Simplify hero backgrounds and add entrance animations

- Replace animated blob/wave/noise backdrop with clean static gradient
  (radial ellipse highlights + linear fade) in hero-motion-backdrop
- Remove all framer-motion from background layer; delete unused CSS
  classes: hero-blob, hero-sheet-glow, hero-sheet-wave, hero-sheet-noise,
  hero-title-shift keyframe, and responsive blob media queries
- Add framer-motion stagger entrance to HeroContentMotion, HeroMotionItem,
  and HeroTitle (slide-up + fade on mount)
- Refactor coming-soon page to use HeroContentMotion/HeroMotionItem
  instead of MotionFade (whileInView unreliable above the fold)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

components/layout/site-hero.tsx

@@ -3,11 +3,28 @@
 import type { ReactNode } from "react";
 
 import { ArrowDown } from "lucide-react";
+import { motion } from "framer-motion";
 
 import { Container } from "@/components/layout/container";
 import { HeroMotionBackdrop } from "@/components/layout/hero-motion-backdrop";
 import { cn } from "@/lib/utils";
 
+const heroItemVariants = {
+  hidden: { opacity: 0, y: 16 },
+  visible: {
+    opacity: 1,
+    y: 0,
+    transition: { duration: 0.54, ease: [0.22, 1, 0.36, 1] as [number, number, number, number] },
+  },
+};
+
+const heroContainerVariants = {
+  hidden: {},
+  visible: {
+    transition: { staggerChildren: 0.13, delayChildren: 0.08 },
+  },
+};
+
 type HeroTone = "default" | "accent" | "soft";
 type HeroLineAlign = "start" | "center" | "end";
 
@@ -119,14 +136,27 @@ export function HeroContentMotion({
   children,
   className,
 }: HeroContentMotionProps) {
-  return <div className={className}>{children}</div>;
+  return (
+    <motion.div
+      className={className}
+      initial="hidden"
+      animate="visible"
+      variants={heroContainerVariants}
+    >
+      {children}
+    </motion.div>
+  );
 }
 
 export function HeroMotionItem({
   children,
   className,
 }: HeroContentMotionProps) {
-  return <div className={className}>{children}</div>;
+  return (
+    <motion.div className={className} variants={heroItemVariants}>
+      {children}
+    </motion.div>
+  );
 }
 
 export function HeroTitle({
@@ -147,7 +177,7 @@ export function HeroTitle({
   );
 
   return (
-    <h1 className={titleClassName}>
+    <motion.h1 className={titleClassName} variants={heroItemVariants}>
       {lines.map((line, index) => (
         <span
           key={`${index}-${line.text}`}
@@ -172,7 +202,7 @@ export function HeroTitle({
               )}
         </span>
       ))}
-    </h1>
+    </motion.h1>
   );
 }