fix: skip changelog popup for first-time users to avoid overlapping with tutorial

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: Hongzhi Wen

static/app.js

@@ -250,9 +250,12 @@ window.addEventListener('load', () => {
             const cr = await fetch(`/api/changelog?since=${encodeURIComponent(lastVer)}&lang=${encodeURIComponent(lang)}`);
             const cdata = await cr.json();
             let entries = cdata.entries || [];
-            // 全新用户（无历史记录）只展示最新一条，避免堆积过多
-            if (!lastVer && entries.length > 1) {
-                entries = [entries[entries.length - 1]];
+            // 全新用户（无历史记录）跳过版本更新弹窗，直接记录当前版本
+            if (!lastVer) {
+                if (cdata.current_version) {
+                    localStorage.setItem('neko_last_notified_version', cdata.current_version);
+                }
+                entries = [];
             }
             if (entries.length > 0) {
                 const changelogPromises = entries.map(entry => {