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/table-options/TableSettingsModal.tsx

@@ -388,7 +388,7 @@ export const TableSettingsModal: React.FC<Props> = ({ isOpen, onClose, onFilters
                         onDragEnd={() => setDraggedColumnIndex(null)}
                         className={`flex cursor-move items-center gap-3 rounded-lg border p-3 transition-colors ${
                           isFrozen
-                            ? "border-blue-200 bg-blue-50 dark:border-blue-800 dark:bg-blue-950/30"
+                            ? "border-primary/20 bg-primary/10 dark:border-primary/30 dark:bg-primary/15/30"
                             : "bg-background hover:bg-muted/50"
                         }`}
                       >
@@ -405,7 +405,7 @@ export const TableSettingsModal: React.FC<Props> = ({ isOpen, onClose, onFilters
 
                         {/* 가시성/틀고정 아이콘 */}
                         {isFrozen ? (
-                          <Lock className="h-4 w-4 shrink-0 text-blue-500" />
+                          <Lock className="h-4 w-4 shrink-0 text-primary" />
                         ) : col.visible ? (
                           <Eye className="text-primary h-4 w-4 shrink-0" />
                         ) : (
@@ -419,7 +419,7 @@ export const TableSettingsModal: React.FC<Props> = ({ isOpen, onClose, onFilters
                               {originalCol.columnLabel}
                             </span>
                             {isFrozen && (
-                              <span className="text-[10px] font-medium text-blue-600 dark:text-blue-400">
+                              <span className="text-[10px] font-medium text-primary dark:text-primary/80">
                                 (고정)
                               </span>
                             )}