refactor: 전체 프론트엔드 하드코딩 색상 → CSS 변수 일괄 치환

447+ 파일, 4500+ 줄 변경:
- gray-* → border/bg-muted/text-foreground/text-muted-foreground
- blue-* → primary/ring
- red-* → destructive
- green-* → emerald (일관성)
- indigo-* → primary
- yellow/orange → amber (통일)
- dark mode 변형도 시맨틱 토큰으로 변환

Made-with: Cursor

frontend/lib/registry/components/v2-aggregation-widget/AggregationWidgetComponent.tsx

@@ -720,7 +720,7 @@ export function AggregationWidgetComponent({
             <span>{dataSourceComponentId}</span>
           )}
           {(filters || []).length > 0 && (
-            <span className="text-blue-500">필터 {filters?.length}개</span>
+            <span className="text-primary">필터 {filters?.length}개</span>
           )}
         </div>
         <div