test: add fast, isolated unit coverage for freezeOrderComponents

[batuhankocyigit]

test: add fast, isolated unit coverage for freezeOrderComponents

Motivation

freezeOrderComponents (added recently to guarantee the orderComponents
exposed on a create action can't drift from what actually gets signed — see
its JSDoc in src/utils/order.ts) currently only has indirect coverage
through test/execute-approvals.spec.ts, which needs the full Hardhat
network (contract deployment, a signer, etc.) to run.

That's appropriate for testing the end-to-end feature, but the freezing
logic itself is a pure function with no on-chain dependency, and it's a
mutation-safety guarantee the JSDoc goes out of its way to explain the
reasoning for — exactly the kind of thing worth pinning down with a fast,
isolated unit test that runs in milliseconds and fails with a precise
message if the freezing behavior ever regresses.

What this adds

A freezeOrderComponents describe block in test/utils/order.spec.ts
(alongside the existing deductFees suite, since both live in
src/utils/order.ts), covering:

• Returns the same object reference rather than a clone (the JSDoc is
  explicit that this is intentional, not an oversight).
• Freezes the top-level OrderComponents object.
• Deep-freezes offer items individually, not just the array wrapper.
• Deep-freezes consideration items individually, and that the array
  itself rejects mutation (e.g. push).
• Doesn't throw when a nested item was already frozen before the call
  (the Object.isFrozen short-circuit in deepFreeze).

Testing

• npx tsc --noEmit — clean.
• npx biome check test/utils/order.spec.ts — clean.
• Ran the new suite directly: 9/9 passing (4 pre-existing deductFees
  cases + 5 new freezeOrderComponents cases), all in single-digit
  milliseconds since none of it touches the network.

Scope

Test-only change, one file. No production code touched.

[ryanio]

thanks!

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.85%. Comparing base (f618d19) to head (74c73ad).
⚠️ Report is 358 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #957      +/-   ##
==========================================
+ Coverage   98.27%   98.85%   +0.57%     
==========================================
  Files          35       45      +10     
  Lines       14526    17579    +3053     
  Branches      660      897     +237     
==========================================
+ Hits        14276    17378    +3102     
+ Misses        245      194      -51     
- Partials        5        7       +2     

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