feat(login): add password visibility and clean up block titles

[krishpranav]

Description

Login blocks looked polished, but they were still missing a few practical details users expect in real auth forms.
This patch closes that gap and keeps block naming aligned with what each block actually renders.

What changed

• Added password visibility toggle support to login01, login02, login03, and login04
• Added autocomplete="username" on login email inputs
• Added autocomplete="current-password" and minlength=8 on password inputs
• Extended shared Input API to support autocomplete and minlength
• Renamed login and sidenav block titles to be accurate and consistent in the registry
• Added tests to lock title mappings and password input expectations

Validation

cargo test -p app --lib block_entry -- --nocapture

running 3 tests
test domain::blocks::block_entry::tests::login_block_titles_are_accurate_and_consistent ... ok
test domain::blocks::block_entry::tests::sidenav_block_titles_are_accurate_and_consistent ... ok
test domain::blocks::block_entry::tests::login_blocks_include_password_field_security_and_usability_features ... ok

test result: ok. 3 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s

Screenshot

Closes #10

[max-wells]

Great contribution — clean implementation, tests included, and good attention to UX details (autocomplete, minlength, password toggle). Happy to merge this in. Thanks @krishpranav!