refactor [CAT-15]: update request button style

[jaredgalanis]

CAT-15: Style item-level request buttons in NDE

The "Request from JH" button under Locations was rendering as plain text — not very clickable-looking. This brings it visually in line with the styled request buttons in
current Catalyst (JHU blue, bold white text, rounded).

Changes

• Added a rule block in src/assets/css/custom.css targeting nde-location-item-service-button button
• Solid #0072ce background, white bold text, border-radius: 1em, hover darkens to #002d72
• Slightly tighter padding than Catalyst (0.5em 1.25em) and white-space: nowrap so the label fits the narrower NDE column without wrapping to two lines

Reference for colors / shape: 01JHU_INST-JHU/css/buttons.css in the legacy primo-customization-package repo.

Notes

• Used !important on a few properties to override Material's default mat-button styles. Open to a cleaner approach if anyone has one.
• Selector is the custom element wrapper (nde-location-item-service-button), so it shouldn't bleed onto other Material buttons elsewhere on the page.

Testing

• Ran npm run start:proxy against the JHU sandbox env
• Signed in and loaded the example item from the ticket — button renders styled, single-line, hover state works
• Spot-checked other pages (search results, account) — no other buttons affected

Closes CAT-15.