refactor: migrate remaining components to Design System v4

111 files across 14 directories: common, tree-editor, kb-accelerator,
copilot, assistant, analytics, library, procedural, procedural-editor,
public, script-editor, ui, admin, step-library.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/src/components/admin/AdminSidebar.tsx

@@ -45,7 +45,7 @@ export function AdminSidebar({ className, onNavigate }: AdminSidebarProps) {
   return (
     <aside className={cn('flex h-full flex-col', className)}>
       <div className="p-4">
-        <h2 className="text-lg font-bold text-foreground">Admin Panel</h2>
+        <h2 className="text-lg font-bold text-[#e2e5eb]">Admin Panel</h2>
       </div>
       <nav className="flex-1 space-y-1 px-3">
         {navItems.map((item) => (
@@ -56,8 +56,8 @@ export function AdminSidebar({ className, onNavigate }: AdminSidebarProps) {
             className={cn(
               'flex items-center gap-3 rounded-md px-3 py-2 text-sm font-medium transition-colors',
               isActive(item.path, item.end)
-                ? 'bg-accent text-foreground'
-                : 'text-muted-foreground hover:bg-accent hover:text-foreground'
+                ? 'bg-accent text-[#e2e5eb]'
+                : 'text-[#848b9b] hover:bg-accent hover:text-[#e2e5eb]'
             )}
           >
             <item.icon className="h-4 w-4" />
@@ -65,13 +65,13 @@ export function AdminSidebar({ className, onNavigate }: AdminSidebarProps) {
           </Link>
         ))}
       </nav>
-      <div className="border-t border-border p-3">
+      <div className="border-t border-[#1e2130] p-3">
         <Link
           to="/trees"
           onClick={onNavigate}
           className={cn(
             'flex items-center gap-3 rounded-md px-3 py-2 text-sm font-medium',
-            'text-muted-foreground hover:bg-accent hover:text-foreground'
+            'text-[#848b9b] hover:bg-accent hover:text-[#e2e5eb]'
           )}
         >
           <ArrowLeft className="h-4 w-4" />