shows room but not really

lib/helpers/extensions/link_to_mention.dart

@@ -0,0 +1,40 @@
+extension LinkToMention on String {
+  /// Extracts a Matrix identifier from this string.
+  ///
+  /// Supports:
+  /// - https://matrix.to/#/...
+  /// - matrix:roomid/...
+  /// - matrix:r/...
+  /// - matrix:u/...
+  ///
+  /// Returns the decoded identifier (e.g. "#room:matrix.org")
+  /// or null if this is not a Matrix link.
+  String? get mention {
+    final trimmed = trim();
+
+    final matrixTo = RegExp(
+      r"^https?://matrix\.to/#/([^/?#]+)",
+      caseSensitive: false,
+    );
+
+    final matrixToMatch = matrixTo.firstMatch(trimmed);
+    if (matrixToMatch != null) {
+      return Uri.decodeComponent(matrixToMatch.group(1)!);
+    }
+
+    if (trimmed.toLowerCase().startsWith("matrix:")) {
+      try {
+        final uri = Uri.parse(trimmed);
+
+        if (uri.pathSegments.isNotEmpty) {
+          final identifier = uri.pathSegments.last;
+          if (identifier.isNotEmpty) {
+            return Uri.decodeComponent(identifier);
+          }
+        }
+      } catch (_) {}
+    }
+
+    return null;
+  }
+}