diff --git a/client/electron/index.html b/client/electron/index.html
index 56eaefd..1973b2c 100644
--- a/client/electron/index.html
+++ b/client/electron/index.html
@@ -13,6 +13,19 @@
     <link rel="alternate icon" type="image/x-icon" href="/assets/favicon.ico" />
     <link rel="apple-touch-icon" href="/assets/apple-touch-icon.png" />
     <meta name="theme-color" content="#2563eb" />
+    <!--
+      沉浸式（用户 2026-09-14：「不支持沉浸式网页」）。
+
+      原先没有 manifest，也没有 iOS 全屏 meta ⇒ 在手机上「添加到主屏幕」后打开，
+      看到的仍然是**带地址栏的网页**。加上 standalone + black-translucent
+      （状态栏内容叠在页面上）之后才是真正的全屏；安全区由 viewport-fit=cover
+      与 .safe-frame / .narrow-nav 的 env(safe-area-inset-*) 负责，不会被刘海挡住。
+    -->
+    <link rel="manifest" href="./manifest.webmanifest" />
+    <meta name="mobile-web-app-capable" content="yes" />
+    <meta name="apple-mobile-web-app-capable" content="yes" />
+    <meta name="apple-mobile-web-app-status-bar-style" content="black-translucent" />
+    <meta name="apple-mobile-web-app-title" content="AgentMail" />
     <title>AgentMail</title>
     <script>
       /*
diff --git a/client/electron/public/assets/icon-192.png b/client/electron/public/assets/icon-192.png
new file mode 100644
index 0000000..a48ac42
Binary files /dev/null and b/client/electron/public/assets/icon-192.png differ
diff --git a/client/electron/public/assets/icon-512.png b/client/electron/public/assets/icon-512.png
new file mode 100644
index 0000000..4e2544b
Binary files /dev/null and b/client/electron/public/assets/icon-512.png differ
diff --git a/client/electron/public/manifest.webmanifest b/client/electron/public/manifest.webmanifest
new file mode 100644
index 0000000..10c25f6
--- /dev/null
+++ b/client/electron/public/manifest.webmanifest
@@ -0,0 +1,40 @@
+{
+  "name": "AgentMail",
+  "short_name": "AgentMail",
+  "description": "以邮件为统一交互范式的多智能体协作客户端",
+  "start_url": ".",
+  "scope": ".",
+  "display": "standalone",
+  "display_override": [
+    "standalone",
+    "minimal-ui"
+  ],
+  "orientation": "any",
+  "background_color": "#f8fafc",
+  "theme_color": "#2563eb",
+  "icons": [
+    {
+      "src": "assets/icon-192.png",
+      "sizes": "192x192",
+      "type": "image/png",
+      "purpose": "any"
+    },
+    {
+      "src": "assets/icon-512.png",
+      "sizes": "512x512",
+      "type": "image/png",
+      "purpose": "any"
+    },
+    {
+      "src": "assets/icon-512.png",
+      "sizes": "512x512",
+      "type": "image/png",
+      "purpose": "maskable"
+    },
+    {
+      "src": "assets/apple-touch-icon.png",
+      "sizes": "180x180",
+      "type": "image/png"
+    }
+  ]
+}
diff --git a/client/electron/src/components/CommTabs.tsx b/client/electron/src/components/CommTabs.tsx
index 7c4fe77..b96b176 100644
--- a/client/electron/src/components/CommTabs.tsx
+++ b/client/electron/src/components/CommTabs.tsx
@@ -32,7 +32,12 @@ export default function CommTabs() {
   return (
     <div
       data-testid="comm-tabs"
