feat: native tab panel overlay, webapp height no longer reserved

app/src/main/java/top/yeij/hearth/webview/JsBridge.kt

@@ -69,6 +69,11 @@ class JsBridge(
     // 壁纸提供接口（base64）
     // Wallpaper provider (base64)
     private val wallpaper: WallpaperProvider? = null,
+    // 标签面板回调：由 MainActivity 实现，弹出原生标签面板（PopupWindow，在内容
+    // WebView 之上，不占用预留高度）
+    // Tab panel callback implemented by MainActivity: shows a native tab panel
+    // (PopupWindow above the content WebView, no reserved height)
+    private val onShowTabPanel: (() -> Unit)? = null,
 ) {
     private val gson = com.google.gson.Gson()
 
@@ -212,6 +217,14 @@ class JsBridge(
         Log.d("HearthBridge", "hideWebApps called")
     }
 
+    // 弹出原生标签面板（H5 顶栏标签按钮点击时调用）
+    // Show the native tab panel (called when the H5 topbar tab button is tapped)
+    @android.webkit.JavascriptInterface
+    fun showTabPanel() {
+        Log.d("HearthBridge", "showTabPanel called")
+        onShowTabPanel?.invoke()
+    }
+
     // 清单内存缓存：首次拉取成功后缓存，后续复用（避免 openWebApp 重复 I/O）
     // 空结果（离线失败）不缓存，下次调用重试拉取，避免空清单被永久缓存
     // In-memory manifest cache: cache only on a successful non-empty fetch (avoid