If in viewer load latest file in viewer (#5784)

frontend/src/core/utils/homePageNavigation.ts

@@ -13,37 +13,25 @@ export function getStartupNavigationAction(
   selectedToolKey: string | null,
   currentWorkbench: WorkbenchType
 ): StartupNavigationAction | null {
-  console.log('[homePageNavigation] Called with:', {
-    previousFileCount,
-    currentFileCount,
-    selectedToolKey,
-    currentWorkbench,
-  });
-
   // pdfTextEditor handles its own empty state
   if (selectedToolKey === 'pdfTextEditor') {
-    console.log('[homePageNavigation] pdfTextEditor detected, returning null');
     return null;
   }
 
-  // Only handle transitions from empty (0 files) to some files
-  if (previousFileCount !== 0) {
-    console.log('[homePageNavigation] Not a 0→N transition, returning null');
-    return null;
+  // Already actively viewing in the viewer → update to the latest file
+  if (previousFileCount > 0 && currentWorkbench === 'viewer' && currentFileCount > previousFileCount) {
+    return { workbench: 'viewer', activeFileIndex: currentFileCount - 1 };
   }
 
-  // 0→1: Go to viewer to view the single file
-  if (currentFileCount === 1) {
-    console.log('[homePageNavigation] 0→1 transition, returning viewer');
-    return { workbench: 'viewer', activeFileIndex: 0 };
+  // From landing page (no prior files)
+  if (previousFileCount === 0) {
+    if (currentFileCount === 1) {
+      return { workbench: 'viewer', activeFileIndex: 0 };
+    }
+    if (currentFileCount > 1) {
+      return { workbench: 'fileEditor' };
+    }
   }
 
-  // 0→N (N>1): Go to fileEditor to manage multiple files
-  if (currentFileCount > 1) {
-    console.log('[homePageNavigation] 0→N transition, returning fileEditor');
-    return { workbench: 'fileEditor' };
-  }
-
-  console.log('[homePageNavigation] Still at 0 files, returning null');
   return null;
 }