fix(chat): apply same setState bail-out to clearContexts for consistency

Matches the invariant we already established for the message effect:
calling setSelectedContexts([]) against an already-empty array emits a
fresh [] reference (Object.is bails out are not reference-level), which
cascades through consumers that key on selectedContexts identity.
clearContexts is part of the hook's public API so callers can't know
whether the list is empty — make it safe for them.

Made-with: Cursor

Author: waleedlatif1

apps/sim/app/workspace/[workspaceId]/w/[workflowId]/components/panel/components/copilot/components/user-input/hooks/use-context-management.ts

@@ -49,7 +49,7 @@ export function useContextManagement({ message, initialContexts }: UseContextMan
    * Clears all selected contexts
    */
   const clearContexts = useCallback(() => {
-    setSelectedContexts([])
+    setSelectedContexts((prev) => (prev.length === 0 ? prev : []))
   }, [])
 
   /**