refactor(auth): implement token-based authentication with JWT parsing

- Replace authStore with tokenService for authentication management
- Add JWT parsing utility to extract user info from tokens
- Update login flow to use cookie-based token storage
- Modify logout to properly clear auth state and cookies
- Integrate user data into page context for SSR compatibility
- Remove deprecated authStore and related localStorage logic
- Add cookie constants for consistent token handling
- Implement server-side token validation in hooks
- Update HTTP client to use token from cookies instead of store
- Refactor error handling to use unified ApiError class
- Replace manual redirect logic with resolved paths
- Improve type safety with explicit user and auth interfaces
- Add toast notifications for login/logout feedback
- Remove unused sidebar store and related UI logic
- Migrate theme handling to use cookies and context
- Update icon definitions and component references
- Clean up legacy code and unused imports

src/lib/components/ToastContainer.svelte

@@ -1,9 +1,11 @@
 <script lang="ts">
-	import { toast, type ToastType } from '$lib/stores/toastStore';
 	import { fly } from 'svelte/transition';
 	import { flip } from 'svelte/animate';
 	import Icon from '$lib/components/icon/Icon.svelte';
 	import type { IconId } from '$lib/types/icon-ids.ts';
+	import { getContext } from 'svelte';
+	import { TOAST_KEY, type ToastState, type ToastType } from '$lib/stores/toast.svelte.ts';
+	const toastState = getContext<ToastState>(TOAST_KEY);
 
 	const toastIconMap: Record<ToastType, IconId> = {
 		success: 'success',
@@ -14,7 +16,7 @@
 </script>
 
 <div class="toast  toast-top toast-center z-50">
-	{#each $toast as t (t.id)}
+	{#each toastState.toasts as t (t.id)}
 		<div
 			animate:flip={{ duration: 300 }}
 			transition:fly={{ x: 100, duration: 300 }}