added theme sharing to providers and api

filcnaplo/lib/models/shared_theme.dart

@@ -0,0 +1,33 @@
+import 'dart:ui';
+
+class SharedTheme {
+  Map json;
+  String id;
+  bool isPublic;
+  String nickname;
+  Color backgroundColor;
+  Color panelsColor;
+  Color accentColor;
+
+  SharedTheme({
+    required this.json,
+    required this.id,
+    this.isPublic = false,
+    this.nickname = 'Anonymous',
+    required this.backgroundColor,
+    required this.panelsColor,
+    required this.accentColor,
+  });
+
+  factory SharedTheme.fromJson(Map json) {
+    return SharedTheme(
+      json: json,
+      id: json['public_id'],
+      isPublic: json['is_public'] ?? false,
+      nickname: json['nickname'] ?? 'Anonymous',
+      backgroundColor: json['background_color'],
+      panelsColor: json['panels_color'],
+      accentColor: json['accent_color'],
+    );
+  }
+}