- Update versionCode from 19 to 20
- Update versionName from "1.7.2" to "1.8.0"
- Create F-Droid changelog for versionCode 20 (EN + DE)
- Update CHANGELOG.md with comprehensive v1.8.0 entry (all 16 features)
- Update CHANGELOG.de.md with German v1.8.0 entry
- Add commit hashes to all changelog entries for traceability
Major feature release: Widgets with interactive checklists, note/checklist
sorting, server deletion detection, sync status legend, live sync progress,
parallel downloads, checklist UX improvements, and widget text display fix.
Complete changelog lists all features with commit references.
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