fix: add confirm button for server url input

app/src/main/assets/h5/css/app.css

@@ -718,6 +718,23 @@ body.webapp-active [data-page="webapplist"] {
   outline: none;
 }
 
+/* 服务器地址确认按钮 */
+/* Server URL save button */
+.url-save {
+  flex: none;
+  padding: 6px 14px;
+  border: none;
+  border-radius: 8px;
+  background: var(--accent);
+  color: #fff;
+  font-size: 13px;
+  cursor: pointer;
+}
+
+.url-save:active {
+  opacity: 0.7;
+}
+
 /* 右侧箭头：弱化色 */
 /* Trailing arrow: dim color */
 .st-item .arrow {

app/src/main/assets/h5/js/pages/settings.js

@@ -191,17 +191,21 @@ function setupServerUrl(page) {
 
   const startEdit = (current) => {
     editing = true;
-    item.innerHTML = '<input class="url-input" id="server-url-input" value="' + (current || '').replace(/"/g, '&quot;') + '">';
+    item.innerHTML = '<input class="url-input" id="server-url-input" value="' + (current || '').replace(/"/g, '&quot;') + '">' +
+      '<button class="url-save" id="server-url-save">确认</button>';
     const input = item.querySelector('#server-url-input');
+    const saveBtn = item.querySelector('#server-url-save');
     input.focus();
     const save = () => {
-      bridge.call('setServerUrl', input.value.trim()).then(() => {
+      const v = input.value.trim();
+      if (!v) return;
+      bridge.call('setServerUrl', v).then(() => {
         editing = false;
         refresh();
       }).catch(() => {});
     };
+    saveBtn.onclick = save;
     input.onkeydown = (e) => { if (e.key === 'Enter') save(); };
-    input.onblur = () => { save(); };
   };
 
   const refresh = () => {