fix(desktop): header UX polish and member list improvements (#447)

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

desktop/src/features/workspaces/ui/WorkspaceSwitcher.tsx

@@ -52,7 +52,7 @@ export function WorkspaceSwitcher({
                 data-testid="workspace-switcher"
                 type="button"
               >
-                <span className="flex h-5 w-5 shrink-0 items-center justify-center rounded-md bg-primary/15 text-xs leading-none">
+                <span className="flex h-5 w-5 shrink-0 items-center justify-center text-xs leading-none">
                   🌱
                 </span>
                 <span className="min-w-0 flex-1 truncate text-sm font-medium">