feat: 分类页面优化，播放器详情处理当前集，首页的优化。图片导入。

lib/utils/extend/gif_header.dart

@@ -0,0 +1,37 @@
+import 'package:easy_refresh/easy_refresh.dart';
+import 'package:flutter/material.dart';
+import 'package:skywood/main/lib_file.dart';
+
+/// 自定义 GIF Header
+class GifHeader extends Header {
+  const GifHeader({
+    super.triggerOffset = 80,
+    super.clamping = false,
+    this.height = 80,
+    this.size = 74,
+  });
+
+  final double height;
+  final double size;
+
+  @override
+  Widget build(BuildContext context, IndicatorState state) {
+    if (state.mode == IndicatorMode.inactive ||
+        state.mode == IndicatorMode.processed ||
+        state.mode == IndicatorMode.done) {
+      return const SizedBox.shrink();
+    }
+
+    return SizedBox(
+      height: height,
+      child: Center(
+        child: Image.asset(
+          ConstImg.loading,
+          width: size,
+          height: size,
+          fit: BoxFit.contain,
+        ),
+      ),
+    );
+  }
+}