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/components/screen/panels/FileComponentConfigPanel.tsx

@@ -1230,8 +1230,8 @@ export const FileComponentConfigPanel: React.FC<FileComponentConfigPanelProps> =
           <div className="mt-4 p-3 bg-accent border border-primary/20 rounded-lg">
             <div className="flex items-center justify-between">
               <div className="flex items-center space-x-2">
-                <div className="w-2 h-2 bg-orange-500 rounded-full animate-pulse"></div>
-                <span className="text-sm font-medium text-blue-900">
+                <div className="w-2 h-2 bg-amber-500 rounded-full animate-pulse"></div>
+                <span className="text-sm font-medium text-primary">
                   {uploadedFiles.length}개 파일이 임시 저장됨
                 </span>
               </div>