fix: update dependencies and improve chat component structure

- Updated `lucide-svelte` dependency to version 0.552.0 across multiple files for consistency.
- Refactored chat components to enhance structure and readability, including adjustments to the Sidebar, ChatList, and MessageInput components.
- Improved notification handling in chat components to ensure better user experience and responsiveness.
- Added type safety enhancements in various components to ensure better integration with backend data models.

package.json

@@ -29,7 +29,7 @@
   "dependencies": {
     "@tanstack/svelte-form": "^1.23.8",
     "chart.js": "^4.5.1",
-    "lucide-svelte": "^0.548.0",
+    "lucide-svelte": "^0.552.0",
     "svelte-chartjs": "^3.1.5",
     "svelte-sonner": "^1.0.5"
   },