-      className="shrink-0 flex items-stretch gap-0.5 px-1.5 pt-1.5 border-b border-gray-200"
+      /*
+       * 与列表头同一套观感（同内边距、同下边框），页签用**下划线**而不是浮动白胶囊。
+       * 用户（2026-09-14）：「通信页面的二级页面与其他位置极其割裂」——
+       * 之前的白胶囊带 shadow 浮在面板上，看起来是硬贴上去的另一套控件。
+       */
+      className="shrink-0 flex items-stretch gap-1 px-3 border-b border-gray-200"
       role="tablist"
       aria-label="通信"
     >
@@ -46,10 +51,10 @@ export default function CommTabs() {
             role="tab"
             aria-selected={on}
             onClick={() => setCommTab(key)}
-            className={`relative px-3 py-1.5 text-xs font-medium rounded-t-md transition-colors ${
+            className={`relative -mb-px px-3 py-3 text-xs font-medium border-b-2 transition-colors ${
               on
-                ? 'bg-white text-gray-900 shadow-sm'
-                : 'text-gray-500 hover:text-gray-800 hover:bg-white/60'
+                ? 'border-blue-600 text-gray-900'
+                : 'border-transparent text-gray-500 hover:text-gray-800 hover:border-gray-300'
             }`}
           >
             {label}
diff --git a/client/electron/test/manual/calendar-swipe-verify.mjs b/client/electron/test/manual/calendar-swipe-verify.mjs
new file mode 100644
index 0000000..05339dd
--- /dev/null
+++ b/client/electron/test/manual/calendar-swipe-verify.mjs
@@ -0,0 +1,91 @@
+/**
+ * 日历左右滑动手势验收（2026-09-14 用户：「日历页面还不支持左右滑动手势」）。
+ *
+ * 三条判据必须一起看，否则"滑一下就翻页"也能算过：
+ *   ① 左滑 → 下一段（月/周/日三种刻度都走同一个 shift()）
+ *   ② 右滑 → 回到上一段（可逆）
+ *   ③ **反向对照**：纵向拖动不翻页 —— 移动端最容易犯的手势错误就是把滚动当翻页
+ *
+ * 探针踩过的坑：标题真实格式是「2026 年 9 月」（**数字与"年月"之间有空格**），
+ * 我第一版正则写成 /^(\d{4})年(\d{1,2})月/ 匹配不到 ⇒ 返回 null ⇒ 三个值全是 null，
+ * 看起来"滑动没生效"，其实是探针瞎了。所以这里先断言标题读得到。
+ *
+ * 用法：AGENTMAIL_DIST=<dist> ADMIN_USER=.. ADMIN_PW=.. node test/manual/calendar-swipe-verify.mjs
+ */
+import { openApp } from './narrow-probe-helper.mjs';
+
+const { page, ctx } = await openApp({ width: 390, height: 844 });
+const results = [];
+const record = (name, ok, note) => {
+  results.push({ name, ok });
+  console.log(`  ${ok ? '通过' : '失败'}  ${name}${note ? ' — ' + note : ''}`);
+};
+
+try {
+  await page.waitForSelector('.narrow-nav', { timeout: 25000 });
+  await page.click('.narrow-nav button:has-text("日历")');
+  await page.waitForTimeout(1500);
+
+  const title = () =>
+    page.evaluate(() => {
+      const rx = /\d{4}\s*年\s*\d{1,2}\s*月/;
+      const c = [...document.querySelectorAll('*')]
+        .filter(e => rx.test(e.textContent) && e.children.length <= 1)
+        .map(e => e.textContent.trim())
+        .filter(t => t.length < 40)
+        .sort((a, b) => a.length - b.length);
+      return c[0] ?? null;
+    });
+
+  const swipe = (x1, y1, x2, y2) =>
+    page.evaluate(
+      ([x1, y1, x2, y2]) => {
+        const mk = (type, x, y) =>
+          new TouchEvent(type, {
+            bubbles: true,
+            cancelable: true,
+            touches:
+              type === 'touchend'
+                ? []
+                : [new Touch({ identifier: 1, target: document.body, clientX: x, clientY: y })],
