- Rename: Add google and homeassistant branches to the dblclick-rename
save() handler; backend already accepted name updates for both sources
- Group icon: Pass groupIconForLocalCal(cal.id) into sidebar entries so
the group's custom icon (home/heart/work/…) shows instead of always
defaulting to the people icon
- Share icon: New share_calendar_icon field in UserSettings (+ migration)
replaces the hardcoded SHARE_ICON SVG; users pick from GROUP_ICON_KEYS
in Settings → Darstellung via a new icon-picker row
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>