Add CBL reading list import and smart lists

[bsavage81]

Summary

• Add CBL reading-list import with review/matching flow
• Preserve missing/removed comics as reading-list placeholders
• Add tools to edit imported CBL lists, repair matches, reorder entries, and update from source CBL
• Add CBL export for simple, imported, and folder-based reading lists
• Add missing-comics view with PDF export and relink support
• Add reading-list folders and smart lists with saved rules/sort order
• Improve ComicVine/date-aware matching to avoid wrong-volume matches
• Show missing list entries with [MISSING] filename marker

Testing

• Built YACReaderLibrary successfully on Windows / Qt 6.9.3 / MSVC
• Imported CBL files with matched and missing comics
• Verified missing comics view/export
• Verified smartlist creation/editing/sorting
• Verified reading-list folders