Add Stargate and Code Analysis landing pages with shared landing kit

[gabrielrangel95]

Summary

Folds the standalone Stargate and Code Analysis product sites (previously separate Next.js repos) into fluttermix.com as /stargate and /code-analysis, and adds both products to the FloatingNavbar products dropdown.

The two source sites were near-identical twins (both ported from this repo's Remix landing page — 19 of 22 files identical after sg-/ca- prefix normalization), so instead of copying them twice the landing pages share one unified kit:

• components/landing/ — shared .lp-* design system (landing.css, single copy of the former 1,291-line stylesheet), motion presets, primitives (LandingButton, Wordmark, SectionHead, HighlightedCode, WaitlistForm) and 9 sections parameterized by a LandingContent config.
• components/landing/stargate/, components/landing/code-analysis/ — per-product content configs, code snippets, and the only two genuinely divergent components each (HeroWindow, OutputsBento), plus a thin client wrapper.
• Per-product accents (violet / cyan) come from html[data-product] CSS token blocks, reusing the existing product-theming mechanism.

Navbar / theming

• Products dropdown now lists Mix, Remix, Stargate, and Code Analysis (new entries show a text label beside their square glyph — proper wordmark assets can be swapped in later).
• Landing-only products hide the Docs link, Version menu, and GitHub icon; a "Join waitlist" link takes the Docs slot.
• data-product handling extended in both the pre-hydration script (layout.jsx) and getActiveProduct, with new accent blocks in globals.css.
• Fonts need no work: both sites already consume the --font-inter / --font-jetbrains-mono vars the root layout provides.

Waitlist API

One parameterized route (/api/waitlist) serves both products with per-product Resend audiences and welcome emails. Degrades gracefully: dev no-op / prod 503 when keys are missing.

New Vercel env vars to configure:

• RESEND_API_KEY
• RESEND_AUDIENCE_ID_STARGATE
• RESEND_AUDIENCE_ID_CODE_ANALYSIS
• RESEND_FROM_EMAIL (optional; per-product defaults otherwise)

Note on zod

zod is pinned to 4.3.6 via a pnpm override: 4.4.3 breaks nextra's Layout prop validation ("expected nonoptional, received undefined at children") and 500s every route.

Verification

• pnpm build passes; /stargate and /code-analysis prerender as static routes; pagefind indexes only docs pages (landing pages also carry data-pagefind-ignore).
• Dev server: all routes 200 (/, /remix, /stargate, /code-analysis, mix/remix docs, examples); both landing pages render full section stacks with correct copy and accents.
• Waitlist API: valid posts → dev no-op 200; invalid email or unknown product → 400.

🤖 Generated with Claude Code

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[gabrielrangel95]

Superseded by an in-repo PR now that write access is granted.

[gabrielrangel95]

Adversarial review — findings & fixes

Reviewed the full diff against main, the merged landing.css against both original standalone sites, the Resend SDK source, and a production build + live smoke test. All findings below are now fixed on this branch.

#	Severity	Finding	Fix
1	High	Waitlist route ignored resend.contacts.create result; the Resend SDK never throws for API failures, so any misconfig/outage returned 200 "You're on the list" while silently losing the signup. The welcome-email try/catch was dead code for the same reason.	938e0cb — check { error } on both calls; contact failure → 502, duplicate (409) → success without re-send, failed send → logged
2	Medium	No rate limit + no dedupe: repeat POSTs sent unlimited welcome emails to any address from the Concepta domain.	938e0cb — 5 req / 10 min per IP (best-effort, per instance) + 409 dedupe stops repeat sends
3	Medium	Product dropdown rendered the Stargate / Code Analysis logos as solid white squares when inactive (brightness(0) invert(1) on opaque-background SVGs).	05c3766 — skip the white-out filter for square glyph logos
4	Low-Med	Malformed JSON body → 500 (confirmed live); should be a client error.	938e0cb — parse separately, 400
5	Low	Mobile drawer stayed open when tapping a link to the current route (pathname effect never fires).	05c3766 — explicit onClose on all internal drawer links
6	Low	vs. originals: color-scheme: dark only applied post-hydration via next-themes; ::selection accent no longer covered page chrome outside .lp-root.	f641091 — CSS color-scheme on html.dark; selection scoped by html[data-product] (page-wide on landing routes)
7	Info	twitter:card summary_large_image with no image on both landing pages (page metadata replaces the root layout's twitter/openGraph objects wholesale). Faithful to the originals, but previews were text-only.	5a66c2d — per-product opengraph-image / twitter-image via next/og

Checked and sound: CSS scoping (landing.css ships globally but every selector is inert outside the landing routes; no docs-page leakage in either direction); port fidelity (all 8 color-mix() conversions and all 14 per-product tokens are color-exact vs the originals, zero numeric drift); navbar pathname matrix + inline data-product script parity (identical predicates, no hydration mismatch in prerendered HTML); server/client boundaries (content.tsx is client-only, no serialization crossing); zod 4.3.6 override (only consumers are nextra/nextra-theme-docs at ^4.1.12 — coherent); build, typecheck, pagefind, and vercel-build.sh all unaffected.

Verified after fixes: tsc --noEmit + next build + pagefind pass; live smoke test confirms 400 on malformed JSON, 429 after the rate limit, 200 image/png on all four image routes, and og:image/twitter:image meta tags present on both pages.

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