Add 7 new e2e tests verifying profile form validation in both manage
and admin UIs: invalid phone number, phone normalization, E.164 hint
attributes, and admin-side email/phone/picture URL validation errors.
Fix 3 pre-existing test failures:
- Replace invalid seeded phone number (+1234567890) with valid E.164
(+12025551234) that was causing profile update tests to fail
- Update email validation error assertion to match actual pydantic
message (value_error type uses raw message, not label-prefixed)
Add /manage/profile page where authenticated users can view and edit
their OIDC profile fields (given_name, family_name, preferred_username,
email, phone_number, picture, locale).
- Create manage/base.html with tab-style nav for Profile/Credentials
- Update credentials.html to extend manage/base.html
- Add GET/POST routes with server-side validation
- Add input styling for tel and url input types
- Add profile test user with pre-filled data in setup_db.py
- Add 19 E2E tests covering structure, navigation, updates, validation
- All 76 E2E tests and 172 Python tests pass
