UX/UI batch: polish + delight pass

[jal-co]

Share component on X after creation/approval
Component previews on dashboard components page + purchases page
Landing page (post-waitlist)
Rebuild buttons/badges — more unique, more interface depth overall (#27 orbit)
Branded checkout pages (Stripe Checkout branding settings / embedded checkout)
Cool 404 page
Feedback modal → Discord webhook
Popover on the verified icon on component cards (explain the evidence)
Stepped domain-verify flow (wizard; investigate registrar auto-add DNS like Vercel/Cloudflare connect)

[jal-co]

Batch shipped: 404 page, share-on-X (post-submit + detail header), live previews on dashboard components/purchases rows, evidence tooltip on catalog check-marks, feedback→Discord (set DISCORD_FEEDBACK_WEBHOOK in prod). Domain-verify wizard item covered by the Domain Connect work (#65): one-click setup + honest provider discovery + DnsRecordCard.

Remaining: landing page, buttons/badges depth pass (#27), branded checkout.

[jal-co]

Audit update: most polish items landed in #68. Keep open only for remaining post-waitlist landing behavior, any explicitly scoped craft pass, and a real stepped domain experience; remove dormant marketplace-checkout polish from alpha scope.