Add custom search terms & retry download (admin)

Add support for per-request custom search terms and an admin retry-download flow.

- DB/schema: add custom_search_terms column via Prisma migration and schema update.
- Admin UI: new AdjustSearchTermsModal component and UI badges to show custom search status; RequestActionsDropdown and RecentRequestsTable updated to surface adjust/retry actions.
- API: new PATCH /api/admin/requests/[id]/search-terms to set/clear custom terms (optionally trigger a new search) and new POST /api/admin/requests/[id]/retry-download to resume monitoring or re-add downloads using DownloadHistory metadata.
- Behavior: interactive search now prefers customSearchTerms when present; manual import exposes cleanupSource option to organize job; admin requests listing returns downloadAttempts and customSearchTerms.
- UX: add SectionToolbar, LoadMoreBar and HideAvailableToggle components and wire hide-available preference across home, search, author and series pages; authors/series endpoints/page handlers gain pagination metadata.
- Misc: add connection-errors util and update related processors/services and tests to cover the new flows.

These changes enable admins to override search terms per request, trigger searches from the admin UI, and retry failed downloads more robustly.

src/components/audiobooks/ManualImportBrowser.tsx

@@ -59,6 +59,9 @@ export function ManualImportBrowser({
   const [isImporting, setIsImporting] = useState(false);
   const [importError, setImportError] = useState<string | null>(null);
 
+  // Cleanup source toggle
+  const [cleanupSource, setCleanupSource] = useState(false);
+
   // Hover state for folder icon swap
   const [hoveredFolder, setHoveredFolder] = useState<string | null>(null);
 
@@ -188,6 +191,7 @@ export function ManualImportBrowser({
         body: JSON.stringify({
           asin: audiobook.asin,
           folderPath: selectedPath,
+          cleanupSource,
         }),
       });
       const data = await res.json();
@@ -288,6 +292,8 @@ export function ManualImportBrowser({
               isImporting={isImporting}
               importError={importError}
               slideClass={slideClass}
+              cleanupSource={cleanupSource}
+              onCleanupSourceChange={setCleanupSource}
               onBack={handleBackToBrowse}
               onStartImport={handleStartImport}
             />

src/components/audiobooks/manual-import/ConfirmPhase.tsx

@@ -22,6 +22,8 @@ interface ConfirmPhaseProps {
   isImporting: boolean;
   importError: string | null;
   slideClass: string;
+  cleanupSource: boolean;
+  onCleanupSourceChange: (value: boolean) => void;
   onBack: () => void;
   onStartImport: () => void;
 }
@@ -35,6 +37,8 @@ export function ConfirmPhase({
   isImporting,
   importError,
   slideClass,
+  cleanupSource,
+  onCleanupSourceChange,
   onBack,
   onStartImport,
 }: ConfirmPhaseProps) {
@@ -99,6 +103,30 @@ export function ConfirmPhase({
             ))}
           </div>
         </div>
+
+        {/* Cleanup source toggle */}
+        <div className="p-4 rounded-xl bg-gray-50 dark:bg-gray-800/50 border border-gray-200 dark:border-gray-700">
+          <div className="flex items-center justify-between">
+            <div>
+              <p className="text-sm font-medium text-gray-900 dark:text-gray-100">
+                Cleanup source files
+              </p>
+              <p className="text-xs text-gray-500 dark:text-gray-400 mt-0.5">
+                Delete original files after successful import
+              </p>
+            </div>
+            <label className="relative inline-flex items-center cursor-pointer">
+              <input
+                type="checkbox"
+                checked={cleanupSource}
+                onChange={(e) => onCleanupSourceChange(e.target.checked)}
+                disabled={isImporting}
+                className="sr-only peer"
+              />
+              <div className="w-11 h-6 bg-gray-200 peer-focus:outline-none peer-focus:ring-4 peer-focus:ring-blue-300 dark:peer-focus:ring-blue-800 rounded-full peer dark:bg-gray-700 peer-checked:after:translate-x-full rtl:peer-checked:after:-translate-x-full peer-checked:after:border-white after:content-[''] after:absolute after:top-[2px] after:start-[2px] after:bg-white after:border-gray-300 after:border after:rounded-full after:h-5 after:w-5 after:transition-all dark:border-gray-600 peer-checked:bg-blue-600"></div>
+            </label>
+          </div>
+        </div>
       </div>
 
       {/* Error display */}