ThePalaceProject / web-patron / 27304269733

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Show forgot password link (PP-4418) (#144)

## Description

<!--- Describe your changes -->
Add a "Forgot your password?" link to the CPW sign-in screen, matching
the existing behavior in the Palace iOS and Android apps.

<img width="362" height="294" alt="image"
src="https://github.com/user-attachments/assets/cd994d9d-5336-4b51-a49f-09e4d3a8b41f"
/>


## Motivation and Context

<!--- Why is this change required? What problem does it solve? -->
<!--- If it fixes an open issue, please link to the issue here. -->
The Palace mobile apps (iOS and Android) already expose a "Forgot your
password?" button on the sign-in screen when the selected library has a
reset password link provided in its authentication document. Tapping the
button opens a web browser to a password reset screen, where the patron
can request a reset link and complete the flow.

CPW does not currently offer any equivalent affordance. Patrons who
forget their password while signing in through the web have no
in-product path to recover the account — they have to contact library
staff or know to navigate to the reset URL directly.

[Jira PP-4418](https://ebce-lyrasis.atlassian.net/browse/PP-4418) adds
the same "Forgot your password?" entry point to CPW's sign-in screen.
Clicking the link opens a password reset page in a new browser tab.

## How Has This Been Tested?

<!--- Please describe in detail how you tested your changes. -->
<!--- Include details of your testing environment, and the tests you ran
to -->
<!--- see how your change affects other areas of the code, etc. -->
- Manually tested in latest versions of Firefox, Chrome, and Safari
- Added unit tests

## Checklist:

<!--- Go over all the following points, and put an `x` in all the boxes
that apply. -->
<!--- If you're unsure about any of these, don't hesitate to ask. We're
here to help! -->

- [ ] I have updated the documentation accordingly.
- [x] All new and existing tests passed.

223 of 258 branches covered (86.43%)

Branch coverage included in aggregate %.

1 of 1 new or added line in 1 file covered. (100.0%)

357 of 401 relevant lines covered (89.03%)

31.59 hits per line