fix: handle undefined technicalLevel in cards and set glossary category

- Added null check for section.technicalLevel (defaults to 'basic')
- Prevents "Cannot read properties of undefined (reading 'charAt')" error
- Updated fix-glossary-structure.js to set category: 'getting-started'
- Moves glossary back to Getting Started section where it belongs

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

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

public/js/components/document-cards.js

@@ -234,8 +234,9 @@ class DocumentCards {
       advanced: '●'
     };
 
-    const levelIcon = levelIcons[section.technicalLevel] || '○';
-    const levelLabel = section.technicalLevel.charAt(0).toUpperCase() + section.technicalLevel.slice(1);
+    const technicalLevel = section.technicalLevel || 'basic';
+    const levelIcon = levelIcons[technicalLevel] || '○';
+    const levelLabel = technicalLevel.charAt(0).toUpperCase() + technicalLevel.slice(1);
 
     // Add soft hyphens to long titles for better wrapping
     const titleWithHyphens = this.insertSoftHyphens(section.title);

scripts/fix-glossary-structure.js

@@ -160,6 +160,7 @@ async function run() {
       {
         $set: {
           slug: 'glossary', // Normalize to lowercase
+          category: 'getting-started', // Move to Getting Started section
           sections: sections,
           translations: translations,
           content_html: markdownToHtml(en.content),