fix: broader regex to strip conditional prefix from followup hints

server/src/assessment/graph/nodes/grader.node.ts

@@ -255,7 +255,7 @@ Format your response as JSON:
     let followupHintMsg: AIMessage | null = null;
     if (shouldFollowUp && followupHints.length > 0) {
       let hint = followupHints[Math.min(currentFollowUpCount, followupHints.length - 1)];
-      hint = hint.replace(/^如果[^，,]*[，,]\s*追问[：:]\s*/i, '').replace(/^如果[^。]*[。]\s*/i, '');
+      hint = hint.replace(/^如果.+?追问[：:]\s*/i, '').replace(/^[""「『]|[""」』]$/g, '');
       const hintLabel = isZh
         ? `让我帮你完善一下：${hint}`
         : isJa