chore(arbeitszeitcheck): add 1.1.11 release artifacts

Add checksum and GitHub release notes files for version 1.1.11 to support App Store publication and public release documentation.

Made-with: Cursor

Author: aSoftwareByDesignRepository

release/CHECKSUMS-1.1.11.txt

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+# Checksums for arbeitszeitcheck-1.1.11.tar.gz
+
+36906daebec14cc6b30a61ec71a3de677590f8373c28afbfa85158aa94275c1e  arbeitszeitcheck-1.1.11.tar.gz
+fa5f6ff77826b9a6d87a00bc1c543181b14181057f3956e2ee5e2d89580a29dcd971671bf1b90bd744af70fd5c04995cb2cc0c6dee2d8afd37bd3f3468d008da  arbeitszeitcheck-1.1.11.tar.gz

release/GITHUB_RELEASE_NOTES_1.1.11.md

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+## Highlights
+
+- Added a dedicated manager/admin in-app view for employee absences with secure scope filtering and localized status labels.
+- Improved manager/admin UX by restructuring sidebar navigation into clearer grouped sections and reducing top-level clutter.
+- Added working time model copy flow with modal UX, safer duplicate handling, and improved localization rendering.
+
+## Security and Reliability
+
+- Hardened absence iCal mail behavior with stricter status/date guards, recipient deduplication, and privacy-safe descriptions for substitute/manager recipients.
+- Rolled back in-progress direct Nextcloud Calendar write/sync functionality; supported behavior remains optional `.ics` email attachments (no CalDAV sync).
+
+## Documentation
+
+- Updated EN/DE changelogs and user manuals to reflect manager UX changes and final calendar behavior.