Fix accessibility: remove TalkBack reverseLayout workaround (#6392)

The LazyColumn was using reverseLayout=false when TalkBack was active to work
around a Compose accessibility traversal bug. This placed new messages at the
top of the screen, distorting the reading order for TalkBack users.

With Compose BOM 2026.06.00, reverseLayout=true now works correctly with
TalkBack traversal, so remove both workarounds:
- Always use reverseLayout=true in TimelineView
- Remove the .reversed() for expanded groups in TimelineItemGroupedEventsRow

Note: this change should be manually tested with TalkBack to verify correct
traversal order (oldest messages first, newest last).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/timeline/TimelineView.kt

@@ -77,7 +77,6 @@ import io.element.android.libraries.matrix.api.user.MatrixUser
 import io.element.android.libraries.testtags.TestTags
 import io.element.android.libraries.testtags.testTag
 import io.element.android.libraries.ui.strings.CommonStrings
-import io.element.android.libraries.ui.utils.a11y.isTalkbackActive
 import io.element.android.wysiwyg.link.Link
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.flow.collectLatest
@@ -128,9 +127,6 @@ fun TimelineView(
     val context = LocalContext.current
     val toastMessage = stringResource(CommonStrings.common_copied_to_clipboard)
     val view = LocalView.current
-    // Disable reverse layout when TalkBack is enabled to avoid incorrect ordering issues seen in the current Compose UI version
-    val useReverseLayout = !isTalkbackActive()
-
     fun inReplyToClick(eventId: EventId) {
         state.eventSink(TimelineEvent.FocusOnEvent(eventId))
     }
@@ -158,7 +154,7 @@ fun TimelineView(
                     .nestedScroll(nestedScrollConnection)
                     .testTag(TestTags.timeline),
                 state = lazyListState,
-                reverseLayout = useReverseLayout,
+                reverseLayout = true,
                 contentPadding = PaddingValues(top = 64.dp, bottom = 8.dp),
             ) {
                 items(

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

@@ -34,7 +34,6 @@ import io.element.android.libraries.designsystem.preview.PreviewsDayNight
 import io.element.android.libraries.matrix.api.core.EventId
 import io.element.android.libraries.matrix.api.timeline.Timeline
 import io.element.android.libraries.matrix.api.user.MatrixUser
-import io.element.android.libraries.ui.utils.a11y.isTalkbackActive
 import io.element.android.wysiwyg.link.Link
 
 @Composable
@@ -158,13 +157,7 @@ private fun TimelineItemGroupedEventsRowContent(
         )
         if (isExpanded) {
             Column {
-                timelineItem.events.let {
+                timelineItem.events.forEach { subGroupEvent ->
-                    if (isTalkbackActive()) {
-                        it.reversed()
-                    } else {
-                        it
-                    }
-                }.forEach { subGroupEvent ->
                     TimelineItemRow(
                         timelineMode = timelineMode,
                         timelineItem = subGroupEvent,