feat(ui): always use two-pane layout in landscape

app/src/main/java/com/example/research/ui/main/AdaptiveMainScreen.kt

@@ -97,7 +97,7 @@ fun AdaptiveMainScreen(
                 ) {
                     ArticleTitleBar(
                         articleState = articleState,
-                        showBackButton = isShowingDetail,
+                        showBackButton = isShowingDetail && articleState != null,
                         onNavigateBack = onNavigateBackFromArticle,
                         modifier = Modifier.windowInsetsPadding(
                             WindowInsets.safeDrawing.only(WindowInsetsSides.Top)
@@ -113,8 +113,13 @@ fun AdaptiveMainScreen(
         )
     }
 
-    LaunchedEffect(articleState, isQueryEmpty) {
+    LaunchedEffect(articleState, isQueryEmpty, isLandscape) {
         val targetValue = when {
+            isLandscape -> ThreePaneScaffoldValue(
+                primary = PaneAdaptedValue.Expanded,
+                secondary = PaneAdaptedValue.Expanded,
+                tertiary = PaneAdaptedValue.Hidden,
+            )
             articleState == null -> ThreePaneScaffoldValue(
                 primary = PaneAdaptedValue.Hidden,
                 secondary = PaneAdaptedValue.Expanded,

app/src/main/java/com/example/research/ui/navigation/AppNavigation.kt

@@ -79,6 +79,12 @@ fun AppNavigation(
         .windowSizeClass
         .isWidthAtLeastBreakpoint(WIDTH_DP_MEDIUM_LOWER_BOUND)
 
+    LaunchedEffect(isWideScreen) {
+        if (isWideScreen) {
+            screenStack.removeAll { it == Screen.Article }
+        }
+    }
+
     BackHandler(enabled = screenStack.size > 1 && !(currentScreen == Screen.Settings && isOperationActive)) {
         if (currentScreen == Screen.Article) {
             if (searchViewModel.navigateBackFromArticle()) {