feat: media card polish - per-index controls, cover jump, wrap, slide transition

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

@@ -314,21 +314,29 @@ class JsBridge(
         mediaSourceRef?.refresh()
     }
 
-    // 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)
+    // 媒体播放控制（作用于指定索引的会话，对应 H5 当前滑到的卡片）
+    // Media transport controls (act on the session at the given index, matching
+    // the card the H5 is currently showing)
     @android.webkit.JavascriptInterface
-    fun mediaPrevious() {
-        mediaSourceRef?.previous()
+    fun mediaPrevious(index: Int) {
+        mediaSourceRef?.previous(index)
     }
 
     @android.webkit.JavascriptInterface
-    fun mediaPlayPause() {
-        mediaSourceRef?.playPause()
+    fun mediaPlayPause(index: Int) {
+        mediaSourceRef?.playPause(index)
     }
 
     @android.webkit.JavascriptInterface
-    fun mediaNext() {
-        mediaSourceRef?.next()
+    fun mediaNext(index: Int) {
+        mediaSourceRef?.next(index)
+    }
+
+    // 跳转到指定会话的播放界面（封面点击）
+    // Jump to the session's playback UI (cover tap)
+    @android.webkit.JavascriptInterface
+    fun openMediaApp(index: Int) {
+        mediaSourceRef?.openMediaApp(index)
     }
 
     private fun pushMedia(infos: List<MediaInfo>, webView: android.webkit.WebView) {