Implement chapter transfer functionality and enhance routing

- Added a new API endpoint for transferring selected chapters to a specified directory, including error handling and feedback for users.
- Introduced a new TitlePage component to display detailed information about a title and its chapters, including transfer options.
- Updated routing logic to support navigation to individual title pages, improving user experience.
- Refactored existing components to streamline state management and enhance modularity.
- Enhanced UI elements for better interaction, including checkboxes for selecting chapters and improved error/success messaging.

docker-compose.yml

@@ -6,6 +6,8 @@ services:
     environment:
       PORT: "3000"
       DATA_DIR: /app/data
+      # Softlink destination for Transfer (default: $DATA_DIR/transfers).
+      # TRANSFER_DIR: /app/data/transfers
       # Wake hourly; sync at most one due title per wake.
       WATCH_CRON: "0 * * * *"
       # Each title is eligible again after this many hours (daily).