standardise loop increment to ++i across LibFlow siblings

[thedavidmeister]

Summary

flowERC721 used ++i; flowERC20 and flowERC1155 used i++. All three loops are inside unchecked blocks so the codegen is identical, but the sibling functions should look identical. Standardised on ++i.

Closes #416.

Test plan

• forge build clean

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 0842095f-6364-4033-b2a4-85888b1a6bef

📥 Commits

Reviewing files that changed from the base of the PR and between ec7a7f7 and db4cf6d.

📒 Files selected for processing (1)

• src/lib/LibFlow.sol

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch 2026-05-07-issue-416-libflow-loop-increment-style

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[thedavidmeister]

Reviewed db4cf6d: standardise loop increment to ++i across LibFlow siblings — rebased onto main (test-only union conflict resolution + forge fmt), all checks green. LGTM.