Add photo view for thumbnails, emotes, and badges (#372)

* Add photo view for emotes and badges

* Add photo view to stream thumbnails

* Remove dismissable and use close button

* Use cached network image provider

* Add dismissible

lib/widgets/photo_view.dart

@@ -0,0 +1,43 @@
+import 'package:cached_network_image/cached_network_image.dart';
+import 'package:flutter/material.dart';
+import 'package:photo_view/photo_view.dart';
+
+class FrostyPhotoViewDialog extends StatefulWidget {
+  final String imageUrl;
+
+  const FrostyPhotoViewDialog({super.key, required this.imageUrl});
+
+  @override
+  State<FrostyPhotoViewDialog> createState() => _FrostyPhotoViewDialogState();
+}
+
+class _FrostyPhotoViewDialogState extends State<FrostyPhotoViewDialog> {
+  PhotoViewScaleState photoViewScaleState = PhotoViewScaleState.initial;
+
+  @override
+  Widget build(BuildContext context) {
+    return Stack(
+      alignment: Alignment.topCenter,
+      children: [
+        Dismissible(
+          key: const Key('photo_view_dismissible'),
+          direction: photoViewScaleState == PhotoViewScaleState.initial
+              ? DismissDirection.vertical
+              : DismissDirection.none,
+          onDismissed: Navigator.of(context).pop,
+          child: PhotoView(
+            imageProvider: CachedNetworkImageProvider(widget.imageUrl),
+            scaleStateChangedCallback: (value) =>
+                setState(() => photoViewScaleState = value),
+            backgroundDecoration:
+                const BoxDecoration(color: Colors.transparent),
+          ),
+        ),
+        IconButton(
+          icon: const Icon(Icons.close, color: Colors.white),
+          onPressed: Navigator.of(context).pop,
+        ),
+      ],
+    );
+  }
+}