Refactor device control logic and add temperature and fan speed enums

- Refactor device control logic in the app to improve readability and maintainability.
- Add temperature modes (hot, cold, wind) and fan speeds (auto, low, middle, high) enums.
- Update icon mappings and utility functions for temperature modes and fan speeds.

lib/features/app_layout/view/widgets/default_nav_bar.dart

@@ -14,7 +14,7 @@ class DefaultNavBar extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return BlocProvider(
-      create: (context) => DevicesCubit(),
+      create: (context) => DevicesCubit.getInstance(),
       child: BlocBuilder<DevicesCubit, DevicesState>(
         builder: (context, state) {
           return BlocBuilder<HomeCubit, HomeState>(
@@ -26,8 +26,8 @@ class DefaultNavBar extends StatelessWidget {
                   backgroundColor: Colors.transparent,
                   onTap: (int index) {
                     cubit.updatePageIndex(index);
-                    if (DevicesCubit.get(context).chosenCategoryView != null) {
-                      DevicesCubit.get(context)
+                    if (DevicesCubit.getInstance().chosenCategoryView != null) {
+                      DevicesCubit.getInstance()
                           .clearCategoriesSelection(context);
                     }
                     if (HomeCubit.getInstance().selectedRoom != null) {