feat: 任务队列卡片显示每个频道的日期范围

- 后端 _compute_current_task_queue 返回每项附带 download_filter
- 前端三种卡片（已完成/当前/排队中）都加一行 📅 日期范围，
  复用既有 parseFilterDisplay 解析 filter 字符串

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

module/templates/index.html

@@ -1506,16 +1506,24 @@
     const totalStr = (c.total && c.total > 0)
       ? `${c.done||0} / ${c.total} 完成`
       : `${c.done||0} 个完成`;
+    const filterLine = renderFilterLine(q.download_filter);
     return `
       <div class="qcard qcard-done">
         <div class="qcard-icon">✅</div>
         <div class="qcard-main">
           <div class="qcard-name">${title}</div>
+          ${filterLine}
           <div class="qcard-state">${totalStr}，${skipStr}</div>
         </div>
       </div>`;
   }
 
+  function renderFilterLine(filter) {
+    const txt = parseFilterDisplay(filter || '');
+    if (!txt) return '';
+    return `<div class="qcard-state" style="color:var(--muted);">${escapeHtml(txt)}</div>`;
+  }
+
   function renderActiveCard(q, p, paused) {
     const title = escapeHtml(q.chat_title || p.current_chat_title || q.chat_id);
     const dl = p.downloading_files||0, done = p.completed_files||0, skip = p.skipped_files||0;
@@ -1544,11 +1552,13 @@
         <div class="qcard-state" style="margin-top:3px;">${done} / ${realTotal}${suffix}</div>`;
     }
 
+    const filterLine = renderFilterLine(q.download_filter);
     return `
       <div class="qcard qcard-active">
         <div class="qcard-icon">🚀</div>
         <div class="qcard-main">
           <div class="qcard-name">${title}</div>
+          ${filterLine}
           <div class="qcard-state">${st}</div>
           ${progBar}
         </div>
@@ -1557,11 +1567,13 @@
 
   function renderPendingCard(q) {
     const title = escapeHtml(q.chat_title || q.chat_id);
+    const filterLine = renderFilterLine(q.download_filter);
     return `
       <div class="qcard qcard-pending">
         <div class="qcard-icon">⏳</div>
         <div class="qcard-main">
           <div class="qcard-name">${title}</div>
+          ${filterLine}
           <div class="qcard-state">排队中…</div>
         </div>
       </div>`;