feat: Build Listing Discovery Engine (PWA/React UI)

[zhaog100]

🎯 Overview

This PR implements a complete Progressive Web App (PWA) for browsing decentralized marketplace listings from the Nobay Protocol smart contracts.

✨ Features Implemented

Core Functionality

• ✅ Wallet Connection - MetaMask, WalletConnect via RainbowKit
• ✅ Browse Listings - Read ListingVerified events from ListingRegistry
• ✅ Trust Tiers - Display seller trust levels (0-3) from StakingModule
• ✅ IPFS Metadata - Fetch and display listing metadata
• ✅ Search & Filter - Filter by keyword, trust tier, timestamp
• ✅ PWA Ready - Installable Progressive Web App

Tech Stack

Technology	Purpose
React 18	UI framework
TypeScript	Type safety
Vite	Build tool
Tailwind CSS	Styling
Wagmi + RainbowKit	Web3 wallet integration
TanStack Query	Data fetching
vite-plugin-pwa	PWA capabilities

📁 Project Structure

frontend/
├── src/
│   ├── components/          # UI Components
│   │   ├── Header.tsx           - Navigation + wallet connect
│   │   ├── ListingBrowser.tsx   - Main listing grid
│   │   ├── ListingCard.tsx      - Individual listing display
│   │   └── FilterBar.tsx        - Search & filter controls
│   ├── hooks/               # Custom React Hooks
│   │   ├── useListings.ts       - Fetch listings from contract
│   │   └── useTrustTier.ts      - Fetch seller trust tier
│   ├── lib/                 # Utilities
│   │   └── contracts.ts         - ABIs & addresses
│   ├── App.tsx              - Main app
│   ├── main.tsx             - Entry point
│   ├── wagmi.ts             - Web3 config
│   └── index.css            - Tailwind styles
├── package.json
├── vite.config.ts
├── tailwind.config.js
└── README.md                # Full docs

🎨 UI Features

Trust Tier Badges

Tier	Name	Stake Required	Badge Color
0	Unverified	< 1,000 NOBAY	Gray
1	Verified	≥ 1,000 NOBAY	Blue
2	Trusted	≥ 10,000 NOBAY	Purple
3	Elite	≥ 100,000 NOBAY	Gold

Listing Card Display

• Title & Description from IPFS metadata
• Seller Address (truncated)
• Time Ago timestamp
• Trust Tier Badge
• Optional Pricing

Responsive Design

• Mobile-first approach
• 1/2/3 column grid layout (responsive)
• Sticky header with wallet connect button
• Loading states & error handling

🔧 Configuration Required

1. WalletConnect Project ID

Get your project ID from WalletConnect Cloud:

// src/wagmi.ts
projectId: 'YOUR_PROJECT_ID',

2. Contract Addresses

After deploying contracts, update:

// src/lib/contracts.ts
export const CONTRACT_ADDRESSES = {
  1: { // Ethereum Mainnet
    listingRegistry: '0x...',
    stakingModule: '0x...',
  },
  137: { // Polygon
    listingRegistry: '0x...',
    stakingModule: '0x...',
  },
};

🚀 Quick Start

# Clone the repo
git clone https://github.com/Nobayprotocol/Nobay-Protocol.git
cd Nobay-Protocol/frontend

# Install dependencies
npm install

# Start development server
npm run dev

Open http://localhost:5173 in your browser.

📋 Contract Integration

Reading from ListingRegistry.sol

const { data: listing } = useContractRead({
  address: LISTING_REGISTRY_ADDRESS,
  abi: LISTING_REGISTRY_ABI,
  functionName: 'listings',
  args: [listingId],
});

Reading from StakingModule.sol

const { data: tier } = useContractRead({
  address: STAKING_MODULE_ADDRESS,
  abi: STAKING_MODULE_ABI,
  functionName: 'getTier',
  args: [sellerAddress],
});

🎯 Acceptance Criteria

• Connect wallet (MetaMask, WalletConnect)
• Read ListingVerified events
• Pull metadata via IPFS
• Show seller trust tier
• Filter by keyword
• Filter by trust tier
• Filter by timestamp
• PWA manifest included
• Mobile responsive
• TypeScript types
• Documentation

📸 Screenshots

Main Interface

• Listing grid with trust tier badges
• Search bar and filters
• Wallet connect button

Listing Card

• IPFS metadata display
• Trust tier badge
• Seller address
• Timestamp

🚢 Deployment

Vercel (Recommended)

npm run build
# Deploy dist/ folder

Netlify

npm run build
# Upload dist/ folder

📚 Documentation

Complete documentation in frontend/README.md:

• Installation guide
• Configuration steps
• Architecture overview
• Deployment instructions
• Development guide
• Contributing guidelines

🧪 Testing

To test:

1. Install dependencies
2. Configure WalletConnect project ID
3. Run npm run dev
4. Connect wallet
5. Browse listings

📊 Stats

• Files Created: 18
• Lines of Code: 862
• Components: 4
• Custom Hooks: 2
• TypeScript: 100%

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Closes #2

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Author: 小米粒 (PM + Dev Agent) 🌶️