Import: allow selecting specific audio files

Add support for selecting individual audio files during manual and bulk imports and pass that selection through the scan, API, job queue, processor and organizer.

Key changes:
- API: scan now returns audioFiles for each discovered book and emits a new 'grouping' progress phase; execute and manual-import routes accept file lists (audioFiles / selectedFiles) and validate them.
- Scanner: group loose audio files by metadata (title/author/narrator), deduplicate multi-part sets (CD1/CD2) across folders, and return audioFiles + groupingKey; add concurrency limit for ffprobe reads and merge groups post-scan.
- Job queue & processor: OrganizeFiles payload now includes selectedFiles; processors forward selectedFiles to the FileOrganizer and to cleanup logic.
- File organizer & cleanup: filter to only selectedFiles when organizing; cleanup now deletes only the selected files (if provided) instead of removing the whole directory.
- UI: Manual import browser and bulk import wizard updated to show per-file selection, track checkedFiles, toggle all, and send selected files to the API; ConfirmPhase updated to allow checking/unchecking files and prevents starting import with no files selected.
- Filesystem browse: removed expensive per-subfolder stats to keep browsing responsive (now lists subdirectories without nested stat calls).

Overall this change enables finer-grained imports, reduces accidental deletion of unselected files, and improves scan grouping for multi-folder audiobooks.

src/components/admin/BulkImportWizard.tsx

@@ -205,6 +205,7 @@ export function BulkImportWizard({ isOpen, onClose }: BulkImportWizardProps) {
           imports: booksToImport.map((b) => ({
             folderPath: b.folderPath,
             asin: b.match!.asin,
+            audioFiles: b.audioFiles,
           })),
         }),
       });

src/components/admin/bulk-import/ScanFolderStep.tsx

@@ -18,13 +18,12 @@ import {
   HomeIcon,
   ChevronRightIcon,
   ArrowLeftIcon,
-  MusicalNoteIcon,
   ExclamationTriangleIcon,
   ArrowPathIcon,
   MagnifyingGlassIcon,
 } from '@heroicons/react/24/outline';
 import { fetchWithAuth } from '@/lib/utils/api';
-import { RootEntry, DirectoryEntry, formatBytes } from './types';
+import { RootEntry, DirectoryEntry } from './types';
 
 function SkeletonRow() {
   return (
@@ -149,9 +148,8 @@ export function ScanFolderStep({ onFolderSelected }: ScanFolderStepProps) {
     ];
   })();
 
-  // Count total audio files and subfolders in current listing
-  const totalSubfolders = entries.reduce((sum, e) => sum + e.subfolderCount, 0);
-  const totalAudioInChildren = entries.reduce((sum, e) => sum + e.audioFileCount, 0);
+  // Count subfolders in current listing
+  const totalSubfolders = entries.length;
 
   return (
     <div className="flex flex-col h-full">
@@ -248,7 +246,6 @@ export function ScanFolderStep({ onFolderSelected }: ScanFolderStepProps) {
         {currentPath && !isLoading && !error && entries.length > 0 && (
           <div className="divide-y divide-gray-100 dark:divide-gray-800">
             {entries.map((entry) => {
-              const hasAudio = entry.audioFileCount > 0;
               const isHovered = hoveredFolder === entry.name;
 
               return (
@@ -267,33 +264,9 @@ export function ScanFolderStep({ onFolderSelected }: ScanFolderStepProps) {
                     )}
                   </div>
 
-                  <div className="flex-1 min-w-0">
-                    <p className="text-sm font-medium text-gray-900 dark:text-gray-100 truncate">
-                      {entry.name}
-                    </p>
-                    <p className="text-xs text-gray-500 dark:text-gray-400">
-                      {entry.subfolderCount > 0 && (
-                        <span>{entry.subfolderCount} folder{entry.subfolderCount !== 1 ? 's' : ''}</span>
-                      )}
-                      {entry.subfolderCount > 0 && entry.audioFileCount > 0 && <span> &middot; </span>}
-                      {entry.audioFileCount > 0 && (
-                        <span>{entry.audioFileCount} audio file{entry.audioFileCount !== 1 ? 's' : ''}</span>
-                      )}
-                      {entry.totalSize > 0 && (
-                        <span> &middot; {formatBytes(entry.totalSize)}</span>
-                      )}
-                      {entry.subfolderCount === 0 && entry.audioFileCount === 0 && (
-                        <span className="italic">Empty</span>
-                      )}
-                    </p>
-                  </div>
-
-                  {hasAudio && (
-                    <span className="flex-shrink-0 inline-flex items-center gap-1 px-2 py-0.5 rounded-full bg-blue-100 dark:bg-blue-900/30 text-blue-700 dark:text-blue-300 text-xs font-medium">
-                      <MusicalNoteIcon className="w-3 h-3" />
-                      {entry.audioFileCount}
-                    </span>
-                  )}
+                  <p className="flex-1 min-w-0 text-sm font-medium text-gray-900 dark:text-gray-100 truncate">
+                    {entry.name}
+                  </p>
 
                   <ChevronRightIcon className="w-4 h-4 text-gray-300 dark:text-gray-600 flex-shrink-0" />
                 </button>
@@ -325,10 +298,7 @@ export function ScanFolderStep({ onFolderSelected }: ScanFolderStepProps) {
             <p className="font-mono text-xs text-gray-500 dark:text-gray-500 truncate">{currentPath}</p>
             {entries.length > 0 && (
               <p className="mt-0.5">
-                {entries.length} subfolder{entries.length !== 1 ? 's' : ''}
-                {totalAudioInChildren > 0 && (
-                  <span> &middot; {totalAudioInChildren} audio files visible</span>
-                )}
+                {totalSubfolders} subfolder{totalSubfolders !== 1 ? 's' : ''}
               </p>
             )}
           </div>

src/components/admin/bulk-import/types.ts

@@ -14,9 +14,6 @@ export interface RootEntry {
 export interface DirectoryEntry {
   name: string;
   type: 'directory';
-  audioFileCount: number;
-  subfolderCount: number;
-  totalSize: number;
 }
 
 /** Audible match data for a discovered audiobook. */
@@ -39,6 +36,7 @@ export interface ScannedBook {
   totalSizeBytes: number;
   metadataSource: 'tags' | 'file_name';
   searchTerm: string;
+  audioFiles: string[];
   match: AudibleMatch | null;
   inLibrary: boolean;
   hasActiveRequest: boolean;
@@ -48,7 +46,7 @@ export interface ScannedBook {
 
 /** Progress event from the SSE scan stream. */
 export interface ScanProgressEvent {
-  phase: 'discovering' | 'reading_metadata';
+  phase: 'discovering' | 'reading_metadata' | 'grouping';
   foldersScanned: number;
   audiobooksFound: number;
   currentFolder?: string;