freshly-refreshed token expiry
  (passed on the tokens object at runtime) as expiresInMs, so the persisted
  expiresAt no longer goes stale across reloads.

Gates: tsc 0, eslint 0, prettier clean, 860/860 tests, build ok.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/app/utils/threadNotifications.test.ts

@@ -23,6 +23,7 @@ const decide = (
     highlight: false,
     notify: false,
     roomMuted: false,
+    roomMentionsOnly: false,
     ...overrides,
   });
 
@@ -53,6 +54,25 @@ describe('shouldNotifyThreadReply', () => {
     assert.equal(decide({ mode: ThreadNotificationMode.All, highlight: false }), 'notify');
   });
 
+  it('roomMentionsOnly: Default + participating + participated but no highlight => none', () => {
+    assert.equal(decide({ roomMentionsOnly: true, participated: true }), 'none');
+  });
+
+  it('roomMentionsOnly: Default + highlight still notifies loudly', () => {
+    assert.equal(decide({ roomMentionsOnly: true, highlight: true }), 'loud');
+  });
+
+  it('roomMentionsOnly does NOT suppress an explicit All override', () => {
+    assert.equal(
+      decide({ roomMentionsOnly: true, mode: ThreadNotificationMode.All, highlight: false }),
+      'notify',
+    );
+  });
+
+  it('roomMentionsOnly: Default + defaultBehavior all + no highlight => none', () => {
+    assert.equal(decide({ roomMentionsOnly: true, defaultBehavior: 'all' }), 'none');
+  });
+
   it('mode MentionsOnly + highlight => loud', () => {
     assert.equal(decide({ mode: ThreadNotificationMode.MentionsOnly, highlight: true }), 'loud');
   });