[a11y] Add heading() to date separators.

Author: bmarty

features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/timeline/components/virtual/TimelineItemDaySeparatorView.kt

@@ -14,6 +14,8 @@ import androidx.compose.foundation.layout.wrapContentHeight
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.semantics.heading
+import androidx.compose.ui.semantics.semantics
 import androidx.compose.ui.tooling.preview.PreviewParameter
 import androidx.compose.ui.unit.dp
 import io.element.android.compound.theme.ElementTheme
@@ -36,6 +38,10 @@ internal fun TimelineItemDaySeparatorView(
         contentAlignment = Alignment.Center,
     ) {
         Text(
+            modifier = modifier
+                .semantics {
+                    heading()
+                },
             text = model.formattedDate,
             style = ElementTheme.typography.fontBodyMdMedium,
             color = ElementTheme.colors.textPrimary,

libraries/mediaviewer/impl/src/main/kotlin/io/element/android/libraries/mediaviewer/impl/gallery/ui/DateItemView.kt

@@ -11,6 +11,8 @@ import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.padding
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.semantics.heading
+import androidx.compose.ui.semantics.semantics
 import androidx.compose.ui.text.style.TextAlign
 import androidx.compose.ui.tooling.preview.PreviewParameter
 import androidx.compose.ui.unit.dp
@@ -28,7 +30,10 @@ fun DateItemView(
     Text(
         modifier = modifier
             .fillMaxWidth()
-            .padding(12.dp),
+            .padding(12.dp)
+            .semantics {
+                heading()
+            },
         text = item.formattedDate,
         textAlign = TextAlign.Center,
         style = ElementTheme.typography.fontBodyMdMedium,