diff --git a/frontend/m/js/pages.js b/frontend/m/js/pages.js
index 08a53c9..8e78515 100644
--- a/frontend/m/js/pages.js
+++ b/frontend/m/js/pages.js
@@ -3466,7 +3466,7 @@
   }
 
   function showToast(message) {
-    const root = document.getElementById("m-sheet-root");
+    const root = ensureSheetRoot();
     if (!root) return;
     let toast = document.getElementById("m-toast");
     if (!toast) {
@@ -4966,7 +4966,7 @@
     const page = document.querySelector(".m-page");
     if (page) {
       page.innerHTML = '<div class="m-scroll" id="m-scroll">' + html + "</div>" +
-        '<div class="m-form-bar"><button class="m-btn-primary" type="button" data-system-save-birth">保存资料</button></div>';
+        '<div class="m-form-bar"><button class="m-btn-primary" type="button" data-system-save-birth>保存资料</button></div>';
     }
   }
 
@@ -4981,7 +4981,7 @@
     const page = document.querySelector(".m-page");
     if (page) {
       page.innerHTML = '<div class="m-scroll" id="m-scroll">' + html + "</div>" +
-        '<div class="m-form-bar"><button class="m-btn-primary" type="button" data-system-save-password">更新密码</button></div>';
+        '<div class="m-form-bar"><button class="m-btn-primary" type="button" data-system-save-password>更新密码</button></div>';
     }
   }
 
@@ -5058,13 +5058,13 @@
       formFieldHtml("主模型", '<select id="m-sys-primary-model"></select>', false) +
       formFieldHtml("辅助模型", '<select id="m-sys-fallback-model"></select>', false) +
       '<div id="m-sys-model-list">' + renderModelPoolHtml(llm.models || []) + "</div>" +
-      '<button class="m-btn-primary" type="button" data-system-add-model">添加模型</button>' +
+      '<button class="m-btn-primary" type="button" data-system-add-model>添加模型</button>' +
       "</div>";
     const page = document.querySelector(".m-page");
     if (!page) return;
     const bar = tab === "models"
-      ? '<div class="m-form-bar"><button class="m-btn-primary" type="button" data-system-save-models">保存模型池</button></div>'
-      : '<div class="m-form-bar"><button class="m-btn-primary" type="button" data-system-save-market">保存行情配置</button></div>';
+      ? '<div class="m-form-bar"><button class="m-btn-primary" type="button" data-system-save-models>保存模型池</button></div>'
+      : '<div class="m-form-bar"><button class="m-btn-primary" type="button" data-system-save-market>保存行情配置</button></div>';
     page.innerHTML = adminTabHtml() + '<div class="m-scroll" id="m-scroll">' + (tab === "models" ? modelsHtml : marketHtml) + "</div>" + bar;
     if (tab === "models") updateSystemModelRoleOptions(llm.primary_model_id || "", llm.fallback_model_id || "");
   }
diff --git a/tests/e2e/mobile-app.spec.js b/tests/e2e/mobile-app.spec.js
index 991431f..e532b7e 100644
--- a/tests/e2e/mobile-app.spec.js
+++ b/tests/e2e/mobile-app.spec.js
@@ -355,6 +355,18 @@ test("system management pages render real content instead of placeholders", asyn
   await expect(page.locator("#m-sys-member-limit")).toBeVisible();
 });
 
+test("empty profile save click shows a toast instead of a dead button", async ({ page }) => {
+  await mockMobileApi(page);
+  await openMobile(page);
+  await navigateToFeature(page, "system/profile");
+  await expect(page.locator("[data-system-save-birth]")).toBeVisible();
+  await page.locator("#m-sys-birth-date").fill("");
+  await page.locator("#m-sys-birth-time").fill("");
+  await page.locator("[data-system-save-birth]").click();
+  await expect(page.locator("#m-toast.is-visible")).toBeVisible();
+  await expect(page.locator("#m-toast")).toContainText("请填写完整出生日期和时间");
+});
+
 test("non-admin cannot open system admin pages as placeholders", async ({ page }) => {
   await mockMobileApi(page, { auth: authSession("user", true) });
   await openMobile(page);
diff --git a/tests/test_mobile_system_pages.py b/tests/test_mobile_system_pages.py
index 6eb033c..4634819 100644
--- a/tests/test_mobile_system_pages.py
+++ b/tests/test_mobile_system_pages.py
@@ -57,3 +57,22 @@ class MobileSystemPagesRegressionTests(unittest.TestCase):
             'location.assign("/login/")',
         ):
             self.assertIn(marker, pages)
+
+    def test_system_boolean_attrs_do_not_have_stray_quotes(self) -> None:
+        pages = PAGES.read_text(encoding="utf-8")
+        stray = re.findall(r'data-system-[a-z-]*"(?=[>\s])', pages)
+        self.assertEqual(
+            stray,
+            [],
+            "boolean data-system attributes must not have a trailing quote before > or space",
+        )
+        for name in (
+            "data-system-save-birth",
+            "data-system-save-password",
+            "data-system-add-model",
+            "data-system-save-models",
+            "data-system-save-market",
+            "data-system-refresh",
+        ):
+            self.assertIn(name, pages)
+            self.assertNotIn(name + '">', pages)