fix file by id in the parent field

src/main/MainApp.ts

@@ -225,6 +225,9 @@ export class MainApp {
 
     ipcMain.handle(IPC_CHANNELS.libraryScan, async () => this.requireLibrary().scanLibrary());
     ipcMain.handle(IPC_CHANNELS.libraryList, async () => this.requireLibrary().listFiles());
+    ipcMain.handle(IPC_CHANNELS.libraryGetById, async (_event: IpcMainInvokeEvent, fileId: number) =>
+      this.requireLibrary().getFileById(fileId)
+    );
     ipcMain.handle(IPC_CHANNELS.libraryDuplicates, async () => this.requireLibrary().listDuplicates());
     ipcMain.handle(IPC_CHANNELS.searchQuery, async (_event: IpcMainInvokeEvent, query: string) =>
       this.requireSearch().search(query)

src/main/services/LibraryService.ts

@@ -214,6 +214,20 @@ export class LibraryService {
     return this.database.listFiles();
   }
 
+  /**
+   * Attempts to resolve a file summary by id. Returns null when the record no longer exists.
+   */
+  public getFileById(fileId: number): AudioFileSummary | null {
+    try {
+      return this.database.getFileById(fileId);
+    } catch (error) {
+      if (error instanceof Error) {
+        console.warn(`Failed to resolve file by id ${fileId}:`, error.message);
+      }
+      return null;
+    }
+  }
+
   /**
    * Returns groups of files that have identical checksums (potential duplicates).
    */