Chore: Port over Extensions & Search

src/lib/core/filesystem.ts

@@ -0,0 +1,48 @@
+import { platformService } from '$lib/platform-service'
+import { seriesState }     from '$lib/state/series.svelte'
+import { addToast }        from '$lib/state/notifications.svelte'
+import type { Manga }      from '$lib/types'
+
+function sanitizeTitle(title: string): string {
+  return title.replace(/[\\/:*?"<>|]/g, '').replace(/\s+/g, ' ').trim()
+}
+
+async function getDownloadsRoot(): Promise<string> {
+  let root = (seriesState.settings as any).downloadsPath?.trim() ?? ''
+  if (!root) root = await platformService.getDefaultDownloadsPath().catch(() => '')
+  return root
+}
+
+function join(root: string, ...parts: string[]): string {
+  const sep = root.includes('\\') ? '\\' : '/'
+  return [root.replace(/[/\\]$/, ''), ...parts].join(sep)
+}
+
+export async function openMangaFolder(manga: Manga): Promise<void> {
+  if (!platformService.isSupported('filesystem')) {
+    addToast({ kind: 'info', title: 'Desktop only', body: 'Opening folders requires the desktop app.' })
+    return
+  }
+  const root = await getDownloadsRoot()
+  if (!root) return
+  await platformService.openPath(join(root, 'mangas', sanitizeTitle(manga.title))).catch(console.error)
+}
+
+export async function openCustomFolder(path: string): Promise<void> {
+  if (!platformService.isSupported('filesystem')) {
+    addToast({ kind: 'info', title: 'Desktop only', body: 'Opening folders requires the desktop app.' })
+    return
+  }
+  if (!path?.trim()) return
+  await platformService.openPath(path).catch(console.error)
+}
+
+export async function openDownloadsFolder(): Promise<void> {
+  if (!platformService.isSupported('filesystem')) {
+    addToast({ kind: 'info', title: 'Desktop only', body: 'Opening folders requires the desktop app.' })
+    return
+  }
+  const root = await getDownloadsRoot()
+  if (!root) return
+  await platformService.openPath(join(root, 'mangas')).catch(console.error)
+}