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

components/home/Hero.tsx

@@ -167,7 +167,7 @@ const scribbleVariants = {
 } as const;
 
 const subtitleVariants = {
-  hidden: { opacity: 0, y: 20, scale: 0.98 },
+  hidden: { opacity: 1, y: 20, scale: 0.98 },
   visible: {
     opacity: 1,
     y: 0,
@@ -177,7 +177,7 @@ const subtitleVariants = {
 } as const;
 
 const buttonContainerVariants = {
-  hidden: { opacity: 0 },
+  hidden: { opacity: 1 },
   visible: {
     opacity: 1,
     transition: {
@@ -188,7 +188,7 @@ const buttonContainerVariants = {
 } as const;
 
 const buttonVariants = {
-  hidden: { opacity: 0, y: 30, scale: 0.9 },
+  hidden: { opacity: 1, y: 30, scale: 0.9 },
   visible: {
     opacity: 1,
     y: 0,

components/home/VideoSection.tsx

@@ -1,26 +1,44 @@
+'use client';
+
+import React, { useState, useEffect, useRef } from 'react';
 import Scribble from '@/components/Scribble';
 import { useTranslations } from 'next-intl';
 
 export default function VideoSection() {
   const t = useTranslations('Home.video');
+  const [isVisible, setIsVisible] = useState(false);
+  const sectionRef = useRef<HTMLElement>(null);
+
+  useEffect(() => {
+    const observer = new IntersectionObserver(
+      ([entry]) => {
+        if (entry.isIntersecting) {
+          setIsVisible(true);
+          observer.disconnect();
+        }
+      },
+      { rootMargin: '200px' },
+    );
+
+    if (sectionRef.current) {
+      observer.observe(sectionRef.current);
+    }
+
+    return () => observer.disconnect();
+  }, []);
 
   return (
-    <section className="relative h-[70vh] overflow-hidden bg-primary">
-      <video
-        className="w-full h-full object-cover opacity-60"
-        autoPlay
-        muted
-        loop
-        playsInline
-        preload="none"
-      >
-        <source
-          src="/uploads/2024/12/making-of-metal-cable-on-factory-2023-11-27-04-55-16-utc-2.webm"
-          type="video/webm"
-        />
-      </video>
-      <div className="absolute inset-0 bg-gradient-to-b from-primary/60 via-transparent to-primary/60 flex items-center justify-center">
-        <div className="max-w-5xl px-6 text-center animate-slide-up">
+    <section ref={sectionRef} className="relative h-[70vh] overflow-hidden bg-primary">
+      {isVisible && (
+        <video className="w-full h-full object-cover opacity-60" autoPlay muted loop playsInline>
+          <source
+            src="/uploads/2024/12/making-of-metal-cable-on-factory-2023-11-27-04-55-16-utc-2.webm"
+            type="video/webm"
+          />
+        </video>
+      )}
+      <div className="absolute inset-0 bg-gradient-to-b from-primary/60 via-transparent to-primary/60 flex items-center justify-center pointer-events-none">
+        <div className="max-w-5xl px-6 text-center animate-slide-up pointer-events-auto">
           <h2 className="text-3xl md:text-4xl lg:text-5xl font-extrabold text-white leading-[1.1]">
             {t.rich('title', {
               future: (chunks) => (

components/record-mode/ToolCoordinator.tsx

@@ -2,8 +2,17 @@
 
 import React, { useState, useEffect } from 'react';
 import { useRecordMode } from './RecordModeContext';
-import { FeedbackOverlay } from '@mintel/next-feedback/FeedbackOverlay';
-import { RecordModeOverlay } from './RecordModeOverlay';
+import dynamic from 'next/dynamic';
+
+const FeedbackOverlay = dynamic(
+  () => import('@mintel/next-feedback/FeedbackOverlay').then((mod) => mod.FeedbackOverlay),
+  { ssr: false },
+);
+
+const RecordModeOverlay = dynamic(
+  () => import('./RecordModeOverlay').then((mod) => mod.RecordModeOverlay),
+  { ssr: false },
+);
 import { PickingHelper } from './PickingHelper';
 
 interface ToolCoordinatorProps {