Update package dependencies and refactor state management in Svelte components

- Added `mode-watcher` and `svelte-sonner` as dependencies to enhance application functionality.
- Refactored state management in various Svelte components to use `$app/state` instead of `$app/stores`, improving consistency across the application.
- Updated UI components to utilize new features from the added dependencies, enhancing user experience and responsiveness.
- Improved loading states and error handling in data-fetching components, ensuring better feedback during asynchronous operations.

web/src/lib/components/ui/switch/index.ts

@@ -0,0 +1,7 @@
+import Root from "./switch.svelte";
+
+export {
+	Root,
+	//
+	Root as Switch,
+};