feat(contractor): integrate payment-method and bank-account hooks into PaymentMethod

[serikjensen]

Summary

• Refactors the PaymentMethod component to compose useContractorPaymentMethodForm and useContractorBankAccountForm via composeSubmitHandler, replacing the old PaymentTypeForm / BankAccountForm internals.
• Direct Deposit submits through the bank-account form (which creates/replaces the bank account and flips the contractor to Direct Deposit server-side); Check submits through the payment-method form. The masked account number is prefilled and sent as the keep-existing sentinel so an unchanged Direct Deposit preserves the account.
• Adds a dedicated SCSS module to give the section full width.

Notes

• Supersedes feat(contractor): migrate PaymentMethod to useContractorPaymentMethodForm hook #2293, which will be closed.
• This PR is stacked on top of feat(contractor): add useContractorBankAccountForm hook #2301 (useContractorBankAccountForm) and feat(contractor): add useContractorPaymentMethodForm hook #2302 (useContractorPaymentMethodForm). Because it targets main, it currently shows those hooks' code as well; once feat(contractor): add useContractorBankAccountForm hook #2301 and feat(contractor): add useContractorPaymentMethodForm hook #2302 merge, rebase this branch on main and the diff will narrow to the integration changes.

Test plan

• PaymentMethod component + both hook test suites pass (26/26)
• npm run derive regenerates API report + docs

Made with Cursor

[serikjensen]

@cursoragent you should be able to bring this one up to date with main. The PRs that is based on for the useContractorBankAccount and payment method hooks have been merged so you should be able to base the integration off of that

[cursor]

The format check failed on commit 3c26a1e9 (the rebased commit), but I've already fixed this issue. The failure was due to a Prettier formatting problem in useContractorPaymentMethodForm.tsx where a union type wasn't formatted correctly.

What I did to fix it:

1. Ran npm run format:check locally and identified the formatting issue
2. Ran npm run format to fix it
3. Committed the fix as 1b26295f chore: fix prettier formatting
4. Pushed the fix to the branch

The latest commit on the branch is now 1b26295f, which includes the formatting fix. The CI should pass on the new commit once it runs. The formatting issue was a minor side effect of the rebase where the hook file from main had slightly different formatting that got adjusted during conflict resolution.