ZIP Import & Exports: Addressed issues during testing

- Handled links to within-zip page images found in chapter/book
  descriptions; Added test to cover.
- Fixed session showing unrelated success on failed import.

Tested import file-create undo on failure as part of this testing.

app/Exports/Controllers/ImportController.php

@@ -89,6 +89,8 @@ class ImportController extends Controller
         try {
             $entity = $this->imports->runImport($import, $parent);
         } catch (ZipImportException $exception) {
+            session()->flush();
+            $this->showErrorNotification(trans('errors.import_zip_failed_notification'));
             return redirect($import->getUrl())->with('import_errors', $exception->errors);
         }
 

app/Exports/ZipExports/ZipExportReferences.php

@@ -127,11 +127,12 @@ class ZipExportReferences
                 return null;
             }
 
-            // We don't expect images to be part of book/chapter content
-            if (!($exportModel instanceof ZipExportPage)) {
-                return null;
+            // Handle simple links outside of page content
+            if (!($exportModel instanceof ZipExportPage) && isset($this->images[$model->id])) {
+                return "[[bsexport:image:{$model->id}]]";
             }
 
+            // Find and include images if in visibility
             $page = $model->getPage();
             if ($page && userCan('view', $page)) {
                 if (!isset($this->images[$model->id])) {