test(forms): add structural snapshot tests

[pchieneye]

test(forms): add structural snapshot tests

Summary

This PR adds deterministic structural/snapshot coverage for the contract and milestone form render output.

What changed

• Added empty-state, populated-state, and validation-error structure assertions for the contract creation form.
• Added empty-state and loaded-state structure assertions for the milestone creation form.
• Captured stable snapshots to guard against regressions in rendered form structure and key UI states.

Why

The forms’ rendered structure was not being protected by deterministic tests, which made regressions easier to miss. These tests increase confidence in the form markup and accessibility-related structure without relying on timestamps or random values.

Verification

The following checks were run successfully:

• npm run lint
• npm test -- --runInBand
• npm run build

Closes: #710

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