Add Rescue Function for Uncommitted ERC20 Tokens

[pali101]

Description

Currently, if ERC20 tokens are sent directly to the contract, they become locked permanently. Implement a rescue function that allows the owner to recover only those tokens that aren’t committed to an active channel.

Enhancements

Rescue function

• Add a rescueTokens function restricted to the contract owner.
• Ensure it only withdraws tokens in excess of those committed to open channels.

Tracking commited tokens

• Maintain a mapping to track the total ERC20 tokens tied up in channels.
• Update this tracking during channel creation, redemption, and reclamation.

Security

• Prevent misuse by allowing only partial withdrawals for uncommitted tokens.
• Keep reentrancy protections and proper validations in place.

Benefits

• Prevents accidental loss of ERC20 tokens.
• Ensures funds tied to active channels remain secure.
• Increases contract robustness and user trust.