Add public landing page + waitlist experience (landing/)

[arena-ai-coding-agent]

Summary

Adds a production-quality public landing page + waitlist experience for MaterialScope as a self-contained landing/ package. No product architecture changes — the only shared-file touches are housekeeping (.gitignore, pyproject.toml package list, one README pointer).

• Static site (landing/web/): zero-dependency HTML/CSS/vanilla JS built on the Dash app's own design tokens (dash_app/assets/style.css) — IBM Plex Sans/Mono, warm neutrals, sand accent, light/dark via html[data-theme] with no-flash bootstrap. Fonts self-hosted (OFL license bundled) instead of the Google CDN.
• Honest hero visual: the interactive plot panel renders real sample traces generated from sample_data/ by python -m landing.gen_traces (XRD / DSC / TGA / DTA / FTIR / Raman). Axes, units, and peak/step annotations (e.g. 43.64° 2θ · d = 2.072 Å, endothermic peak · 255 °C) are computed from the data — nothing fabricated. Crosshair readout, technique tabs, and sparkline cards all drive the same panel.
• Waitlist API (landing/server.py, FastAPI, same create_app + python -m conventions as backend/): POST /api/waitlist (pydantic contract, email validation, idempotent duplicates, honeypot, 6/min/IP sliding-window rate limit) backed by an append-only JSONL store (landing/store.py, gitignored — submissions never enter the repo). Since the product has no user database, WaitlistStore.join(email, role) -> "joined" | "already" is the single documented seam to swap in a real DB/CRM; the HTTP contract stays stable.
• No-JS fallback: the form degrades to POST /api/waitlist/form, which renders a minimal server-side result page.
• Copy reflects the repository's actual story (vendor-independent multimodal workbench; import → review → analyze → compare → export; four audiences from the product's About page; keeps the "does not replace expert validation" notice). No fake counters, testimonials, or invented features.

Motion & performance

Staggered entrance, scroll-triggered reveals, trace draw-on, damped pointer parallax, navbar condense — transform/opacity only, fully disabled under prefers-reduced-motion. Page payload ≈ 165 KB. Accessibility: semantic landmarks, labelled form fields with role=status feedback, visible focus rings, mobile sheet nav, 16px inputs (no iOS zoom).

Validation

• pytest tests/test_landing_waitlist.py — 17 tests: join/duplicate/invalid/honeypot/rate-limit, store reload + dedupe, form-encoded fallback, static serving, health.
• ruff check . --output-format concise — clean repo-wide (new-file contract in ruff.toml respected).
• 32-check jsdom smoke harness against the live server: tabs, modality cards, theme toggle, mobile sheet, form validation/submit/success/error paths, reduced-motion, missing-traces fallback. (Sandbox blocks browser downloads, so pixel review was done via the live preview + static audit rather than screenshots.)

Run

python -m landing.server --port 8090   # http://127.0.0.1:8090

Files

• landing/ — new self-contained package (server, store, generator, static site, README)
• tests/test_landing_waitlist.py — waitlist service contract tests
• pyproject.toml — include landing* + package-data; .gitignore — ignore landing/data/; README.md — one pointer section

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Project	Deployment	Actions	Updated
material-scope	Ready	Preview	Sep 4, 2026 12:22am UTC