Wallet Integration: Make it instantly usable

[PaulSnow]

Goal

When a user connects their wallet to the explorer, they should be able to:

1. See their balances immediately
2. Send tokens with a few clicks
3. Receive tokens by copying their address
4. Create accounts (ADI, token accounts)
5. Sign transactions for multi-sig

Current State

• Floating wallet button works ✓
• Connect to daemon works ✓
• Unlock vault works ✓
• List keys works ✓
• Everything else is broken or placeholder

Issues to Fix (Priority Order)

P0 - Must have for basic usability

• Show lite addresses instead of key hashes #83 - Show lite addresses instead of key hashes
• Show account balances in wallet panel #84 - Show account balances
• Faucet button for test networks #88 - Faucet button for test networks
• Wire up Send Tokens action #85 - Wire up Send Tokens

P1 - Core functionality

• Wire up Add Credits action #86 - Wire up Add Credits
• Show 'Your Accounts' section with owned accounts #87 - Show Your Accounts section
• Create ADI from lite account #90 - Create ADI

P2 - Advanced features

• Sign pending multi-sig transactions #89 - Sign pending multi-sig transactions

Architecture

┌─────────────────────────────────────────────────────┐
│  Explorer (React)                                    │
│  ┌─────────────────────────────────────────────────┐│
│  │ WalletPanel.tsx                                 ││
│  │ - Your Accounts (balances, addresses)          ││
│  │ - Quick Actions (send, credits, faucet)        ││
│  │ - Pending Transactions                          ││
│  └─────────────────────────────────────────────────┘│
│                         │                            │
│                         │ JSON-RPC                   │
│                         ▼                            │
└─────────────────────────────────────────────────────┘
                          │
                          ▼
┌─────────────────────────────────────────────────────┐
│  Wallet WebUI (Go)                                   │
│  /v1 API                                             │
│  - wallet.* methods (keys, sign, execute)           │
│  - explorer.* methods (get, history)                │
└─────────────────────────────────────────────────────┘
                          │
                          ▼
┌─────────────────────────────────────────────────────┐
│  Wallet Daemon                                       │
│  - Key storage                                       │
│  - Transaction signing                               │
└─────────────────────────────────────────────────────┘

Definition of Done

A new user can:

1. Open explorer
2. Click wallet button
3. See their lite address and balance
4. Copy address to receive funds
5. Send tokens to someone
6. Get test tokens (on devnet)