chore(utils): remove unused utility functions

- Remove getPath function (moved to problem-editor store)
- Remove getDifficultyColorClass function (unused)
- Keep only core cn utility function

src/lib/utils.ts

@@ -1,27 +1,6 @@
 import { twMerge } from "tailwind-merge";
 import { clsx, type ClassValue } from "clsx";
-import type { EditorLanguageConfig, Difficulty } from "@/generated/client";
 
 export function cn(...inputs: ClassValue[]) {
   return twMerge(clsx(inputs));
 }
-
-export function getPath(
-  problemId: string,
-  editorLanguageConfig: EditorLanguageConfig
-) {
-  return `file:///${problemId}/${editorLanguageConfig.fileName}${editorLanguageConfig.fileExtension}`;
-}
-
-export const getDifficultyColorClass = (difficulty: Difficulty) => {
-  switch (difficulty) {
-    case "EASY":
-      return "text-green-500";
-    case "MEDIUM":
-      return "text-yellow-500";
-    case "HARD":
-      return "text-red-500";
-    default:
-      return "text-gray-500";
-  }
-};