+            changedTouches: [
+              new Touch({ identifier: 1, target: document.body, clientX: x, clientY: y })
+            ]
+          });
+        const el = document.elementFromPoint(x1, y1);
+        el.dispatchEvent(mk('touchstart', x1, y1));
+        el.dispatchEvent(mk('touchend', x2, y2));
+      },
+      [x1, y1, x2, y2]
+    );
+
+  const before = await title();
+  record('前置：日历标题读得到（否则本判据无意义）', !!before, `标题=${before}`);
+
+  await swipe(320, 420, 80, 420);
+  await page.waitForTimeout(900);
+  const afterLeft = await title();
+  record('① 左滑翻到下一段', !!afterLeft && afterLeft !== before, `${before} → ${afterLeft}`);
+
+  await swipe(80, 420, 320, 420);
+  await page.waitForTimeout(900);
+  const afterRight = await title();
+  record('② 右滑滑回上一段', afterRight === before, `${afterLeft} → ${afterRight}`);
+
+  await swipe(200, 300, 195, 620);
+  await page.waitForTimeout(900);
+  const afterVertical = await title();
+  record('③ 反向对照：纵向拖动不翻页', afterVertical === afterRight, `仍为 ${afterVertical}`);
+
+  // ④ 回到今天不该被手势判断干扰（按钮仍在）
+  const todayBtn = await page.locator('button:has-text("今天")').count();
+  record('④ 手势没有吃掉「今天」按钮', todayBtn > 0, `找到 ${todayBtn} 个`);
+} finally {
+  await page.close();
+  await ctx.close();
+}
+
+const failed = results.filter(r => !r.ok);
+console.log(`\n  日历滑动：${results.length - failed.length}/${results.length} 通过`);
+if (failed.length) console.log('  失败：' + failed.map(f => f.name).join('; '));
+process.exitCode = failed.length ? 1 : 0;
diff --git a/server/cmd/server/main.go b/server/cmd/server/main.go
index 9a565fc..d68587d 100644
--- a/server/cmd/server/main.go
+++ b/server/cmd/server/main.go
@@ -289,6 +289,22 @@ func main() {
 		w.Write(static.GetIndex())
 	})
 
+	// Web App Manifest（沉浸式全屏的前提：没有它，"添加到主屏幕"打开后
+	// 仍然是带地址栏的网页）。放在根路径而不是 /assets/ 下，是因为 manifest 里的
+	// start_url / scope 是相对**manifest 自己的 URL** 解析的：挂在 /assets/ 下就得写
+	// "../"，可读性差且容易被后来者改错。这里显式给一条路由（静态只挂了 / 与 /assets/*）。
+	r.Get("/manifest.webmanifest", func(w http.ResponseWriter, r *http.Request) {
+		data, err := static.ReadFile("manifest.webmanifest")
+		if err != nil {
+			http.NotFound(w, r)
+			return
+		}
+		w.Header().Set("Content-Type", "application/manifest+json")
+		// 不缓存：图标/名称/显示模式改动要能立刻生效（它只有几百字节）
+		w.Header().Set("Cache-Control", "no-cache")
+		w.Write(data)
+	})
+
 	addr := fmt.Sprintf(":%s", cfg.Port)
 	srv := &http.Server{
 		Addr:         addr,
diff --git a/server/internal/static/static.go b/server/internal/static/static.go
index 7afa845..c582bcf 100644
--- a/server/internal/static/static.go
+++ b/server/internal/static/static.go
@@ -35,3 +35,11 @@ func Handler() http.Handler {
 	sub, _ := fs.Sub(staticFS, "static")
 	return http.FileServer(http.FS(sub))
 }
+
+// ReadFile 读打包进来的静态文件（目前只给 manifest 用）。
+//
+// 用 embed 而不是读磁盘：静态根可由 --static 指定成别的目录，
+// 那时 manifest 会跟着一起"消失"；它属于前端产物的一部分，必须和应用同源同版本。
+func ReadFile(name string) ([]byte, error) {
+	return fs.ReadFile(staticFS, "static/"+name)
+}