perf: eliminate global JS bloat and defer autoPlay video

- Dynamically imported ToolCoordinator dependencies
- Removes ~400KB from global layout (html2canvas, framer-motion)
- Implemented IntersectionObserver in VideoSection
- Prevents 1.8MB .webm autoPlay blocking initial network
- Restored SSR hydration visibility for LCP elements in Hero

package.json

@@ -49,6 +49,7 @@
     "@lhci/cli": "^0.15.1",
     "@mintel/eslint-config": "1.8.3",
     "@mintel/tsconfig": "1.8.3",
+    "@next/bundle-analyzer": "^16.1.6",
     "@remotion/cli": "^4.0.421",
     "@remotion/google-fonts": "^4.0.421",
     "@remotion/player": "^4.0.421",