[app] Setup rainbowkit and @/fonts

[junhoyeo]

Summary by CodeRabbit

• New Features

  • Wallet connection UI with connect, wrong-network, and account states (shortened address, optional balance).
  • Persistent top navigation with logo, sections, and wallet access.
  • Landing page introduced as the app's default entry.

• Style

  • Global dark theme applied.
  • Optician Sans and Instrument Sans fonts integrated.

• Chores

  • App providers added for wallet, UI, and data-fetching; major framework/runtime and React upgrades; Testnet (Hyperliquid EVM) configured.

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Walkthrough

Adds RainbowKit/Wagmi and React Query integration with providers and UI components; introduces fonts, address utilities, chain/config exports, global dark styles, Next.js webpack fallback, new landing page, and multiple core repo updates including Solady submodule, deployment scripts, contract adjustments, and documentation.

Changes

Cohort / File(s)	Summary
Repo config & submodules .gitmodules, packages/core/remappings.txt, packages/core/.gitignore	Added Solady submodule (packages/core/lib/solady), added remapping @solady/=lib/solady/src/, and adjusted .gitignore rules for out/deploy/ and broadcast.
App dependencies & build packages/app/package.json, packages/app/next.config.js	Upgraded Next.js/React/types; added @rainbow-me/rainbowkit, @tanstack/react-query, viem, wagmi; enabled webpack5 and added webpack fallback to disable @react-native-async-storage/async-storage.
App providers & entry packages/app/src/pages/_app.tsx, packages/app/next-env.d.ts	Wrapped app with WagmiProvider, RainbowKitProvider, QueryClientProvider; added NavigationBar; changed MyApp to React.FC; added TS reference to ./.next/types/routes.d.ts.
Wallet UI & navigation packages/app/src/components/ConnectButton.tsx, packages/app/src/components/NavigationBar.tsx	New ConnectButton using RainbowKit render prop (connect/chain/account states) and styled components; new top NavigationBar including logo, links, and ConnectButton.
Chains & wagmi config packages/app/src/constants/chains.ts, packages/app/src/constants/config.ts	Re-exported hyperliquidEvmTestnet from viem/chains; added exported wagmiConfig via getDefaultConfig (appName, projectId, chains, transports).
Fonts & global styles packages/app/src/fonts/index.ts, packages/app/src/styles/global.css	Added OpticianSans (local) and InstrumentSans (Google) exports; global dark theme rules for html, body (background #141b1d, color #fff).
Utilities & utils packages/app/src/utils/address.ts, packages/app/src/utils/config.ts	Added shortenAddress, isSameAddress, isNativeToken (uses viem types/zeroAddress); added typed Config and exported Config from env var.
Pages & routing packages/app/src/features/landing/LandingPage.tsx, packages/app/src/pages/index.tsx, packages/app/src/home/HomePage.tsx	Added LandingPage and changed index export to it; removed old HomePage (file deleted).
Type & tooling samples packages/core/typescript/fetch-index.ts, packages/app/next-env.d.ts	HyperliquidAPI now accepts baseUrl and sample usage updated for mainnet/testnet.
Core contracts & scripts packages/core/src/CrestManager.sol, packages/core/script/Deploy.s.sol, packages/core/script/Empty.sol, packages/core/script/DeployCrestVault.s.sol	CrestManager made chain-aware (TESTNET_CHAINID + internal usdt0TokenId/usdt0SpotIndex), adjusted arithmetic parentheses; added Deploy.s.sol deployment script and Empty helper contract; removed DeployCrestVault.s.sol.
Core deployments & config packages/core/deployments/998.json, packages/core/foundry.toml	Added deployment manifest 998.json; enabled foundry fs_permissions for ./deployments, optimizer=true, optimizer_runs=200.
Docs packages/core/README.md	Replaced short README with comprehensive architecture and operational guide for CrestVault strategy.

Sequence Diagram(s)

sequenceDiagram
  autonumber
  actor User
  participant NextApp as NextApp/_app
  participant Wagmi as WagmiProvider
  participant RK as RainbowKitProvider
  participant Nav as NavigationBar
  participant Btn as ConnectButton
  participant Wallet as Wallet

  User->>NextApp: Request page
  NextApp->>Wagmi: Initialize with wagmiConfig
  NextApp->>RK: Initialize RainbowKit (theme, modal)
  NextApp->>Nav: Render NavigationBar
  Nav->>Btn: Render ConnectButton
  User->>Btn: Click "Connect Wallet"
  Btn->>RK: Open connect modal
  RK->>Wallet: Prompt and request account
  Wallet-->>RK: Account & chain returned
  alt Unsupported chain
    Btn->>RK: Open chain modal (request switch)
    Wallet-->>RK: Chain switched
  else Connected
    Btn-->>User: Show address / balance / account menu
  end

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Estimated code review effort

🎯 4 (Complex) | ⏱️ ~45 minutes

Poem

I twitch my whiskers, code aglow,
New chains arrive, the wallets show.
A hop, a click, the modals sing,
Short tails trimmed—addresses ring.
Dark fields hum, deployments set to go 🐇

---

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[junhoyeo]

폰트

• 기본값은 Instrument Sans (_app 에서 설정됨)
• font-family: ${OpticianSans.style.fontFamily}; 이런 식으로 변경해 사용할 수 있음

[junhoyeo]

@citrusinesis RainbowKit/Wagmi/Viem (지갑 연결 위한 라이브러리) 및 폰트 설정 추가했습니다.
작업 중인 내용과 겹치시면 PR 닫고 참고만 하시면 됩니다!

[citrusinesis]

lgtm