Scroll the rooms header with the search results in room select screen

Move the "Rooms" section header inside the LazyColumn of the search results, so that it scrolls with the list
instead of staying fixed above it, as it is done for the room list when the search is not active.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

libraries/roomselect/impl/src/main/kotlin/io/element/android/libraries/roomselect/impl/RoomSelectView.kt

@@ -201,16 +201,18 @@ fun RoomSelectView(
                 resultState = state.resultState,
                 showBackButton = false,
             ) { summaries ->
-                if (summaries.isNotEmpty()) {
-                    ListSectionHeader(
-                        title = stringResource(CommonStrings.common_header_rooms),
-                        hasDivider = false,
-                    )
-                }
                 LazyColumn(
                     state = lazyListState,
                     contentPadding = lazyColumnContentPadding,
                 ) {
+                    if (summaries.isNotEmpty()) {
+                        item {
+                            ListSectionHeader(
+                                title = stringResource(CommonStrings.common_header_rooms),
+                                hasDivider = false,
+                            )
+                        }
+                    }
                     item {
                         SelectedRoomsHelper(
                             selectedRooms = state.selectedRooms,