fix: use PlatformSettings for pagination in Letzshop page

- Load rows per page from PlatformSettings in init()
- Apply setting to ordersLimit, exceptionsLimit, productsLimit, jobsPagination
- Replace alert() with Utils.showToast() for error display
- Improve viewJobErrors to show errors in modal instead of alert
- Update architecture validator to catch non-standard pagination patterns
  (jobsPagination, ordersLimit, etc.)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

static/admin/js/marketplace-letzshop.js

@@ -150,6 +150,16 @@ function adminMarketplaceLetzshop() {
             }
             window._marketplaceLetzshopInitialized = true;
 
+            // Load platform settings for pagination
+            if (window.PlatformSettings) {
+                const rowsPerPage = await window.PlatformSettings.getRowsPerPage();
+                this.ordersLimit = rowsPerPage;
+                this.exceptionsLimit = rowsPerPage;
+                this.productsLimit = rowsPerPage;
+                this.jobsPagination.per_page = rowsPerPage;
+                marketplaceLetzshopLog.info('Loaded rows per page setting:', rowsPerPage);
+            }
+
             // Initialize Tom Select after a short delay to ensure DOM is ready
             this.$nextTick(() => {
                 this.initTomSelect();
@@ -1466,26 +1476,32 @@ function adminMarketplaceLetzshop() {
          * View job errors
          */
         async viewJobErrors(job) {
-            if (job.type !== 'import') return;
+            if (job.type !== 'import' && job.type !== 'historical_import') return;
 
             try {
-                const response = await apiClient.get(`/admin/marketplace-import-jobs/${job.id}/errors`);
-                const errors = response.errors || [];
+                const endpoint = job.type === 'import'
+                    ? `/admin/marketplace-import-jobs/${job.id}/errors`
+                    : `/admin/letzshop/historical-imports/${job.id}`;
 
-                if (errors.length === 0) {
-                    alert('No error details available');
-                    return;
+                const response = await apiClient.get(endpoint);
+
+                if (job.type === 'import') {
+                    const errors = response.errors || [];
+                    if (errors.length === 0) {
+                        Utils.showToast('No error details available', 'info');
+                        return;
+                    }
+                    // Store errors and show in job details modal
+                    this.selectedJobDetails = { ...job, errors: errors.slice(0, 20) };
+                    this.showJobDetailsModal = true;
+                } else {
+                    // Historical import - show job details
+                    this.selectedJobDetails = { ...job, ...response };
+                    this.showJobDetailsModal = true;
                 }
-
-                // Show errors in alert for now
-                const errorText = errors.slice(0, 10).map(e =>
-                    `Row ${e.row_number}: ${e.error_message}`
-                ).join('\n');
-
-                alert(`Import Errors (showing first 10):\n\n${errorText}`);
             } catch (error) {
                 marketplaceLetzshopLog.error('Failed to load job errors:', error);
-                this.error = 'Failed to load error details';
+                Utils.showToast('Failed to load error details', 'error');
             }
         },