Chore: Restructure Repository for SvelteKit

src/lib/state/series.svelte.ts

@@ -0,0 +1,36 @@
+import type { Manga, Chapter } from '$lib/types'
+
+export const seriesState = $state({
+  current: null as Manga | null,
+  loading: false,
+  error: null as string | null,
+
+  chapters: [] as Chapter[],
+  chaptersLoading: false,
+  chaptersError: null as string | null,
+
+  chapterFilter: {
+    unread: false,
+    downloaded: false,
+    query: '',
+  },
+  chapterSortDesc: true,
+})
+
+export const filteredChapters = $derived.by(() => {
+  let result = seriesState.chapters
+
+  if (seriesState.chapterFilter.unread) {
+    result = result.filter(c => !c.read)
+  }
+  if (seriesState.chapterFilter.downloaded) {
+    result = result.filter(c => c.downloaded)
+  }
+  if (seriesState.chapterFilter.query) {
+    const q = seriesState.chapterFilter.query.toLowerCase()
+    result = result.filter(c => c.name.toLowerCase().includes(q))
+  }
+
+  const sorted = [...result].sort((a, b) => a.chapterNumber - b.chapterNumber)
+  return seriesState.chapterSortDesc ? sorted.reverse() : sorted
+})