[a11y] Ensure that heading() is applied to all screen titles.

features/joinroom/impl/src/main/kotlin/io/element/android/features/joinroom/impl/JoinRoomView.kt

@@ -31,6 +31,8 @@ import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.semantics.heading
+import androidx.compose.ui.semantics.semantics
 import androidx.compose.ui.text.font.FontStyle
 import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.tooling.preview.PreviewParameter
@@ -577,7 +579,11 @@ private fun JoinRoomTopBar(
                             avatarType = AvatarType.Room(),
                         )
                         Text(
-                            modifier = Modifier.padding(horizontal = 8.dp),
+                            modifier = Modifier
+                                .padding(horizontal = 8.dp)
+                                .semantics {
+                                    heading()
+                                },
                             text = contentState.name,
                             style = ElementTheme.typography.fontBodyLgMedium,
                             maxLines = 1,