feat: add video batch upload queue

lib/upload_video/video_batch_upload_widgets.dart

@@ -0,0 +1,75 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_screenutil/flutter_screenutil.dart';
+
+class VideoBatchUploadBackButton extends StatelessWidget {
+  const VideoBatchUploadBackButton({
+    super.key,
+    required this.onTap,
+    this.iconSize = 19,
+  });
+
+  final VoidCallback onTap;
+  final double iconSize;
+
+  @override
+  Widget build(BuildContext context) {
+    return IconButton(
+      onPressed: onTap,
+      icon: Icon(
+        Icons.arrow_back_ios_new,
+        color: Colors.black,
+        size: iconSize,
+      ),
+    );
+  }
+}
+
+class VideoBatchUploadIconButton extends StatelessWidget {
+  const VideoBatchUploadIconButton({
+    super.key,
+    required this.onTap,
+    this.iconSize,
+    this.rightPadding,
+  });
+
+  final VoidCallback onTap;
+  final double? iconSize;
+  final double? rightPadding;
+
+  @override
+  Widget build(BuildContext context) {
+    return GestureDetector(
+      onTap: onTap,
+      child: Padding(
+        padding: EdgeInsets.only(right: rightPadding ?? 30.w),
+        child: Icon(
+          Icons.video_call_outlined,
+          size: iconSize ?? 50.sp,
+          color: const Color(0xFF1D1D21),
+        ),
+      ),
+    );
+  }
+}
+
+class VideoBatchUploadEmptyPlaceholder extends StatelessWidget {
+  const VideoBatchUploadEmptyPlaceholder({
+    super.key,
+    this.title = '这个视频库里还没有视频',
+  });
+
+  final String title;
+
+  @override
+  Widget build(BuildContext context) {
+    return Center(
+      child: Text(
+        title,
+        style: TextStyle(
+          fontSize: 28.sp,
+          color: const Color(0xFF8D90A0),
+        ),
+      ),
+    );
+  }
+}