fix(messaging): a sent message no longer shows "Seen" instantly

Two independent defects; either alone caused it, in DMs, groups and channels.

1. useMessages reported a read of the newest NON-PENDING message regardless of
   author. Sending therefore made the client immediately mark its own message
   read, the server echoed a receipt for it, and the sender's bubble showed
   "Seen" before anyone had opened the thread. You do not read your own message:
   lastReadableId now skips your own.

2. The guard meant to catch exactly this — `e.actorId !== currentActorId` — could
   never fire: the receipt carries the reader's IIOS actor UUID while clients hold
   a userId, so the comparison was always true and every receipt, including your
   own, counted as the other side. The gateway now also emits userId on READ and
   DELIVERED receipts (matching what `annotation` already did), and ReceiptEvent
   carries it as optional so older servers still typecheck.

MockAdapter.markRead was a no-op, so it could not exercise any of this; it now
echoes a receipt like a real server. Regression test verified to fail without
the fix. SDK 0.1.14; suite 17 files / 101 tests.

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

packages/iios-messaging-ui/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@insignia/iios-messaging-ui",
-  "version": "0.1.13",
+  "version": "0.1.14",
   "type": "module",
   "main": "dist/index.js",
   "module": "dist/index.js",

packages/iios-messaging-ui/src/adapters/mock.ts

@@ -270,8 +270,9 @@ export class MockAdapter implements MessagingAdapter {
     // No-op: nobody is typing back in a mock.
   }
 
-  async markRead(): Promise<void> {
-    // No-op: the mock has no second party to report a read.
+  /** Echo a receipt the way a real server does, so the "ignore my own read" path is exercised. */
+  async markRead(threadId: string, messageId: string): Promise<void> {
+    this.emit(threadId, { kind: 'receipt', messageId, actorId: ME });
   }
 
   isConnected(): boolean {

packages/iios-messaging-ui/src/hooks/use-messages.test.tsx

@@ -158,3 +158,39 @@ describe('useMessages', () => {
     }
   });
 });
+
+describe('read receipts', () => {
+  // REGRESSION: the hook reported a read of the newest message regardless of author, so sending a
+  // message made the server echo a receipt for it and the sender's own bubble showed "Seen"
+  // immediately — in DMs, groups and channels alike, before anyone had opened it.
+  it('never reports a read of my own message', async () => {
+    const adapter = new MockAdapter();
+    const markRead = vi.spyOn(adapter, 'markRead');
+
+    const { result } = renderHook(() => useMessages('th_mock_1'), { wrapper: wrap(adapter) });
+    await waitFor(() => expect(result.current.loading).toBe(false));
+    markRead.mockClear();
+
+    await act(async () => {
+      await result.current.send('a message from me');
+    });
+
+    // The newest message is now mine — reading it would be reading myself.
+    const mine = result.current.messages.filter((m) => m.mine).map((m) => m.id);
+    for (const call of markRead.mock.calls) expect(mine).not.toContain(call[1]);
+  });
+
+  it('does not mark my message seen just because the receipt came back', async () => {
+    const adapter = new MockAdapter();
+    const { result } = renderHook(() => useMessages('th_mock_1'), { wrapper: wrap(adapter) });
+    await waitFor(() => expect(result.current.loading).toBe(false));
+
+    await act(async () => {
+      await result.current.send('hello there');
+    });
+
+    const mine = result.current.messages.find((m) => m.mine && m.text === 'hello there');
+    expect(mine).toBeDefined();
+    expect(result.current.seenIds.has(mine!.id)).toBe(false);
+  });
+});

packages/iios-messaging-ui/src/hooks/use-messages.ts

@@ -160,13 +160,19 @@ export function useMessages(threadId: string | null): MessagesState {
     if (threadId) adapter.sendTyping(threadId);
   }, [adapter, threadId]);
 
-  // The newest acknowledged (non-pending) message id — what we report as read.
+  // The newest acknowledged (non-pending) message id from SOMEONE ELSE — what we report as read.
+  //
+  // Skipping my own messages is load-bearing, not tidiness: reporting a read of the message I just
+  // sent makes the server broadcast a receipt for it, and the sender's own client then paints it
+  // "Seen" the instant it is delivered, before anyone has looked at it.
   const lastReadableId = useMemo(() => {
     for (let i = raw.length - 1; i >= 0; i--) {
-      if (!raw[i]!.pending) return raw[i]!.id;
+      const m = raw[i]!;
+      if (m.pending || isOwnMessage(m, currentActorId)) continue;
+      return m.id;
     }
     return null;
-  }, [raw]);
+  }, [raw, currentActorId]);
 
   // Report my read of the newest message (drives the other side's "seen" tick).
   // Keyed on the id, not the whole array, so reaction/optimistic churn doesn't re-fire it.