feat: Complete light mode implementation with semantic theme system (#450)

- Add comprehensive light/dark mode CSS variables with semantic naming
- Implement theme-aware scrollbars using CSS variables
- Add light mode backgrounds: --bg-base, --bg-elevated, --bg-surface, etc.
- Add theme-aware borders: --border-base, --border-panel, --border-subtle
- Add semantic text colors: --foreground-secondary, --foreground-subtle
- Convert oklch colors to hex for better compatibility
- Add theme awareness to CodeMirror editors
- Update dark mode colors for consistency (background, sidebar, card, muted, input)
- Add Tailwind color mappings for semantic classes

Co-authored-by: Luke Gustafson <88517757+LukeGus@users.noreply.github.com>

src/ui/desktop/apps/docker/components/LogViewer.tsx

@@ -230,7 +230,7 @@ export function LogViewer({
               <SimpleLoader size="lg" />
             </div>
           ) : (
-            <div className="h-full overflow-auto">
+            <div className="h-full overflow-auto thin-scrollbar">
               <pre className="p-4 text-xs font-mono whitespace-pre-wrap break-words text-gray-200 leading-relaxed">
                 {filteredLogs || (
                   <span className="text-gray-500">No logs available</span>