ThePalaceProject / web-patron / 25675471151

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Prefer heuristic library short name for slug (PP-4263) (#133)

## Description

Adds heuristic derivation of each library's slug from its registry
catalog entrie. Extracts the first path component of the catalog root
link (e.g. `CA0156` from `https://ca.thepalaceproject.org/CA0156/`),
falling back to the same part of the authentication document link, and
returning `null` if neither yields a value. `computeSlug` calls it and
falls back to the registry identifier as before.

## Motivation and Context

We want to use the library short name as the slug, but we don't maintain
that value in the registry (let alone include it in the feed). So, for
the time being, we heuristically pull it from the first path component
of the library catalog or authentication document URL, since that is a
safe place to find it for the Palace Manager library catalog servers in
The Palace Project hosted environment.

[Jira PP-4263]

## How Has This Been Tested?

- New/updated tests to cover the new and changed functionality.
- Manual testing in local dev environment.
- All checks pass locally.
- [CI
checks](https://github.com/ThePalaceProject/web-patron/actions/runs/25460022748)
pass.

## Checklist:

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

208 of 238 branches covered (87.39%)

Branch coverage included in aggregate %.

14 of 20 new or added lines in 1 file covered. (70.0%)

325 of 368 relevant lines covered (88.32%)

31.44 hits per line