feat: Add support for Asset Freeze transactions

[lempira]

• Implement AssetFreezeTransactionFields with asset_id, freeze_target, and frozen fields
• Add AssetFreezeTransactionBuilder with derive_builder pattern support
• Update Transaction enum to include AssetFreeze variant with proper serde serialization
• Add FFI bindings for cross-language support (Python, TypeScript, Swift)
• Update all transaction handling code to support the new transaction type
• Add comprehensive test coverage including encoding/decoding, transaction IDs, fee calculation, and transaction grouping
• Include test data generation for both freeze and unfreeze scenarios
• Add example usage in Python and TypeScript test suites

This enables freezing and unfreezing of asset holdings for specific accounts, allowing asset managers to control transfer permissions on a per-account basis.

[Copilot]

Pull Request Overview

This PR adds support for Asset Freeze transactions across the core library, FFI bindings, and language-specific SDKs.

• Introduce AssetFreezeTransactionFields and AssetFreezeTransactionBuilder in Rust core
• Extend Transaction enum, serialization, FFI, fee calculation, and ID logic to cover asset freeze/unfreeze
• Add comprehensive tests and examples in TypeScript, Python, and Rust

Reviewed Changes

Copilot reviewed 8 out of 9 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
packages/typescript/algokit_transact/tests/asset_freeze.test.ts	Add TS tests for freeze/unfreeze encoding, ID, fee
packages/python/algokit_transact/tests/test_asset_freeze.py	Add Python tests for asset freeze transactions
crates/algokit_transact_ffi/src/lib.rs	Expose AssetFreezeTransactionFields via FFI
crates/algokit_transact/src/transactions/mod.rs	Register AssetFreeze variant in the core Transaction enum
crates/algokit_transact/src/transactions/asset_freeze.rs	Define the Rust AssetFreezeTransactionFields struct
crates/algokit_transact/src/tests.rs	Add end-to-end Rust tests for freeze/unfreeze flows
crates/algokit_transact/src/test_utils/mod.rs	Extend test utilities to generate freeze/unfreeze data
crates/algokit_transact/src/lib.rs	Re-export freeze builder/fields in top-level API

Comments suppressed due to low confidence (2)

packages/python/algokit_transact/tests/test_asset_freeze.py:110

• It could be valuable to also verify that the decoded transaction’s freeze_target matches the original address (e.g., assert decoded.asset_freeze.freeze_target.address == target_account.address).

    assert get_encoded_transaction_type(encoded) == TransactionType.ASSET_FREEZE

crates/algokit_transact/src/transactions/asset_freeze.rs:25

• asset_id and freeze_target are required fields for this transaction. Consider adding builder validation (e.g., via #[builder(validator(...))]) to ensure asset_id > 0 and freeze_target is not a zero address.

pub struct AssetFreezeTransactionFields {

[Copilot]

[nitpick] The test suite is imported from "bun:test", which may conflict with the project's standard runner (e.g., Jest or Vitest). Consider aligning the import with the rest of the repository’s test framework for consistency.

[Copilot]

Cloning the entire Transaction just to extract asset_freeze can be expensive. Instead, pattern-match on tx.asset_freeze or take() the field to avoid a full struct clone.

Suggested change

	let data = tx.clone().asset_freeze.unwrap();
	let data = tx.asset_freeze.unwrap();