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/file-upload/FileUploadComponent.tsx

@@ -35,31 +35,31 @@ const getFileIcon = (extension: string) => {
   const ext = extension.toLowerCase().replace(".", "");
 
   if (["jpg", "jpeg", "png", "gif", "bmp", "webp", "svg"].includes(ext)) {
-    return <FileImage className="h-6 w-6 text-blue-500" />;
+    return <FileImage className="h-6 w-6 text-primary" />;
   }
   if (["mp4", "avi", "mov", "wmv", "flv", "webm"].includes(ext)) {
     return <FileVideo className="h-6 w-6 text-purple-500" />;
   }
   if (["mp3", "wav", "flac", "aac", "ogg"].includes(ext)) {
-    return <FileAudio className="h-6 w-6 text-green-500" />;
+    return <FileAudio className="h-6 w-6 text-emerald-500" />;
   }
   if (["pdf"].includes(ext)) {
-    return <FileText className="h-6 w-6 text-red-500" />;
+    return <FileText className="h-6 w-6 text-destructive" />;
   }
   if (["doc", "docx", "hwp", "hwpx", "pages"].includes(ext)) {
-    return <FileText className="h-6 w-6 text-blue-600" />;
+    return <FileText className="h-6 w-6 text-primary" />;
   }
   if (["xls", "xlsx", "hcell", "numbers"].includes(ext)) {
-    return <FileText className="h-6 w-6 text-green-600" />;
+    return <FileText className="h-6 w-6 text-emerald-600" />;
   }
   if (["ppt", "pptx", "hanshow", "keynote"].includes(ext)) {
-    return <Presentation className="h-6 w-6 text-orange-500" />;
+    return <Presentation className="h-6 w-6 text-amber-500" />;
   }
   if (["zip", "rar", "7z", "tar", "gz"].includes(ext)) {
-    return <Archive className="h-6 w-6 text-gray-500" />;
+    return <Archive className="h-6 w-6 text-muted-foreground" />;
   }
 
-  return <File className="h-6 w-6 text-gray-400" />;
+  return <File className="h-6 w-6 text-muted-foreground/70" />;
 };
 
 export interface FileUploadComponentProps {