extract unauthorized-from FlowTransferV1 helpers

[thedavidmeister]

Summary

Three negative-path tests in Flow.transfer.t.sol built two-element FlowTransferV1 structs inline with the same shape (one transfer unauthorized + one self-flow) repeated per token type.

Adds three helpers in FlowTransferOperation.sol:

• unauthorizedERC20Flow
• unauthorizedERC721Flow
• unauthorizedERC1155Flow

Each takes the unauthorized address, the authorized actor, the flow, and per-type ids/amounts, and returns the full FlowTransferV1.

The matching inline blocks in the three negative-path tests are replaced. The second block in the ERC20 test (unauthorized at slot 1, not 0) keeps its inline construction since it exercises a different shape.

Closes #421.

Test plan

• all 3 negative-path tests still pass — 100 fuzz runs each

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: ff48a312-36d4-4787-9358-f6b23d998bd1

📥 Commits

Reviewing files that changed from the base of the PR and between ceaea3c and 9e0082c.

📒 Files selected for processing (2)

• test/abstract/FlowTransferOperation.sol
• test/src/concrete/Flow.transfer.t.sol

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch 2026-05-07-issue-421-unauthorized-transfer-helpers

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