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/aggregation-widget/AggregationWidgetConfigPanel.tsx

@@ -170,7 +170,7 @@ export function AggregationWidgetConfigPanel({
 
         {/* 현재 선택된 테이블 표시 (카드 형태) */}
         <div className="flex items-center gap-2 rounded-md border bg-slate-50 p-2">
-          <Database className="h-4 w-4 text-blue-500" />
+          <Database className="h-4 w-4 text-primary" />
           <div className="flex-1">
             <div className="text-xs font-medium">
               {config.customTableName || config.tableName || screenTableName || "테이블 미선택"}
@@ -224,7 +224,7 @@ export function AggregationWidgetConfigPanel({
                           !config.useCustomTable ? "opacity-100" : "opacity-0"
                         )}
                       />
-                      <Database className="mr-2 h-3 w-3 text-blue-500" />
+                      <Database className="mr-2 h-3 w-3 text-primary" />
                       {screenTableName}
                     </CommandItem>
                   </CommandGroup>