fix: 末尾频道快照 + h-skip 累加 + 清理死代码

- 补 download_all_chat 末尾 snapshot + reset，修复最后频道永远卡「🚀下载中」
- h-skip 改为跨频道累加，解决切频道视觉归零
- 清理前端 currentFilter 死变量 / download_stat 无意义三元

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

module/templates/index.html

@@ -1115,8 +1115,6 @@
   }
 
   // ── 加载配置 ──
-  let currentFilter = '';
-
   function parseFilterDisplay(filter) {
     if (!filter) return '';
     const startM = filter.match(/message_date\s*>=\s*(\d{4}-\d{2}-\d{2})/);
@@ -1144,7 +1142,6 @@
       const el = document.getElementById('cfg-path');
       el.textContent = p; el.title = p;
       document.getElementById('path-input').value = d.save_path || '';
-      currentFilter = d.download_filter || '';
     }).catch(() => {});
   }
 
@@ -1587,7 +1584,11 @@
     }).catch(() => {});
 
     fetch('/api/task_progress').then(r => r.json()).then(p => {
-      document.getElementById('h-skip').textContent = p.skipped_files || 0;
+      // h-skip 要跨频道累加：本次运行里已完成频道的 skip 汇总 + 当前频道实时的 skipped_files
+      // 否则切频道时 reset_task_progress 会把计数清零，视觉上会「跳过数突然归零」
+      const completed = Array.isArray(p.completed_chats) ? p.completed_chats : [];
+      const completedSkip = completed.reduce((s, c) => s + (c.skip || 0), 0);
+      document.getElementById('h-skip').textContent = completedSkip + (p.skipped_files || 0);
       renderTaskQueue(p);
     }).catch(() => {});