feat: emote selection

Signed-off-by: dom <githubaccount56556@proton.me>

lib/common/widgets/emote_span.dart

@@ -0,0 +1,15 @@
+import 'package:flutter/widgets.dart' show WidgetSpan;
+
+class EmoteSpan extends WidgetSpan {
+  const EmoteSpan({
+    required super.child,
+    super.alignment,
+    super.baseline,
+    super.style,
+    this.rawText,
+  });
+
+  @override
+  // ignore: override_on_non_overriding_member
+  final String? rawText;
+}