BaseBoard multi-chain (Base + Celo): unified wallet modal, Celo pricing/deploy, pixel links + content guard

[devin-ai-integration]

Summary

Unified implementation of the full Base + Celo multi-chain architecture plus this round's requests. Supersedes #2 (do not merge #2). Base's shipped optimizations — bbox compression ladder, 9,500-block progressive log scan, optimistic canvas updates — are untouched and run on both chains.

Celo is now live. BaseBoard is deployed to Celo Mainnet (42220) at 0x7b5E66cD88305aB33CE2c2C400167B7fFF348a23 (deploy block 69652905), with on-chain PLOT_PRICE = 1.3 CELO and TREASURY = 0x71aad…812b (verified on-chain). The real address + deploy block are baked into the config defaults (still env-overridable); the placeholder is gone.

1. Wallet UI — single "Connect Wallet" button + modal

Reverted the inline raw-connector buttons. Disconnected state is now one clean Connect Wallet button that opens a selection modal. Coinbase Smart Wallet is offered everywhere except Celo (unsupported), where users are steered to MetaMask / Rabby / WalletConnect.

disconnected → [Connect Wallet] → Modal:
  - Coinbase Smart Wallet   (hidden when chainId === 42220)
  - MetaMask / Rabby / Browser Wallet  (injected)
  - WalletConnect           (when projectId configured)

2. Pricing

• Base (8453): 0.00005 ETH per plot (unchanged).
• Celo (42220): 1.3 CELO per plot (~0.1 USDC equiv).

3. Contract parametrized + deployed to Celo

PLOT_PRICE and TREASURY were hardcoded constants with no constructor — so the "deploy the existing contract" path could not set 1.3 CELO or the requested treasury. They are now immutable constructor args (public getters preserved, so the frontend ABI reads are unchanged):

constructor(uint256 plotPrice, address payable treasury) { ... }

• scripts/deploy-celo.cjs deployed with 1.3 CELO + treasury 0x71aad…812b, captured the deploy block, and wrote NEXT_PUBLIC_CELO_*.
• hardhat.config.cjs gains a celo network (chainId 42220, forno.celo.org).
• Base deploy script keeps 0.00005 ETH + original treasury 0xce8353…f1e2.

4. Pixel Links + content-security guard (new feature)

Owners can attach an optional clickable URL to a plot. No contract change — the link rides in the existing on-chain imageUri string as a fragment alongside the zone bbox:

data:image/webp;base64,…#bb=x1,y1,x2,y2&link=<encodeURIComponent(url)>

• PlotModal parses #link= and renders a clickable row; image src is stripZone'd so the fragment never breaks loading.
• validateLinkUrl() runs before the tx: requires http(s), and blocks pornography / drugs / alcohol / gambling / phishing keywords. On a violation the save is stopped and the user sees: "Invalid or restricted URL layout detected. Please provide a safe destination link."

Verification

npm run lint, npm run build, and npx hardhat compile all pass with zero errors/warnings. Celo PLOT_PRICE/TREASURY/GRID_SIZE read back correctly from the deployed contract.

Post-merge (optional)

For parity with the committed defaults, you can also set NEXT_PUBLIC_CELO_CONTRACT_ADDRESS=0x7b5E66cD88305aB33CE2c2C400167B7fFF348a23 and NEXT_PUBLIC_CELO_DEPLOY_BLOCK=69652905 in Vercel — not required, since they're now the built-in defaults.

Link to Devin session: https://app.devin.ai/sessions/dd0d6a8816204b759805887b2ff9e351
Requested by: @omiaydin1

[devin-ai-integration]

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Project	Deployment	Actions	Updated (UTC)
baseboard	Ready	Preview, Comment	Jun 15, 2026 8:03pm