Migrate fireEvent to userEvent in 7 test files

[arbrandes]

Context

PR #1641 review flagged that new/updated tests use fireEvent (low-level event dispatch) instead of userEvent (realistic user interaction simulation). userEvent is the recommended approach per Testing Library best practices. This covers 112 fireEvent calls across 7 files.

Dependency

@testing-library/user-event needs to be added as a devDependency:

npm install --save-dev @testing-library/user-event

Migration patterns

Each file will:

1. Add import userEvent from '@testing-library/user-event';
2. Remove fireEvent from the @testing-library/react import (if no longer needed)
3. Add const user = userEvent.setup(); at the top of the describe block
4. Make affected tests async (if not already)
5. Apply these conversions:

fireEvent pattern	userEvent replacement
fireEvent.click(el)	await user.click(el)
fireEvent.change(input, { target: { value: 'x' } })	await user.clear(input); await user.type(input, 'x')
fireEvent.change(select, { target: { value: 'v' } })	await user.selectOptions(select, 'v')
fireEvent.blur(el, { target: { value: 'x', name: 'n' } })	await user.type(el, 'x'); await user.tab() (clear first if needed)
fireEvent.blur(el, { target: { value: '', name: 'n' } })	await user.click(el); await user.tab()
fireEvent.blur(el) (no target)	await user.click(el); await user.tab()
fireEvent.focus(el)	await user.click(el)
fireEvent.mouseDown(el)	Keep as fireEvent.mouseDown(el) (only 2 instances; tests preventDefault)

Files (in order of complexity)

1. src/register/RegistrationFields/NameField/NameField.test.jsx (8 calls)

• 6x blur (with target value), 2x focus
• All sync → make async

2. src/forgot-password/tests/ForgotPasswordPage.test.jsx (14 calls)

• 5x change, 7x click, 1x blur, 1x focus
• 5 sync tests → make async; 4 already async

3. src/register/RegistrationFields/UsernameField/UsernameField.test.jsx (15 calls)

• 6x blur, 4x focus, 2x change, 3x click
• All sync → make async

4. src/register/RegistrationFields/EmailField/EmailField.test.jsx (16 calls)

• 12x blur, 2x click, 2x focus
• All sync → make async

5. src/progressive-profiling/tests/ProgressiveProfiling.test.jsx (14 calls)

• 8x click, 4x change (2 are selects), 2x mouseDown (keep as fireEvent)
• All sync → make async (except mouseDown test can stay sync)

6. src/reset-password/tests/ResetPasswordPage.test.jsx (19 calls)

• 10x change, 6x click, 2x focus, 1x blur
• All already async

7. src/login/tests/LoginPage.test.jsx (26 calls)

• 13x change, 11x click, 2x focus
• 16 sync → make async; 10 already async