matrix-mxid: return invite_sent so the dashboard can confirm the invite is on its way

app/main.py

@@ -2677,12 +2677,16 @@ async def broker_set_matrix_mxid(request: Request):
     set_member_matrix_mxid(email, mxid)
     # Invite the new account into the Space immediately (best-effort; the daily
     # sync will also pick it up). Clear = no invite (just removes the mapping).
+    invite_sent = True
     if mxid:
         try:
             await sync_matrix_space()
         except Exception as e:
             logger.warning("matrix-mxid: immediate invite failed: %s", e)
-    return {"status": "saved", "matrix_mxid": mxid}
+            invite_sent = False
+    # invite_sent=False tells the dashboard the nightly sync will retry; the
+    # mapping is saved either way, so the member gets a confident confirmation.
+    return {"status": "saved", "matrix_mxid": mxid, "invite_sent": invite_sent}
 
 
 async def broker_get_usage(email: str, days: int = 0) -> dict: