fix(metadata): improve Libro.fm metadata integration

Persist Libro.fm identifiers across metadata refresh, editing, file round trips, and provider links. Enable explicitly selected audiobook providers during Auto-fill and retain AudNexus ASINs as Audible identifiers.

packages/types/src/book.ts

@@ -188,6 +188,7 @@ export type BookMetadataRefreshPreviewFields = {
   openLibraryId?: string | null;
   itunesId?: string | null;
   audibleId?: string | null;
+  librofmId?: string | null;
   koboId?: string | null;
   comicvineId?: string | null;
   ranobedbId?: string | null;

packages/types/src/file-write.ts

@@ -50,6 +50,7 @@ export const BOOK_FILE_WRITE_FIELDS = [
   ...COMIC_BOOK_FILE_WRITE_FIELDS,
   "itunesId",
   "audibleId",
+  "librofmId",
   "narrators",
   "coverBytes",
 ] as const;
@@ -96,6 +97,7 @@ export const BOOK_FILE_WRITE_FIELD_LABELS = {
   comicStoryArcs: "Story arcs",
   itunesId: "iTunes ID",
   audibleId: "Audible ID",
+  librofmId: "Libro.fm ISBN",
   narrators: "Narrators",
   coverBytes: "Cover",
 } as const satisfies Record<BookFileWriteField, string>;
@@ -133,6 +135,7 @@ export const AUDIO_BOOK_FILE_WRITE_FIELDS = [
   "seriesName",
   "seriesIndex",
   "audibleId",
+  "librofmId",
   "coverBytes",
 ] as const satisfies readonly BookFileWriteField[];
 

packages/types/src/metadata-lock.ts

@@ -26,6 +26,7 @@ export const BOOK_METADATA_LOCK_FIELDS = [
   "openLibraryId",
   "itunesId",
   "audibleId",
+  "librofmId",
   "koboId",
   "comicvineId",
   "ranobedbId",