feat: 完成 issue #158 交接班摘要页补充历史摘要查看（最近 10 次本地保存）

web/mobile/index.html

@@ -40,6 +40,10 @@
       </select>
       <button id="btn-gen" class="primary">生成摘要</button>
     </div>
+    <!-- issue #158：历史摘要查看（最近 10 次生成，本地保存） -->
+    <div class="row" id="brief-history-row" hidden>
+      <select id="brief-history"></select>
+    </div>
     <div id="gen-status" class="hint"></div>
   </div>
   <div id="brief"></div>

web/mobile/mobile.js

@@ -208,12 +208,51 @@ function generateBrief() {
         showEnergy: true, showTodos: true
       };
       renderBrief(brief);
+      saveBriefToHistory(brief);
     })
     .catch(function (e) { status.textContent = "生成失败：" + e.message; })
     .finally(function () { btn.disabled = false; });
 }
 
 /* ---------------- 启动 ---------------- */
+/* issue #158：历史摘要本地保存与查看（最近 10 次生成） */
+var BRIEFS_KEY = "iaop.mobile.briefs.v1";
+function getBriefHistory() {
+  try { return JSON.parse(localStorage.getItem(BRIEFS_KEY)) || []; }
+  catch (e) { return []; }
+}
+function saveBriefToHistory(p) {
+  var list = getBriefHistory();
+  list.unshift(p);
+  localStorage.setItem(BRIEFS_KEY, JSON.stringify(list.slice(0, 10)));
+  renderBriefHistory();
+}
+function renderBriefHistory() {
+  var list = getBriefHistory();
+  var row = document.getElementById("brief-history-row");
+  var sel = document.getElementById("brief-history");
+  if (!list.length) { row.hidden = true; return; }
+  row.hidden = false;
+  sel.innerHTML = "";
+  var ph = document.createElement("option");
+  ph.value = "-1"; ph.textContent = "查看历史摘要（" + list.length + " 条）…";
+  sel.appendChild(ph);
+  list.forEach(function (p, i) {
+    var opt = document.createElement("option");
+    opt.value = String(i);
+    opt.textContent = p.shift + " · " + (p.generatedAt || "").slice(0, 16).replace("T", " ");
+    sel.appendChild(opt);
+  });
+  sel.onchange = function () {
+    var idx = parseInt(sel.value, 10);
+    if (idx >= 0 && list[idx]) {
+      brief = list[idx];
+      renderBrief(brief);
+      document.getElementById("gen-status").textContent = "（查看历史摘要）";
+      document.getElementById("push-status").textContent = "";
+    }
+  };
+}
 (function init() {
   document.querySelectorAll("#tabbar .tab").forEach(function (tab) {
     tab.onclick = function () {
@@ -244,4 +283,5 @@ function generateBrief() {
   }
   document.getElementById("btn-refresh").onclick = loadPlan;
   loadPlan();
+  renderBriefHistory(); // issue #158：启动时恢复历史摘要入口
 })();