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/contexts/PreferencesContext.tsx

@@ -10,6 +10,7 @@ import React, { createContext, useContext, useState, useEffect, ReactNode } from
 interface Preferences {
   cardSize: number; // 1-9, default 5
   squareCovers: boolean; // true = square (1:1), false = rectangle (2:3)
+  hideAvailable: boolean; // true = hide "In Your Library" titles
 }
 
 interface PreferencesContextType {
@@ -17,6 +18,8 @@ interface PreferencesContextType {
   setCardSize: (size: number) => void;
   squareCovers: boolean;
   setSquareCovers: (enabled: boolean) => void;
+  hideAvailable: boolean;
+  setHideAvailable: (enabled: boolean) => void;
 }
 
 const PreferencesContext = createContext<PreferencesContextType | undefined>(undefined);
@@ -24,6 +27,7 @@ const PreferencesContext = createContext<PreferencesContextType | undefined>(und
 const DEFAULT_PREFERENCES: Preferences = {
   cardSize: 5,
   squareCovers: true,
+  hideAvailable: false,
 };
 
 const STORAGE_KEY = 'preferences';
@@ -31,6 +35,7 @@ const STORAGE_KEY = 'preferences';
 export function PreferencesProvider({ children }: { children: ReactNode }) {
   const [cardSize, setCardSizeState] = useState<number>(DEFAULT_PREFERENCES.cardSize);
   const [squareCovers, setSquareCoversState] = useState<boolean>(DEFAULT_PREFERENCES.squareCovers);
+  const [hideAvailable, setHideAvailableState] = useState<boolean>(DEFAULT_PREFERENCES.hideAvailable);
 
   // Load preferences from localStorage on mount
   useEffect(() => {
@@ -49,11 +54,14 @@ export function PreferencesProvider({ children }: { children: ReactNode }) {
         }
         // Load squareCovers preference (defaults to false if not set)
         setSquareCoversState(preferences.squareCovers ?? DEFAULT_PREFERENCES.squareCovers);
+        // Load hideAvailable preference
+        setHideAvailableState(preferences.hideAvailable ?? DEFAULT_PREFERENCES.hideAvailable);
       }
     } catch (error) {
       console.error('Failed to load preferences from localStorage:', error);
       setCardSizeState(DEFAULT_PREFERENCES.cardSize);
       setSquareCoversState(DEFAULT_PREFERENCES.squareCovers);
+      setHideAvailableState(DEFAULT_PREFERENCES.hideAvailable);
     }
   }, []);
 
@@ -92,6 +100,22 @@ export function PreferencesProvider({ children }: { children: ReactNode }) {
     }
   };
 
+  // Update hideAvailable preference in state and localStorage
+  const setHideAvailable = (enabled: boolean) => {
+    if (typeof window === 'undefined') return;
+
+    setHideAvailableState(enabled);
+
+    try {
+      const stored = localStorage.getItem(STORAGE_KEY);
+      const preferences: Preferences = stored ? JSON.parse(stored) : { ...DEFAULT_PREFERENCES };
+      preferences.hideAvailable = enabled;
+      localStorage.setItem(STORAGE_KEY, JSON.stringify(preferences));
+    } catch (error) {
+      console.error('Failed to save preferences to localStorage:', error);
+    }
+  };
+
   // Listen for storage changes in other tabs (cross-tab sync)
   useEffect(() => {
     if (typeof window === 'undefined') return;
@@ -106,6 +130,8 @@ export function PreferencesProvider({ children }: { children: ReactNode }) {
           }
           // Sync squareCovers preference
           setSquareCoversState(preferences.squareCovers ?? DEFAULT_PREFERENCES.squareCovers);
+          // Sync hideAvailable preference
+          setHideAvailableState(preferences.hideAvailable ?? DEFAULT_PREFERENCES.hideAvailable);
         } catch (error) {
           console.error('Failed to parse preferences from storage event:', error);
         }
@@ -119,7 +145,7 @@ export function PreferencesProvider({ children }: { children: ReactNode }) {
   }, []);
 
   return (
-    <PreferencesContext.Provider value={{ cardSize, setCardSize, squareCovers, setSquareCovers }}>
+    <PreferencesContext.Provider value={{ cardSize, setCardSize, squareCovers, setSquareCovers, hideAvailable, setHideAvailable }}>
       {children}
     </PreferencesContext.Provider>
   );