merge: incorporate fix-problem-switcher-not-update (#933)

Takes all logic fixes from PR #933 (GetContestProblemList helper,
null-safe init, XSS fix, ImageEnlarger) while keeping the ↻ button UI
from this branch instead of #933's inline 'refreshList' text link.

- Removed .refreshList CSS and the inline onclick "刷新" element
- Resolved Update.json version conflict: both PRs credited under 3.3.2

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: boomzero

Update.json

@@ -3438,6 +3438,10 @@
             "UpdateDate": 1773497073852,
             "Prerelease": true,
             "UpdateContents": [
+                {
+                    "PR": 933,
+                    "Description": "Fix problem switcher not update"
+                },
                 {
                     "PR": 934,
                     "Description": "feat: add refresh button to ProblemSwitcher"

XMOJ.user.js

@@ -533,6 +533,29 @@ let RequestAPI = (Action, Data, CallBack) => {
     }
 };
 
+unsafeWindow.GetContestProblemList = async function(RefreshList) {
+    try {
+        const contestReq = await fetch("https://www.xmoj.tech/contest.php?cid=" + SearchParams.get("cid"));
+        const res = await contestReq.text();
+        if (contestReq.status === 200 && res.indexOf("比赛尚未开始或私有，不能查看题目。") === -1) {
+            const parser = new DOMParser();
+            const dom = parser.parseFromString(res, "text/html");
+            const rows = (dom.querySelector("#problemset > tbody")).rows;
+            let problemList = [];
+            for (let i = 0; i < rows.length; i++) {
+                problemList.push({
+                    "title": rows[i].children[2].innerText,
+                    "url": rows[i].children[2].children[0].href
+                });
+            }
+            localStorage.setItem("UserScript-Contest-" + SearchParams.get("cid") + "-ProblemList", JSON.stringify(problemList));
+            if (RefreshList) location.reload();
+        }
+    } catch (e) {
+        console.error(e);
+    }
+}
+
 // WebSocket Notification System
 let NotificationSocket = null;
 let NotificationSocketReconnectAttempts = 0;
@@ -1616,7 +1639,8 @@ async function main() {
                     border: 1px solid var(--bs-secondary-bg);
                     border-top: none;
                     border-radius: 0 0 0.3rem 0.3rem;
-                }`;
+                }
+                `;
                 }
                 if (UtilityEnabled("AddAnimation")) {
                     Style.innerHTML += `.status, .test-case {
@@ -2272,22 +2296,8 @@ async function main() {
                         }
                         let ContestProblemList = localStorage.getItem("UserScript-Contest-" + SearchParams.get("cid") + "-ProblemList");
                         if (ContestProblemList == null) {
-                            const contestReq = await fetch("https://www.xmoj.tech/contest.php?cid=" + SearchParams.get("cid"));
-                            const res = await contestReq.text();
-                            if (contestReq.status === 200 && res.indexOf("比赛尚未开始或私有，不能查看题目。") === -1) {
-                                const parser = new DOMParser();
-                                const dom = parser.parseFromString(res, "text/html");
-                                const rows = (dom.querySelector("#problemset > tbody")).rows;
-                                let problemList = [];
-                                for (let i = 0; i < rows.length; i++) {
-                                    problemList.push({
-                                        "title": rows[i].children[2].innerText,
-                                        "url": rows[i].children[2].children[0].href
-                                    });
-                                }
-                                localStorage.setItem("UserScript-Contest-" + SearchParams.get("cid") + "-ProblemList", JSON.stringify(problemList));
-                                ContestProblemList = JSON.stringify(problemList);
-                            }
+                            await unsafeWindow.GetContestProblemList(false);
+                            ContestProblemList = localStorage.getItem("UserScript-Contest-" + SearchParams.get("cid") + "-ProblemList");
                         }
 
                         let problemSwitcher = document.createElement("div");
@@ -6093,4 +6103,4 @@ int main()
 
 main().then(r => {
     console.log("XMOJ-Script loaded successfully!");
-});
+});