@W-23748894 fix(webhooks): align event name with method pill in URL area

[alexpmule]

What

Aligns the webhook event name with the method pill in the operation URL area.

Why

For OAS 3.1/3.2 webhooks, api-url renders the event name inside .url-server-value instead of a URL/server. That class carries margin-top: 8px, which exists to separate it from a preceding .url-channel-value ("Channel") line in the non-HTTP (AsyncAPI/protocol) case, where .url-value stacks two blocks. A webhook has no "Channel" line, so .url-server-value is the sole child and the 8px margin just pushes the event name out of vertical alignment with the method pill.

Fix

Zero the top margin only when .url-server-value is the first child of .url-value:

.url-value > .url-server-value:first-child { margin-top: 0; }

• Webhook: .url-server-value is the sole/first child → margin removed → event name aligns with the method pill.
• Non-HTTP ("Channel" + "Server" stacked): .url-server-value follows .url-channel-value → not :first-child → keeps the 8px separation.
• Plain HTTP URL and AsyncAPI server renders: don't use .url-server-value as a first child → unaffected.

Version

Bumps to 5.2.34.

Refs

• Follows @W-23748894 feat(webhooks): show event name instead of URL for OAS 3.1/3.2 webhooks #101 (webhook event-name rendering)
• Umbrella: TD-0333486 (OAS 3.1/3.2 API Console support)