feat: media card cover, controls, live progress, multi-session swipe

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

@@ -304,7 +304,7 @@ class JsBridge(
 
     fun setMediaListener(source: MediaSessionSource, webView: android.webkit.WebView) {
         mediaSourceRef = source
-        source.start { info -> pushMedia(info, webView) }
+        source.start { infos -> pushMedia(infos, webView) }
     }
 
     // H5 页面就绪后重新拉取一次媒体：修复启动时推送早于页面渲染的时序问题
@@ -314,9 +314,26 @@ class JsBridge(
         mediaSourceRef?.refresh()
     }
 
-    private fun pushMedia(info: MediaInfo?, webView: android.webkit.WebView) {
+    // 媒体播放控制（作用于当前展示的会话）
+    // Media transport controls (act on the currently shown session)
+    @android.webkit.JavascriptInterface
+    fun mediaPrevious() {
+        mediaSourceRef?.previous()
+    }
+
+    @android.webkit.JavascriptInterface
+    fun mediaPlayPause() {
+        mediaSourceRef?.playPause()
+    }
+
+    @android.webkit.JavascriptInterface
+    fun mediaNext() {
+        mediaSourceRef?.next()
+    }
+
+    private fun pushMedia(infos: List<MediaInfo>, webView: android.webkit.WebView) {
         webView.post {
-            val json = info?.toJson() ?: "null"
+            val json = gson.toJson(infos)
             webView.evaluateJavascript(
                 "window.HearthEvents && window.HearthEvents.mediaSessionChanged($json);",
                 null