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/Sovereignty.vue

@@ -25,7 +25,7 @@ const labelParts = computed(() => {
 
 <template>
   <section id="sovereignty" :style="{ background: t.invert, color: t.invertFg, scrollMarginTop: '72px' }">
-    <LandingContainer pad="140px 64px">
+    <LandingContainer pad="clamp(56px, 8vw, 140px) clamp(20px, 5vw, 64px)">
       <div :style="{
         display: 'flex', alignItems: 'center', gap: '14px',
         paddingBottom: '24px', marginBottom: '56px',
@@ -37,7 +37,7 @@ const labelParts = computed(() => {
         <span>—</span>
         <span>{{ labelParts.text }}</span>
       </div>
-      <div :style="{ display: 'grid', gridTemplateColumns: '1.1fr 1fr', gap: '96px' }">
+      <div class="sovereignty-main-grid" :style="{ display: 'grid', gap: '96px' }">
         <div>
           <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.invertFg }">{{ copy.sovereignty.heading }}</h2>
           <div :style="{ marginTop: '36px', display: 'flex', flexDirection: 'column', gap: '18px', maxWidth: '540px' }">
@@ -47,8 +47,9 @@ const labelParts = computed(() => {
         <div :style="{ paddingTop: '8px' }">
           <div
             v-for="(row, i) in copy.sovereignty.checks" :key="i"
+            class="sovereignty-check-row"
             :style="{
-              display: 'grid', gridTemplateColumns: '1fr 1.4fr', padding: '20px 0',
+              display: 'grid', padding: '20px 0',
               borderTop: i === 0 ? `1px solid ${rule18}` : 'none',
               borderBottom: `1px solid ${rule10}`,
               fontFamily: '\'Inter\', sans-serif', fontSize: '14px', alignItems: 'baseline',
@@ -62,3 +63,23 @@ const labelParts = computed(() => {
     </LandingContainer>
   </section>
 </template>
+
+<style scoped>
+.sovereignty-main-grid {
+  grid-template-columns: 1.1fr 1fr;
+}
+
+.sovereignty-check-row {
+  grid-template-columns: 1fr 1.4fr;
+}
+
+@media (max-width: 768px) {
+  .sovereignty-main-grid {
+    grid-template-columns: 1fr;
+  }
+
+  .sovereignty-check-row {
+    grid-template-columns: 1fr;
+  }
+}
+</style>