修复: 剧集播放器logo使用series ID获取

- 剧集的logo在series级别，不是episode级别
- 构建logo URL时检测是否为剧集(seriesId != id)
- 剧集使用seriesId请求logo，电影使用自身id
- 确保电视剧和电影都能正确显示emby艺术文字

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

app/src/main/kotlin/com/example/myapplication/navigation/AppNavHost.kt

@@ -499,11 +499,25 @@ private fun PlayerDestination(
         if (playbackUrl.isNullOrBlank()) playbackError = playbackUrlFailedMessage
     }
 
+    // Compute logo URL: for episodes, logo is on the series item, not the episode
+    val logoUrl = target?.let { t ->
+        val serverUrl = server?.fullUrl.orEmpty()
+        if (serverUrl.isBlank()) null
+        else {
+            val logoTag = t.logoImageTag
+            if (logoTag != null) {
+                // Use series ID for episode logos (logo lives on series, not episode)
+                val logoItemId = if (t.seriesId != null && t.id != t.seriesId) t.seriesId else t.id
+                "$serverUrl/emby/Items/$logoItemId/Images/Logo?tag=$logoTag&maxWidth=600&quality=90"
+            } else null
+        }
+    }.orEmpty()
+
     when {
         target != null -> VideoPlayerScreen(
             title = target.name,
             seriesName = target.seriesName.orEmpty(),
-            titleLogoUrl = target.getLogoUrl(server?.fullUrl.orEmpty()).orEmpty(),
+            titleLogoUrl = logoUrl,
             serverName = server?.name.orEmpty(),
             serverIconUrl = server?.iconUrl.orEmpty(),
             serverUrl = server?.fullUrl.orEmpty(),