* Add customizable sidebar selection highlight color
Expose a `sidebarSelectionColorHex` user default that overrides the
hardcoded blue (#0091FF) selection highlight in the sidebar. Add a
"Selection Highlight" color picker in Settings > Workspace Colors,
following the same pattern as existing tint color pickers. Falls back
to the default accent color when no custom color is set.
Closes#1753
* Fix review feedback: reactivity, reset button, localization
- Add @AppStorage subscription in TabItemView so sidebar selection
color updates reactively when changed in Settings
- Add Reset button in Settings > Workspace Colors > Selection Highlight
- Localize debug panel strings for Selection Color picker
- Clear sidebarSelectionColorHex in resetAllSettings()
* Add customizable notification badge color in sidebar
Add `sidebarNotificationBadgeColorHex` user default to override the
unread notification badge color on workspace tabs. Add a "Notification
Badge" color picker in Settings > Workspace Colors, following the same
pattern as the selection highlight picker. Falls back to the default
accent color when no custom color is set.
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