Feat/test authentication journey

[AAdewunmi]

Summary

Adds focused authentication journey coverage for signup, login, logout, profile access, and user factory behavior.

Changes

• Expanded auth view integration tests.
• Covered signup page rendering and successful account creation.
• Added duplicate email and duplicate username validation tests.
• Added username generation collision coverage.
• Added save(commit=False) signup form coverage.
• Covered authenticated login/signup redirects to the dashboard.
• Covered logout redirect behavior.
• Updated user factories for password handling and role assignment.

Behavior

• Signup creates valid custom users and redirects to the dashboard.
• Login with email redirects users to the dashboard.
• Authenticated users are redirected away from login/signup.
• Logout returns users to the public home page.
• Anonymous profile access redirects to login with next.
• Authenticated users can view profile details.
• User role factories attach roles through studybuddy_roles.

Why

The authentication journey is the first real user path through the product, so it needs reliable coverage before the dashboard becomes the main authenticated surface.

Validation

• docker compose exec -T web python -m black . --check
• docker compose exec -T web python -m ruff check .
• docker compose exec -T web pytest -q
• Focused auth/user tests passed.

Result

All checks pass. Full suite result: 38 passed.

Notes

This branch is ahead of main and ready to open as a PR from feat/test-authentication-journey.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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