types: add format_group, library_type_name, manga_type to ReaderMetadata

- Move ReaderMetadata from api.ts to reader.d.ts as global type
- Add format_group field for format detection (reflowable/fixed_layout/comic_archive)
- Add library_type_name for library type (ebooks/comics/manga/pdf)
- Add manga_type for manga-specific reading direction metadata
- Remove duplicate mime_type field and fix typo (unkown -> unknown)

web/src/reader/reader.ts

@@ -0,0 +1,13 @@
+import "../alpine";
+import { Alpine } from "../alpine";
+// Core utilities (minimal set needed by reader)
+import "../api"; // API calls for reading progress
+import "../dom"; // DOM helpers
+import "../events"; // Event system
+import "../storage"; // localStorage helpers
+import "../theme"; // Theme support (reader needs theme)
+import "../toast"; // Toast notifications
+import "../toast-error"; // Error toasts
+// Reader functionality
+import "./reader-shell";
+Alpine.start();