Fixed
- [stable31] Fix/display labels with invalid colors by @backportbot[bot] in #7540
- [stable31] fix: Use strict comparaison by @backportbot[bot] in #7575
- [stable31] fix(cron): Split Card IDs into chunks by @backportbot[bot] in #7622
- [stable31] fix: rely on backend filter for upcoming cards by @backportbot[bot] in #7633
- [stable31] fix: hide upload button if user has no quota by @backportbot[bot] in #7680
- [stable31] fix: check cardId for attachment by @backportbot[bot] in #7740
- [stable31] Server-side validation for whitespace in title by @samin-z in #7784
- [stable31] owner should not get updated when updating card by @backportbot[bot] in #7854