fix(website): consistent navbar→eyebrow spacing on pricing + blog heroes (#562)

Audit of every non-docs hero (via Chrome) found 11/13 pages at a 34px
gap between the fixed navbar and the hero eyebrow, with two outliers:

- /pricing: -1px — the hero <Section> had `tight`, applying
  sectionYTight (80px) < the 81px fixed navbar, so the eyebrow rendered
  *behind* the navbar. Drop `tight` so it inherits sectionY (115.2px) =
  navbar + 34px gap.
- /blog: 63px (~2x) — the bespoke hero layout stacked outer paddingTop
  80 + inner top 64 = 144. Reduce the inner top padding to 35 (sides and
  bottom unchanged) so the eyebrow lands at 115.

Both now measure 34px, matching home/ag-ui/langgraph/render/chat/
pilot-to-prod/solutions/contact/thanks.

Author: blove

apps/website/src/app/blog/page.tsx

@@ -35,7 +35,7 @@ export default async function BlogIndexPage({ searchParams }: Props) {
 
   return (
     <div style={{ paddingTop: 80, background: tokens.surfaces.canvas, minHeight: '100vh' }}>
-      <div style={{ maxWidth: 960, margin: '0 auto', padding: '64px 24px' }}>
+      <div style={{ maxWidth: 960, margin: '0 auto', padding: '35px 24px 64px' }}>
         <header style={{ marginBottom: 32 }}>
           <Eyebrow tone="accent" style={{ marginBottom: 16 }}>
             Blog

apps/website/src/app/pricing/page.tsx

@@ -20,7 +20,7 @@ export const metadata = createPageMetadata({
 export default function PricingPage() {
   return (
     <>
-      <Section surface="canvas" tight ariaLabelledBy="pricing-heading">
+      <Section surface="canvas" ariaLabelledBy="pricing-heading">
         <Container>
           <div style={{ textAlign: 'center', maxWidth: 760, margin: '0 auto' }}>
             <Eyebrow tone="accent" style={{ marginBottom: 16 }}>Pricing</Eyebrow>