[Feature]: 🌐 Polkadot Integration

[iamnotstatic]

Describe the Feature

Support native Polkadot address generation, transaction signing, and balance checking within the wallet infrastructure.

Motivation / Use Case

Polkadot is a leading interoperable blockchain network with a growing ecosystem. Integrating Polkadot allows users and dApps to interact with parachains directly from the wallet, opening up use cases like staking, cross-chain swaps, and DeFi participation.

Possible Implementation

Use the Polkadot JS SDK for key management, address generation, and transaction signing. Add a new `chain-polkadot` module to abstract Polkadot-specific logic and RPC handling.

Potential Impact

• This would improve developer experience
• This would improve end-user experience
• This would support new chains or protocols
• This could affect existing functionality