style(ui): lists icons, section headers, active state
- Add central icon library (Icon.Sun/Activity/Star/Calendar/Eye/Inbox/Folder/Search/Plus/MoreHorizontal/GitBranch/Copy/Trash/Sort/X/Check) to IslandStyles.axaml
- Add list-section-label, search-wrap, kbd, new-list-btn, avatar-circle styles
- Add UpperCaseConverter, IconKeyConverter, DotBrushConverter; register in App.axaml
- Expose SmartLists / UserLists filtered collections from ListsIslandViewModel
- Add DotColorKey (Moss/Peat/Sage rotation) and UserInitials/UserName/MachineName props
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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