Implement series route

src/routes/series/[mangaId]/+page.ts

@@ -0,0 +1,48 @@
+import { error } from '@sveltejs/kit'
+import type { PageLoad } from './$types'
+import { getAdapter } from '$lib/request-manager'
+import { seriesState } from '$lib/state/series.svelte'
+import { readerState } from '$lib/state/reader.svelte'
+
+export const load: PageLoad = async ({ params }) => {
+  const mangaId = params.mangaId
+
+  if (!mangaId) {
+    throw error(400, 'Missing manga id')
+  }
+
+  try {
+    seriesState.loading = true
+    seriesState.error = null
+    seriesState.chaptersLoading = true
+    seriesState.chaptersError = null
+
+    const adapter = getAdapter()
+    const [manga, chapters] = await Promise.all([
+      adapter.getManga(mangaId),
+      adapter.getChapters(mangaId),
+    ])
+
+    seriesState.current = manga
+    seriesState.chapters = chapters
+
+    readerState.manga = manga
+    readerState.chapters = chapters
+
+    return {
+      manga,
+      chapters,
+      mangaId,
+    }
+  } catch (err) {
+    const message = err instanceof Error ? err.message : String(err)
+
+    seriesState.error = message
+    seriesState.chaptersError = message
+
+    throw error(500, message)
+  } finally {
+    seriesState.loading = false
+    seriesState.chaptersLoading = false
+  }
+}