test: add component tests for create-form validation and unlock-chart SVG render

[simeontech]

Summary

Adds component tests for two open issues, both isolated from e2e coverage.

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#653 — Component tests for create-form.tsx client-side validation

File: __tests__/components/create-form.test.tsx

Tests the validate() logic inside CreateForm in full isolation using React Testing Library. All heavy dependencies (hooks, contract lib, Next.js navigation, child components) are mocked.

Test	What it covers
Required fields empty	Shows invalidAddressFormat + invalidAmount errors on submit
Invalid recipient address	Shows invalidAddressFormat error; no amount error
Cliff amount exceeds total	Shows cliffExceedsTotal error when cliffAmount > amount

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#654 — Component tests for full SVG render of unlock-chart.tsx

File: __tests__/components/unlock-chart-render.test.tsx

Renders the full UnlockChart component with both fixture types and asserts the expected SVG structure. Complements the already-merged toX()/toY() unit tests.

Test	What it covers
No-cliff stream — SVG present	role="img" element renders
No-cliff stream — unlock path	<path stroke-width="2"> present
No-cliff stream — no cliff line	No <line stroke-dasharray="4 3">
No-cliff stream — no Cliff legend	queryByText('Cliff') returns null
Cliff stream — SVG present	role="img" element renders
Cliff stream — unlock path	<path stroke-width="2"> present
Cliff stream — cliff line	<line stroke-dasharray="4 3"> present
Cliff stream — Cliff legend	getAllByText('Cliff') returns results

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Test results

Test Files  2 passed (2)
Tests       11 passed (11)

Closes #653
Closes #654

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