Landing hero refinements: stats-as-coupons, inline CTAs, cleaner 3D model, centered loader, drop 2nd section

[BSalaeddin]

Follow-up refinements to the split hero (per review feedback), all verified locally on a prod build (desktop + mobile) with 19/19 e2e passing and all six gates green.

Changes

• Removed the second "welcome" section (the #see-it-work coupon vault) and its divider. CouponVaultSection.tsx + CouponVaultScene.tsx deleted; boundary-test allow-list updated.
• Stats are now 3 coupon-ticket cards (shared ticketNotchMask) at three different sizes, clustered under the 3D model, each counting up from 0 on load (easeOutCubic, reduced-motion safe). The old inline stat row in the left column is removed. Cards stay visible on mobile (only the WebGL box is lg:hidden), so phones keep the stats and still never mount three.
• Hero CTAs are inline on one row on desktop (reduced padding/text), stacked full-width below md.
• Cleaner 3D ticket — removed the matte stub rectangle under the perforation that read as a pasted-on panel; the ticket is now clean glass with just the notches + perforation + %.
• Loader spinner centered full-viewport (min-h-screen; the old h-full collapsed to 0 and pinned it to the top), dependency-free so it never pulls three into first-load JS.

Verification

• Prod build + next start: nav + home + visual-regression e2e 19/19 pass (--workers=1, cold cache).
• type-check / knip / lint / oxlint / prettier / unit — all green (incl. the three-lazy-boundary test).
• Desktop + mobile screenshots confirm inline CTAs, count-up coupon stats, clean model, single hero.

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