fix(mothership): simplify queue callbacks — drop redundant deps and guard ref

- Remove `setMessageQueue` from useCallback deps (stable setter, never changes)
- Replace `sendNowProcessingRef` double-click guard with eager `messageQueueRef` update
- Simplify `editQueuedMessage` with same eager-ref pattern for consistency

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: waleedlatif1

apps/sim/app/workspace/[workspaceId]/home/hooks/use-chat.ts

@@ -741,7 +741,7 @@ export function useChat(
         sendMessageRef.current(next.content, next.fileAttachments, next.contexts)
       })
     }
-  }, [invalidateChatQueries, setMessageQueue])
+  }, [invalidateChatQueries])
 
   useEffect(() => {
     const activeStreamId = chatHistory?.activeStreamId
@@ -999,41 +999,31 @@ export function useChat(
     }
   }, [invalidateChatQueries, persistPartialResponse, executionStream])
 
-  const removeFromQueue = useCallback(
-    (id: string) => {
-      setMessageQueue((prev) => prev.filter((m) => m.id !== id))
-    },
-    [setMessageQueue]
-  )
+  const removeFromQueue = useCallback((id: string) => {
+    setMessageQueue((prev) => prev.filter((m) => m.id !== id))
+  }, [])
 
-  const sendNowProcessingRef = useRef<string | null>(null)
   const sendNow = useCallback(
     async (id: string) => {
-      if (sendNowProcessingRef.current === id) return
       const msg = messageQueueRef.current.find((m) => m.id === id)
       if (!msg) return
-      sendNowProcessingRef.current = id
-      try {
-        await stopGeneration()
-        setMessageQueue((prev) => prev.filter((m) => m.id !== id))
-        await sendMessage(msg.content, msg.fileAttachments, msg.contexts)
-      } finally {
-        sendNowProcessingRef.current = null
-      }
-    },
-    [stopGeneration, sendMessage, setMessageQueue]
-  )
-
-  const editQueuedMessage = useCallback(
-    (id: string): QueuedMessage | undefined => {
-      const msg = messageQueueRef.current.find((m) => m.id === id)
-      if (!msg) return undefined
+      // Eagerly update ref so a rapid second click finds the message already gone
+      messageQueueRef.current = messageQueueRef.current.filter((m) => m.id !== id)
+      await stopGeneration()
       setMessageQueue((prev) => prev.filter((m) => m.id !== id))
-      return msg
+      await sendMessage(msg.content, msg.fileAttachments, msg.contexts)
     },
-    [setMessageQueue]
+    [stopGeneration, sendMessage]
   )
 
+  const editQueuedMessage = useCallback((id: string): QueuedMessage | undefined => {
+    const msg = messageQueueRef.current.find((m) => m.id === id)
+    if (!msg) return undefined
+    messageQueueRef.current = messageQueueRef.current.filter((m) => m.id !== id)
+    setMessageQueue((prev) => prev.filter((m) => m.id !== id))
+    return msg
+  }, [])
+
   useEffect(() => {
     return () => {
       streamGenRef.current++