fix(unread): stop stuck/resurrecting read indicators

handleReceipt recomputed unread from getUnreadNotificationCount, which is
server-computed and stale on the synchronous synthetic receipt echo (the SDK
only zeroes it immediately when the last event is our own message). Reading
someone else's message therefore PUT the stale non-zero count back -> dot stuck
or resurrected on the ack-sync ordering race. Restore upstream cinny's
optimistic DELETE on our own receipt; the UnreadNotifications listener re-asserts
the accurate badge on the server ack.

Also collapse a {total:0,highlight:0} PUT to a DELETE in the reducer (a present
map entry lights the dot via hasUnread=!!unread, so phantom {0,0} PUTs from the
UnreadNotifications listener left stuck dots).

Mark-as-Unread (MSC2867): clear the flag directly in markAsRead (opening an
already-read room sends no receipt, so the receipt-driven auto-clear never
fired), and gate the receipt auto-clear to main/unthreaded receipts so reading
one thread no longer wipes the whole-room flag.

Tests: 700/700 pass; typecheck + prod build clean.

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

src/app/utils/notifications.ts

@@ -1,11 +1,19 @@
 import { MatrixClient, NotificationCountType, ReceiptType } from 'matrix-js-sdk';
 import { getSettings } from '../state/settings';
+import { readMarkedUnread, setMarkedUnread } from '../state/room/markedUnread';
 
 export async function markAsRead(mx: MatrixClient, roomId: string, privateReceipt: boolean) {
   const { privateReadReceipts } = getSettings();
   const room = mx.getRoom(roomId);
   if (!room) return;
 
+  // Reading a room clears an explicit "mark as unread" (MSC2867). The binder's
+  // receipt-driven auto-clear does NOT fire when the room is already fully read
+  // (no receipt is sent below in that case), so clear it directly here.
+  if (readMarkedUnread(room)) {
+    setMarkedUnread(mx, roomId, false).catch(() => undefined);
+  }
+
   const receiptType =
     privateReceipt || privateReadReceipts ? ReceiptType.ReadPrivate : ReceiptType.Read;