refactor(test): extract _buildFlowStack helper to DRY duplicate stack builders

[thedavidmeister]

Closes #258

burnFlowStack, mintFlowStack, and mintAndBurnFlowStack in test/abstract/FlowTest.sol had identical bodies. Extract a private _buildFlowStack helper and delegate all three to it.

Summary by CodeRabbit

• Refactor
  • Simplified flow stack generation by consolidating repeated logic into a shared helper.
  • Improved consistency across burn, mint, and combined flow stack outputs.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 5b83dce7-0280-4662-89fb-40372780f693

📥 Commits

Reviewing files that changed from the base of the PR and between 704f615 and 00e7161.

📒 Files selected for processing (1)

• test/abstract/FlowTest.sol

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Walkthrough

FlowTest now centralizes flow-stack construction in a private helper that returns both stack and transferHash. burnFlowStack, mintFlowStack, and mintAndBurnFlowStack delegate to that helper.

Changes

Flow stack construction refactor

Layer / File(s)	Summary
Shared stack builder helper test/abstract/FlowTest.sol	A new private _buildFlowStack(FlowTransferV1) helper computes the transfer hash and flow stack, and all three flow-stack builders return its result.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the refactor to extract a shared FlowStack helper.
Linked Issues check	✅ Passed	The refactor matches #258 by DRYing the three stack builders into a private helper.
Out of Scope Changes check	✅ Passed	The changes stay within the requested FlowTest refactor and do not add unrelated behavior.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch 2026-06-27-issue-258-dry-stack-builders

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