feat(idiom): disable answer button after question is solved

resources/js/chat-room/idiom-quiz.js

@@ -75,6 +75,15 @@ function handleIdiomGameAnswered(e) {
         color: "#16a34a",
         duration: 6000,
     });
+
+    // ── 标记所有对应 round_id 的【答题】按钮为已答 ──
+    document.querySelectorAll(`[data-idiom-answer-btn="${round_id}"]`).forEach((btn) => {
+        btn.dataset.idiomAnswered = "1";
+        btn.textContent = "✅ 已答";
+        btn.style.background = "#9ca3af";
+        btn.style.cursor = "default";
+        btn.style.opacity = "0.6";
+    });
 }
 
 /**
@@ -227,6 +236,18 @@ export function bindIdiomQuizControls() {
         const btn = e.target.closest("[data-idiom-answer-btn]");
         if (!btn) return;
 
+        // 已答完的按钮不可点击
+        if (btn.dataset.idiomAnswered === "1") {
+            window.chatToast?.show({
+                title: "🧩 猜成语",
+                message: "这道题已被答过了，等下一题吧！",
+                icon: "😅",
+                color: "#9ca3af",
+                duration: 3000,
+            });
+            return;
+        }
+
         const roundId = parseInt(btn.dataset.idiomAnswerBtn || "0", 10);
         const hint = btn.dataset.idiomHint || "";
         const rewardGold = parseInt(btn.dataset.idiomGold || "0", 10);