Heliobond — investor app

Sunlight made financial. The investor frontend for Heliobond, a green-bond pool on Stellar that opens green investing to everyone — from a €5 first-timer to a €5M institution.

A faithful, production-grade implementation of the Heliobond Design System handoff. The investor click-through —

landing → connect → explore → project detail → deposit → portfolio → withdraw

— plus the creator space, the internal admin / oracle console, real Stellar wallet connection, a first-class dark theme, English / French i18n, and the live WebGL Helio. It honours the brand's warm · lucid · alive brief: a two-color world (deep-pine ink on morning-air canvas) plus one solar accent, Cabinet Grotesk / Hanken Grotesk / Spline Sans Mono type.

Stack

• Next.js 16 (App Router) + React 19 + TypeScript (strict). Each screen is a real route → per-route code splitting, real URLs, SSR-ready shells.
• bun package manager / runner.
• @creit.tech/stellar-wallets-kit — multi-wallet connection (Freighter, xBull, Albedo, Lobstr, Hana, WalletConnect) on testnet.
• three + @react-three/fiber + @react-three/drei — the live Helio (WebGL/R3F).
• next-intl — EN/FR with cookie-based locale (no [locale] URL segment).
• Design tokens are plain CSS custom properties (verbatim from the handoff); components reference them via var(--token), so light/dark is a pure token swap.

Run

bun install
bun run dev        # http://localhost:3000 (Turbopack)
bun run build      # next build
bun run start      # serve the production build
bun run typecheck  # tsc --noEmit

Features

• Wallet wiring — src/wallet/WalletProvider.tsx connects a real Stellar wallet via the kit's modal and shows the live address; connectDemo() provides a placeholder session so the click-through works without an extension installed. Deposit/withdraw math flows through src/wallet/vault.ts, a simulated vault client structured for real Soroban convert_to_shares / deposit / withdraw calls once the contracts are deployed.
• Dark theme ("After Sunset") — src/theme/ provides a no-flash toggle (render-blocking bootstrap script + data-theme swap), persisted, defaulting to the OS preference. Toggle in the top bar.
• i18n (EN/FR) — src/i18n/ + messages/{en,fr}.json (117 keys each, in parity). The shell and all six investor screens are fully translated; the language switcher sets a cookie and refreshes. Design-system primitives and the new creator/admin/project-detail surfaces currently ship English (i18n-ready).
• Project detail (/project/[id]) — hero, verified-creator badge, two large sun-arc scores with on-chain score-history sparklines, funding timeline, the expandable return formula, and honest pooled-model framing.
• Creator space (/creator) — whitelist application with a status tracker, a project builder with a live ProjectCard preview, and a creator dashboard that makes the oracle's scoring legible.
• Admin / oracle console (/admin, linked from the footer) — a denser internal surface: vault stats, a sortable project registry with inline score editing, oracle "push score / fund project" forms, and whitelist management.
• Live Helio — src/brand/HelioWebGL.tsx, a soft luminous R3F orb that breathes, leans toward the cursor, and carries a per-project mote corona. src/brand/LiveHelio.tsx swaps in the static SVG <Helio> under SSR, no-WebGL, or prefers-reduced-motion. Used at the landing hero; the smaller portfolio / deposit orbs stay static by design.

Structure

src/
  app/                     App Router: layout (i18n + theme + shell), providers,
                           and route wrappers (/, connect, explore, deposit,
                           portfolio, withdraw, project/[id], creator, admin)
  brand/                   Mark (analemma), Helio (static), HelioWebGL, LiveHelio
  components/              design-system primitives (+ Sparkline)
  screens/                 Landing/Connect/Explore/Deposit/Portfolio/Withdraw,
                           ProjectDetail, creator/*, admin/*
  shell/                   TopBar (nav, theme, language, wallet), Footer
  theme/                   ThemeProvider + no-flash script
  wallet/                  WalletProvider (Stellar Wallets Kit) + vault service
  i18n/                    next-intl request config
  data.ts, data/           typed fake pool / project / creator / admin data
  styles/                  tokens (verbatim) + responsive app-shell layer
messages/                  en.json, fr.json
public/assets/             analemma marks, wordmark, favicon

Not in scope (yet)

• Real on-chain calls — the vault client is simulated (no contracts are deployed); wiring kit.signTransaction + Soroban RPC is the next step.
• Full i18n coverage — primitives and the creator/admin/project-detail surfaces are English; the pattern + catalogs are in place to extend.
• Live score-history / funding data (currently fixtures), and additional locales.

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Implemented from the Heliobond Design System handoff bundle exported from Claude Design. The reference bundle lives under .design-handoff/ (gitignored).