chore: update dependencies and enhance vacation request component

- Updated convex-svelte to version 0.0.12 and convex to version 1.28.2 for improved functionality.
- Refactored the vacation request component to enhance loading states and error handling.
- Implemented derived states for better management of loading and error states.
- Improved calendar initialization logic and cleanup processes for better performance and reliability.

apps/web/package.json

@@ -44,7 +44,7 @@
     "@types/papaparse": "^5.3.14",
     "better-auth": "catalog:",
     "convex": "catalog:",
-    "convex-svelte": "^0.0.11",
+    "convex-svelte": "^0.0.12",
     "date-fns": "^4.1.0",
     "emoji-picker-element": "^1.27.0",
     "is-network-error": "^1.3.0",