Function addThumbnailMenuButton

renderer.js:16096–16127

(thumbnailContainer, filePath)

          console.log('Thumbnail generation cancelled, stopping process');
          window._scanThumbnailProgress = null;
          break;
        }
      }
      
      // Wait for any remaining active promises to complete
      if (activePromises.size > 0) {
        await Promise.all(Array.from(activePromises));
      }
      window._scanThumbnailProgress = null;
    } else {
      if (!background) {
        renderProgressBar.style.width = '100%';
        renderProgressText.textContent = 'All thumbnails up to date';
      }
    }
    
    // Foreground scans: reset filter UI and counts. Background scans (Docker STL Home polling, etc.) skip this.
    if (!background) {
      document.getElementById('designer-select').value = '';
      document.getElementById('parent-select').value = '';
      document.getElementById('printed-select').value = 'all';
      const newSelFg = document.getElementById('new-select');
      if (newSelFg) newSelFg.value = 'all';
      document.getElementById('tag-filter').value = '';

      const totalInDb = await window.electron.getTotalModelCount();
      await updateModelCounts(totalInDb);
    }

    // "New Models Found" prompt: run for any scan that reported new inserts (including background/server STL Home).
    if (newFilesCount > 0) {
      if (background) {
        window.disableGridRefresh = false;
      }
      const result = await window.electron.showMessageBox({