Chore: Restructure Repository for SvelteKit

src/lib/state/library.svelte.ts

@@ -0,0 +1,53 @@
+import type { Manga } from '$lib/types'
+import type { MangaStatus } from '$lib/server-adapters/types'
+
+export type LibrarySortOption = 'alphabetical' | 'unread' | 'lastRead' | 'dateAdded'
+
+export const libraryState = $state({
+  items: [] as Manga[],
+  searchResults: [] as Manga[],
+  loading: false,
+  error: null as string | null,
+  filter: {
+    status: 'all' as MangaStatus | 'all',
+    tags: [] as string[],
+    unread: false,
+    query: '',
+  },
+  sort: 'alphabetical' as LibrarySortOption,
+  sortDesc: false,
+  view: 'grid' as 'grid' | 'list',
+  selected: new Set<string>(),
+})
+
+export const filteredItems = $derived.by(() => {
+  let result = libraryState.items
+
+  if (libraryState.filter.unread) {
+    result = result.filter(m => m.unreadCount > 0)
+  }
+  if (libraryState.filter.status !== 'all') {
+    result = result.filter(m => m.status === libraryState.filter.status)
+  }
+  if (libraryState.filter.tags.length > 0) {
+    result = result.filter(m =>
+      libraryState.filter.tags.every(tag => m.tags?.includes(tag))
+    )
+  }
+  if (libraryState.filter.query) {
+    const q = libraryState.filter.query.toLowerCase()
+    result = result.filter(m => m.title.toLowerCase().includes(q))
+  }
+
+  const sorted = [...result].sort((a, b) => {
+    switch (libraryState.sort) {
+      case 'unread':      return (b.unreadCount ?? 0) - (a.unreadCount ?? 0)
+      case 'lastRead':    return (b.lastReadAt ?? 0) - (a.lastReadAt ?? 0)
+      case 'dateAdded':   return (b.addedAt ?? 0) - (a.addedAt ?? 0)
+      case 'alphabetical':
+      default:            return a.title.localeCompare(b.title)
+    }
+  })
+
+  return libraryState.sortDesc ? sorted.reverse() : sorted
+})