播放器: 剧集无logo时从剧集(series)获取logo

- PlayerDestination加载剧集后检查是否有logo
- 若剧集无logo，额外请求series item获取其logo tag
- 合并到剧集的imageTags中，确保播放器显示正确的艺术文字

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

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

@@ -438,6 +438,18 @@ private fun PlayerDestination(
         } catch (_: Exception) {
             null
         }
+        // If episode has no logo, fetch the series item to get its logo
+        val currentSeriesId = seriesId ?: item?.seriesId
+        if (item?.logoImageTag == null && !currentSeriesId.isNullOrBlank() && server != null && server.apiKey.isNotBlank()) {
+            try {
+                val seriesItem = EmbyRepository.getItem(server, currentSeriesId)
+                if (seriesItem?.logoImageTag != null) {
+                    item = item?.copy(
+                        imageTags = (item?.imageTags ?: emptyMap()) + mapOf("Logo" to seriesItem.logoImageTag!!)
+                    )
+                }
+            } catch (_: Exception) { /* ignore */ }
+        }
         itemLoading = false
     }