client_state: create Var from value when pushing from backend (#4474)

This ensures that the value is properly escaped/formatted for direct use in
javascript code.

reflex/experimental/client_state.py

@@ -242,4 +242,5 @@ def push(self, value: Any) -> EventSpec:
         """
         if not self._global_ref:
             raise ValueError("ClientStateVar must be global to push the value.")
+        value = Var.create(value)
         return run_script(f"{_client_state_ref(self._setter_name)}({value})")