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/app/authors/[asin]/page.tsx

@@ -5,16 +5,17 @@
 
 'use client';
 
-import { use, useCallback } from 'react';
+import { use, useCallback, useMemo } from 'react';
 import { useRouter, useSearchParams } from 'next/navigation';
 import { Header } from '@/components/layout/Header';
 import { AudiobookGrid } from '@/components/audiobooks/AudiobookGrid';
+import { LoadMoreBar } from '@/components/ui/LoadMoreBar';
 import { AuthorDetailCard, AuthorDetailSkeleton } from '@/components/authors/AuthorDetailCard';
 import { SimilarAuthorsRow, SimilarAuthorsSkeleton } from '@/components/authors/SimilarAuthorsRow';
 import { useAuthorDetail, useAuthorBooks } from '@/lib/hooks/useAuthors';
+import { Audiobook } from '@/lib/hooks/useAudiobooks';
 import { ProtectedRoute } from '@/components/auth/ProtectedRoute';
-import { CardSizeControls } from '@/components/ui/CardSizeControls';
-import { SquareCoversToggle } from '@/components/ui/SquareCoversToggle';
+import { SectionToolbar } from '@/components/ui/SectionToolbar';
 import { usePreferences } from '@/contexts/PreferencesContext';
 
 export default function AuthorDetailPage({
@@ -27,11 +28,11 @@ export default function AuthorDetailPage({
   const searchParams = useSearchParams();
   const fromAuthorName = searchParams.get('from');
   const { author, isLoading: authorLoading } = useAuthorDetail(asin);
-  const { books, totalBooks, isLoading: booksLoading } = useAuthorBooks(
+  const { books, totalBooks, hasMore, isLoading: booksLoading, isLoadingMore, loadMore } = useAuthorBooks(
     asin,
     author?.name || null
   );
-  const { cardSize, setCardSize, squareCovers, setSquareCovers } = usePreferences();
+  const { cardSize, setCardSize, squareCovers, setSquareCovers, hideAvailable, setHideAvailable } = usePreferences();
 
   const handleBack = useCallback(() => {
     // Use browser back if we came from within the app, otherwise fallback to /authors
@@ -42,6 +43,20 @@ export default function AuthorDetailPage({
     }
   }, [router]);
 
+  // Filter out available titles when hideAvailable is enabled
+  const filteredBooks = useMemo(
+    () => hideAvailable ? books.filter((b: Audiobook) => !b.isAvailable && b.requestStatus !== 'completed') : books,
+    [books, hideAvailable]
+  );
+
+  // Header count text: reflects filtered counts
+  const visibleCount = filteredBooks.length;
+  const booksCountText = hasMore && totalBooks > books.length
+    ? `${visibleCount.toLocaleString()} of ${totalBooks.toLocaleString()} title${totalBooks !== 1 ? 's' : ''}`
+    : visibleCount > 0
+      ? `${visibleCount.toLocaleString()} title${visibleCount !== 1 ? 's' : ''}`
+      : '';
+
   return (
     <ProtectedRoute>
       <div className="min-h-screen">
@@ -91,27 +106,42 @@ export default function AuthorDetailPage({
                     <h2 className="text-xl sm:text-2xl font-bold text-gray-900 dark:text-gray-100 truncate">
                       Books
                     </h2>
-                    {!booksLoading && totalBooks > 0 && (
+                    {!booksLoading && booksCountText && (
                       <span className="text-sm text-gray-600 dark:text-gray-400 hidden sm:inline whitespace-nowrap">
-                        ({totalBooks} title{totalBooks !== 1 ? 's' : ''})
+                        ({booksCountText})
                       </span>
                     )}
-                    <div className="ml-auto flex items-center gap-1">
-                      <SquareCoversToggle enabled={squareCovers} onToggle={setSquareCovers} />
-                      <CardSizeControls size={cardSize} onSizeChange={setCardSize} />
-                    </div>
+                    <SectionToolbar
+                      hideAvailable={hideAvailable}
+                      onToggleHideAvailable={setHideAvailable}
+                      squareCovers={squareCovers}
+                      onToggleSquareCovers={setSquareCovers}
+                      cardSize={cardSize}
+                      onCardSizeChange={setCardSize}
+                    />
                   </div>
                 </div>
               </div>
 
               {/* Books Grid */}
               <AudiobookGrid
-                audiobooks={books}
+                audiobooks={filteredBooks}
                 isLoading={booksLoading}
                 emptyMessage={`No books found for ${author.name}`}
                 cardSize={cardSize}
                 squareCovers={squareCovers}
               />
+
+              {/* Load More Bar */}
+              {filteredBooks.length > 0 && (
+                <LoadMoreBar
+                  loadedCount={filteredBooks.length}
+                  totalCount={totalBooks > 0 ? totalBooks : undefined}
+                  hasMore={hasMore}
+                  isLoading={isLoadingMore}
+                  onLoadMore={loadMore}
+                />
+              )}
             </div>
           )}
         </main>