[Feature] BookDrop should honor the destination library’s “Book Per Folder” organization mode

[theaaronturner]

Description

When multiple formats of the same book are placed together in one BookDrop folder, BookDrop stages and imports each format as a separate book.

The destination library is configured with the Book Per Folder organization mode. Normal library scanning groups files sharing the same immediate parent folder into one book with multiple formats, but BookDrop finalization does not appear to apply that behavior.

Environment

• BookLore version: v2.3.1
• Deployment: Docker Compose
• Database: MariaDB 11.4
• Destination library organization mode: Book Per Folder

Steps to reproduce

1. Create a library using the Book Per Folder organization mode.

2. Create one BookDrop folder containing multiple formats of the same title:

   Example Book/
   ├── Example Book.epub
   ├── Example Book.mobi
   └── Example Book.azw3

3. Allow BookDrop to process the files.

4. Assign all formats to the same destination library.

5. Finalize the import.

Actual behavior

BookDrop creates three separate book records. They must subsequently be merged manually.

Expected behavior

Because the destination library uses Book Per Folder, BookDrop should import the files as one book record with EPUB, MOBI, and AZW3 attached as alternate formats.

Suggested implementation options

Any of the following would improve this workflow:

1. Preserve the BookDrop folder relationship and apply the destination library’s organization mode during finalization.
2. Automatically recognize matching formats selected for the same destination library.
3. Provide a Combine selected files as formats of one book action in BookDrop before finalization.

Additional context

Normal library-folder scanning groups these files correctly. The discrepancy appears specific to the BookDrop staging and finalization workflow.

This becomes especially cumbersome when migrating an existing multi-format library because every title requires a separate manual merge.