Fixed missing onSearchClick prop destructuring in ChapterSelector

- **Destructured onSearchClick**: Added to props in ChapterSelector component
- **Prop passthrough**: Added onSearchClick={() => setShowSearch(true)} to ChapterSelector call in App.tsx
- **Build fix**: Resolved TS error preventing Docker build success
- **Search infrastructure**: Ready for ChapterSelector search bar implementation if needed later

Docker build will now succeed!

frontend/src/components/ChapterSelector.tsx

@@ -13,7 +13,7 @@ interface ChapterSelectorProps {
   onSearchClick?: () => void;
 }
 
-const ChapterSelector: React.FC<ChapterSelectorProps> = ({ book, onChapterSelect, onBack, formatBookName, user, onFavoriteChange, version = 'esv' }) => {
+const ChapterSelector: React.FC<ChapterSelectorProps> = ({ book, onChapterSelect, onBack, formatBookName, user, onFavoriteChange, version = 'esv', onSearchClick }) => {
   const [chapters, setChapters] = useState<string[]>([]);
   const [loading, setLoading] = useState(true);
   const [favorites, setFavorites] = useState<Set<string>>(new Set());