feat: Make all text in chat selectable on desktop

lib/widgets/hover_builder.dart

@@ -0,0 +1,29 @@
+import 'package:flutter/material.dart';
+
+class HoverBuilder extends StatefulWidget {
+  final Widget Function(BuildContext context, bool hovered) builder;
+  const HoverBuilder({required this.builder, super.key});
+
+  @override
+  State<HoverBuilder> createState() => _HoverBuilderState();
+}
+
+class _HoverBuilderState extends State<HoverBuilder> {
+  bool hovered = false;
+  @override
+  Widget build(BuildContext context) {
+    return MouseRegion(
+      onEnter: (_) => hovered
+          ? null
+          : setState(() {
+              hovered = true;
+            }),
+      onExit: (_) => !hovered
+          ? null
+          : setState(() {
+              hovered = false;
+            }),
+      child: widget.builder(context, hovered),
+    );
+  }
+}