feat: Removes prompt argument from completion state

This commit removes the prompt argument from the completion state.
The argument is deleted from the context after the completion is handled.
This prevents unexpected behavior and ensures a cleaner state.

client/src/components/PromptsTab.tsx

@@ -74,6 +74,7 @@ const PromptsTab = ({
         },
         argName,
         value,
+        promptArgs,
       );
     }
   };