Remove flutter chat (#26)

Had to squash merge manually as Forgejo was erroring

lib/widgets/flash_wrapper.dart

@@ -0,0 +1,20 @@
+import "package:flutter/material.dart";
+
+class FlashWrapper extends StatelessWidget {
+  final Widget child;
+  final bool isFlashing;
+  const FlashWrapper(this.child, {this.isFlashing = false, super.key});
+
+  @override
+  Widget build(BuildContext context) => ClipRRect(
+    borderRadius: BorderRadius.all(Radius.circular(12)),
+    child: AnimatedContainer(
+      padding: isFlashing ? EdgeInsets.all(8) : EdgeInsets.all(0),
+      color: isFlashing
+          ? Theme.of(context).colorScheme.onSurface.withAlpha(50)
+          : Colors.transparent,
+      duration: Duration(milliseconds: 250),
+      child: child,
+    ),
+  );
+}