feat: profile editor

closes #5

lib/widgets/avatar_upload.dart

@@ -0,0 +1,106 @@
+import 'package:cached_network_image/cached_network_image.dart';
+import 'package:flutter/material.dart';
+import 'package:image_picker/image_picker.dart';
+import 'package:zap_stream_flutter/main.dart';
+import 'package:zap_stream_flutter/theme.dart';
+
+class AvatarUpload extends StatefulWidget {
+  final String? avatar;
+  final Future<void> Function()? onUploadStart;
+  final void Function(String)? onUpload;
+
+  const AvatarUpload({
+    super.key,
+    this.onUpload,
+    this.onUploadStart,
+    this.avatar,
+  });
+
+  @override
+  State<StatefulWidget> createState() => _AvatarUpload();
+}
+
+class _AvatarUpload extends State<AvatarUpload> {
+  String? _avatar;
+  String? _error;
+  bool _loading = false;
+
+  @override
+  void initState() {
+    _avatar = widget.avatar;
+    super.initState();
+  }
+
+  Future<String?> _uploadAvatar() async {
+    if (widget.onUploadStart != null) {
+      await widget.onUploadStart!();
+    }
+    final file = await ImagePicker().pickImage(source: ImageSource.gallery);
+    if (file != null) {
+      final upload = await ndk.blossom.uploadBlob(
+        serverUrls: ["https://nostr.download"],
+        data: await file.readAsBytes(),
+      );
+      final imgUrl = upload.first.descriptor!.url;
+      setState(() {
+        _avatar = imgUrl;
+      });
+      return imgUrl;
+    }
+    return null;
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return GestureDetector(
+      onTap: () {
+        setState(() {
+          _loading = true;
+        });
+        _uploadAvatar()
+            .then((u) {
+              setState(() {
+                _loading = false;
+              });
+              if (widget.onUpload != null && u != null) {
+                widget.onUpload!(u);
+              }
+            })
+            .catchError((e) {
+              setState(() {
+                _error = e is String ? e : e.toString();
+                _loading = false;
+              });
+            });
+      },
+      child: Column(
+        spacing: 8,
+        children: [
+          Container(
+            width: 200,
+            height: 200,
+            clipBehavior: Clip.antiAlias,
+            decoration: BoxDecoration(
+              borderRadius: BorderRadius.all(Radius.circular(200)),
+              color: Color.fromARGB(100, 50, 50, 50),
+            ),
+            child:
+                _avatar == null
+                    ? Center(
+                      child:
+                          _loading
+                              ? CircularProgressIndicator()
+                              : Text("Upload Avatar"),
+                    )
+                    : CachedNetworkImage(imageUrl: _avatar!),
+          ),
+          if (_error != null)
+            Text(
+              _error!,
+              style: TextStyle(color: WARNING, fontWeight: FontWeight.bold),
+            ),
+        ],
+      ),
+    );
+  }
+}

lib/widgets/button.dart

@@ -61,7 +61,7 @@ class BasicButton extends StatelessWidget {
           onTap!();
         }
       },
-      child: (disabled ?? false) ? Opacity(opacity: 0.3, child: inner) : inner,
+      child: (disabled ?? false) ? Opacity(opacity: 0.5, child: inner) : inner,
     );
   }
 }