feat: rebuild landing page from new Figma design (node 9505:537)

Complete redesign with 9 sections matching the updated 1920px layout:
- Header: sticky nav with globe/language toggle and Download CTA
- Hero: warm beige bg, iPhone mockup, "A Modern Way to Stay Connected"
- WhyTalkPro: 2x2 card grid with SVG icons and illustration
- CoreSystem: halftone bg, 6-card feature grid with 3D icons
- Experience: 3 vertical screenshot cards with exact Figma clip positions
- UseCases: split layout with 4 orange-header rows
- Trust: 4-column reliability features with sprite clipping and SVG dividers
- AppPreview: interactive phone carousel with prev/next fade transition
- DownloadCTA: polka-dot bg, TalkPro logo script, store badges
- Footer: logo, description, store badges, link columns

All 35 Figma assets downloaded locally (SVGs correctly named .svg).

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

public/assets/footer-android-icon.svg

@@ -0,0 +1,6 @@
+<svg preserveAspectRatio="none" width="100%" height="100%" overflow="visible" style="display: block;" viewBox="0 0 44 44" fill="none" xmlns="http://www.w3.org/2000/svg">
+<g id="Icon">
+<rect width="44" height="44" rx="12" fill="var(--fill-0, #D55F31)"/>
+<path id="Vector" d="M23.8954 10H15.6259C14.728 10 14 10.8028 14 11.793V32.207C14 33.1972 14.728 34 15.6259 34H28.3741C29.272 34 30 33.1972 30 32.207V16.7328C30 16.1165 29.7778 15.5252 29.3827 15.0895L25.3848 10.6807C24.9897 10.245 24.4536 10 23.8947 10H23.8954Z" fill="var(--fill-0, white)"/>
+</g>
+</svg>