DRAFT: feat(transactions): detect burn address in ICRC token send flow

[yhabib]

Motivation

When a user sends ICRC/SNS tokens to the minting account (which is the burn address in ICRC-1), the transaction incurs no fee. It should be clear to the user that they are burning tokens, not just sending them to a regular address.

Changes

• Added the queryIcrcMintingAccount API function to fetch the minting account from an ICRC-1 ledger canister.
• Retrieved the minting account on mount in IcrcTokenTransactionModal and passed it down as burnAddress.
• Added the burnAddress prop to TransactionModal and TransactionForm to propagate the burn address through the send flow.
• Displayed a "Burn address" label below the destination input when the entered address matches the minting account.
• Hidden the transaction fee and used 0n as the effective fee when the destination is the burn address, both for the maximum amount calculation and the actual transfer.

Tests

Todos

• Accessibility (a11y) – any impact?
• Changelog – is it needed?