refactor: change editor theme from vs to github

Author: peanut996

components/answer-area.tsx

@@ -32,7 +32,7 @@ export default function AnswerArea({ question, userAnswer, setUserAnswer, onEdit
   const textareaRef = useRef<HTMLTextAreaElement>(null)
   const [editorLanguage, setEditorLanguage] = useState("java")
   const [editorFontSize, setEditorFontSize] = useState(14)
-  const [editorTheme, setEditorTheme] = useState("vs")
+  const [editorTheme, setEditorTheme] = useState("github")
   const [isCopied, setIsCopied] = useState(false)
 
   // Detect language based on question category or content

components/monaco-editor.tsx

@@ -20,7 +20,7 @@ export default function MonacoEditor({
   language = "javascript",
   height = "300px",
   fontSize = 14,
-  theme: editorTheme = "vs",
+  theme: editorTheme = "github",
   autoFocus = false,
 }: MonacoEditorProps) {
   const editorRef = useRef<any>(null)