fix(forward): one forbidden target no longer fails the whole multi-room forward (#194 P6-3)

All targets were sent concurrently through matrix-js-sdk's message queue;
when the send to a room you cannot post to failed with 403 the scheduler
clearQueue()'d every send still waiting, so 'Send to 3 rooms' with one
read-only room reported 'Failed to forward' for all three and left a
half-sent comment in the first. Rooms are now sent one at a time.
Verified: 'Forwarded to 2/3. Failed: Read Only Room.' and both good rooms
receive comment + forwarded message.

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

src/app/features/room/message/ForwardMessageDialog.tsx

@@ -338,8 +338,12 @@ export function ForwardMessageDialog({ mEvent, onClose }: Props) {
     }
 
     const commentBody = comment.trim();
-    const results = await Promise.allSettled(
+    // Rooms are sent ONE AT A TIME. matrix-js-sdk queues message sends, and
-      ids.map((id) => {
+    // when one queued send fails permanently (e.g. 403 in a room you cannot
+    // post to) the scheduler rejects every send still waiting in the queue —
+    // so firing all rooms concurrently turned one forbidden target into
+    // "Failed to forward" for all of them, with half-sent comments (Gitea #194).
+    const sendToRoom = (id: string): Promise<unknown> => {
       const destEncrypted = !!mx.getRoom(id)?.hasEncryptionStateEvent();
       // Encrypted destinations keep the original (possibly encrypted-attachment)
       // content; unencrypted ones get the plaintext version, or fail outright if
@@ -365,8 +369,12 @@ export function ForwardMessageDialog({ mEvent, onClose }: Props) {
             })
         : Promise.resolve();
       return step.then(sendForward);
-      }),
+    };
-    );
+    const results: PromiseSettledResult<unknown>[] = [];
+    for (const id of ids) {
+      // eslint-disable-next-line no-await-in-loop
+      results.push(...(await Promise.allSettled([sendToRoom(id)])));
+    }
 
     const failedIds: string[] = [];
     const failedNames: string[] = [];