Segment demo video by scene with embedded GIF segments (#990)

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: thomasnordquist <7721625+thomasnordquist@users.noreply.github.com>

scripts/generateMarkdownSummary.js

@@ -0,0 +1,45 @@
+#!/usr/bin/env node
+const fs = require('fs');
+
+// Read scenes.json
+const scenes = JSON.parse(fs.readFileSync('scenes.json', 'utf8'));
+
+// Get base URL from command line arguments
+const baseUrl = process.argv[2];
+
+if (!baseUrl) {
+  console.error('Usage: node generateMarkdownSummary.js <base-url>');
+  process.exit(1);
+}
+
+// Sanitize scene name to prevent path traversal
+function sanitizeName(name) {
+  // Remove any characters that aren't alphanumeric, dash, or underscore
+  return name.replace(/[^a-zA-Z0-9_-]/g, '-');
+}
+
+// Generate markdown
+let markdown = '## 🎬 Demo Video Generated\n\n';
+markdown += `### Full Video\n\n`;
+markdown += `[📥 Download Full Video (MP4)](${baseUrl}/ui-test.mp4) | [GIF](${baseUrl}/ui-test.gif)\n\n`;
+markdown += `---\n\n`;
+markdown += `### 📑 Video Segments\n\n`;
+markdown += `<details>\n`;
+markdown += `<summary>Click to expand segments</summary>\n\n`;
+
+scenes.forEach((scene, index) => {
+  const safeName = sanitizeName(scene.name);
+  const segmentFile = `segment-${String(index + 1).padStart(2, '0')}-${safeName}.gif`;
+  const title = scene.title || scene.name;
+  const duration = (scene.duration / 1000).toFixed(1);
+  
+  markdown += `<details>\n`;
+  markdown += `<summary><strong>${index + 1}. ${title}</strong> (${duration}s)</summary>\n\n`;
+  markdown += `![${title}](${baseUrl}/${segmentFile})\n\n`;
+  markdown += `</details>\n\n`;
+});
+
+markdown += `</details>\n\n`;
+markdown += `_Videos will expire in 90 days._`;
+
+console.log(markdown);