AnnoSync v0.1.6

Zotero 9 compatibility, deletion sync, colored highlight quotes, and robust note-annotation linking.

• Bumped strict_max_version for Zotero 9.x compatibility
• Deleting a highlight deletes its managed note, and vice versa (toggleable, on by default)
• Default quote style switched from „…" to "..."
• Quoted highlight text now carries the highlight's color (matches Zotero's own "Apply Annotation Colors")
• Annotation ↔ note link now tracked as a Zotero relation, surviving manual note edits
• Versioned startup backfill regenerates existing notes automatically on upgrade

See the open pull request to the upstream repo: koenigderorangen#2