feat: add slice to the store

src/redux/store.tsx

@@ -1,11 +1,13 @@
 import { configureStore } from '@reduxjs/toolkit'
 import deviceHealthReducer from './deviceHealthCheck/slice'
 import pinnedMessageReducer from './PinnedMessage/slice'
+import themeReducer from './theme/slice'
 
 const store = configureStore({
   reducer: {
     deviceHealth: deviceHealthReducer,
     pinnedMessage: pinnedMessageReducer,
+    theme: themeReducer,
   },
 })