v1.12.0

[1.12.0] - 2026-08-04

Bug Fixes

• Don't let pre-restore auto-export clobber the WebDAV backup being restored
• Make page width consistent across screens and remove horizontal table scrolling
• Prevent dropdown overflow with long labels
• Silence unnecessary_underscores lint in student_detail_screen

Features

• Attach device identity to WebDAV backups
• Add a best-effort WebDAV sync lock around export
• Detect conflicting WebDAV backups instead of silently overwriting
• Add a foreground safety-net export timer and a visual backup status button

Miscellaneous Tasks

• Remove dead code and fix broken lesson repository test

Styling

• Use null-aware collection elements (dart fix)