feat(website): responsive / mobile layouts

Make the marketing site mobile-friendly across every page and section.
Desktop appearance is unchanged; all breakpoint logic targets <=768px.

- Fluid section padding via clamp(); equal grids use auto-fit/minmax,
  asymmetric grids stack to one column via scoped-CSS media queries
- Nav: real hamburger menu on mobile (links, lang toggle, login, CTA)
- ProductMockup: scales the whole dashboard to fit (zoom) instead of
  reflowing its internals into a tall stack
- Lower oversized heading clamp() minimums so titles no longer overflow
  at ~390px (hero, page headers, final CTA, brand cover/chapter)
- HowItWorks: row-gap when steps stack so node markers clear the text
- Compare + partners tables: stacked rows now label each value with its
  column (Dezky vs hyperscaler / CSP) instead of an ambiguous header
- Footer columns, tiers, calculator and tables stack cleanly on mobile

apps/website/pages/about.vue

@@ -1,3 +1,14 @@
+<style scoped>
+.about-body-grid {
+  grid-template-columns: 1.2fr 1fr;
+}
+@media (max-width: 768px) {
+  .about-body-grid {
+    grid-template-columns: 1fr;
+  }
+}
+</style>
+
 <script setup lang="ts">
 import { useTheme, useCopy } from '~/composables/useLanding'
 
@@ -13,8 +24,8 @@ useHead({ title: () => `${copy.value.pages.about.label} · dezky` })
 <template>
   <LandingPageHeader :label="c.label" :title="c.title" :intro="c.intro" />
 
-  <LandingContainer pad="64px 64px 160px">
-    <div :style="{ display: 'grid', gridTemplateColumns: '1.2fr 1fr', gap: '80px', alignItems: 'start' }">
+  <LandingContainer pad="clamp(56px, 8vw, 64px) clamp(20px, 5vw, 64px) clamp(80px, 12vw, 160px)">
+    <div class="about-body-grid" :style="{ display: 'grid', gap: '80px', alignItems: 'start' }">
       <div :style="{ display: 'flex', flexDirection: 'column', gap: '24px' }">
         <p
           v-for="(para, i) in c.body" :key="i"