Add Handbooks Lighton OCR example dataset

Added davanstrien/handbooks-lighton-ocr-32k-test to the example datasets list. This dataset contains National Library of Scotland handbooks processed with the LightOnOCR-0.9B model (32k vocabulary).

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

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

js/app.js

@@ -13,7 +13,8 @@ document.addEventListener('alpine:init', () => {
         exampleDatasets: [
             { id: 'davanstrien/exams-ocr', name: 'Exams OCR', description: 'Historical exam papers with VLM corrections' },
             { id: 'davanstrien/rolm-test', name: 'ROLM Test', description: 'Documents processed with RolmOCR model' },
-            { id: 'davanstrien/india-medical-ocr-test', name: 'India Medical OCR', description: 'Medical documents with NuMarkdown reasoning traces' }
+            { id: 'davanstrien/india-medical-ocr-test', name: 'India Medical OCR', description: 'Medical documents with NuMarkdown reasoning traces' },
+            { id: 'davanstrien/handbooks-lighton-ocr-32k-test', name: 'Handbooks Lighton OCR', description: 'National Library of Scotland handbooks processed with LightOnOCR-0.9B (32k vocab)' }
         ],
         
         // Navigation state