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/components/landing/HowItWorks.vue

@@ -8,10 +8,10 @@ const copy = useCopy()
 
 <template>
   <section :style="{ background: t.bg, color: t.fg }">
-    <LandingContainer pad="120px 64px">
+    <LandingContainer pad="clamp(56px, 8vw, 120px) clamp(20px, 5vw, 64px)">
       <LandingSectionLabel :label="copy.how.label" />
       <h2 :style="{ fontFamily: '\'Inter Tight\', sans-serif', fontWeight: 600, fontSize: 'clamp(36px, 4.4vw, 64px)', letterSpacing: '-0.032em', lineHeight: 1.0, margin: 0, textWrap: 'balance', color: t.fg }">{{ copy.how.heading }}</h2>
-      <div :style="{ marginTop: '80px', display: 'grid', gridTemplateColumns: 'repeat(3, 1fr)', gap: '0', position: 'relative' }">
+      <div class="how-steps" :style="{ marginTop: '80px', display: 'grid', gridTemplateColumns: 'repeat(auto-fit, minmax(min(100%, 260px), 1fr))', position: 'relative' }">
         <div
           v-for="(step, i) in copy.how.steps" :key="i"
           :style="{ padding: '40px 36px 0 0', borderTop: `1px solid ${t.borderStrong}`, position: 'relative' }"
@@ -29,3 +29,12 @@ const copy = useCopy()
     </LandingContainer>
   </section>
 </template>
+
+<style scoped>
+/* Timeline steps touch (gap 0) when side-by-side. When they stack on mobile,
+   add a row gap so each step's top node marker clears the previous step's text. */
+.how-steps { gap: 0; }
+@media (max-width: 768px) {
+  .how-steps { row-gap: 52px; }
+}
+</style>