feat: PublishingShell edit the open site base URL (#4978)

[natechadwick-intsof]

Summary

PublishingShell site workspace can edit and save the open site's base URL (slice 51 of #4531).

• The workspace loads the current base URL with GET /services/sites/{nameOrId}.
• Save sends PUT /services/sites/{nameOrId} with the site name and trimmed base URL only.
• The URL must be absolute http or https. Empty, invalid, unchanged, and Cancel do not PUT and do not show a saved notice.
• HTTP 400, 403, and 409 stay on the form without a success notice.
• After a successful save, reopening the site shows the saved URL.

Operator: Grok: night-issue-prs (model grok-4.6)

Parent: #4531
Fixes #4978

Test plan

• Vitest: siteBaseUrl.test.ts (3) and SiteBaseUrlPanel.test.tsx (5)
• WebUI mvn clean install (Java tests included)
• Playwright surface on H2 QA: tests/publishing/siteBaseUrl.spec.js — 1 passed
• Human: open Publish, edit a site base URL, confirm it survives a reload; confirm a blank URL is rejected

Product documentation

• Updated product-docs/8.2/admin/publishing.md (Edit the open site base URL)

Maven evidence

• modules_built: WebUI
• Command: cd WebUI && rtk mvn clean install — BUILD SUCCESS. Tests run: 69, Failures: 0, Errors: 0, Skipped: 0. Vitest: 8 passed (2 files). No new compiler warnings from this change (existing javadoc warnings on untouched Java).
• downstream_checked: none (no public Java signature change)

UI proof (C5)

• python3 docker/scripts/perc-devctl.py qa-up — TEST_CMS_URL=http://127.0.0.1:9993
• qa-health RESULT:OK HTTP:200 HEALTH:healthy
• python3 docker/scripts/perc-devctl.py qa-deploy-webui then qa-health again RESULT:OK
• cd modules/perc-qa-automation/frontend && npm run test:surface -- --path tests/publishing/siteBaseUrl.spec.js — 1 passed
• console-clean=yes (spec asserts no pageerror / unexpected console error)
• server.log-clean=yes (no feature ERROR lines observed; cell removed with qa-down)
• qa-down RESULT:OK

Pre-push local code review

Summary

Machine analysis found 0 finding(s), 0 bug(s).

Scope

• Base: origin/main
• Head: HEAD
• Files: 9 analyzed
• Persona: erlang 0.1.1
• Persona source: /home/nate/.local/share/mkd/agents/erlang

Recommendation

approve

Gate

• Blocking bugs: 0
• May commit/push: yes

Issues

No issues.

Co-Authored by Grok Build 1.0.41 using grok-4.6 with agent night-issue-prs.

[natechadwick-intsof]

LGTM. In-diff bugs: 0. Site base URL save is client-validated (absolute http(s)), cancel and unchanged values do not PUT, and 400/403/409 stay on the form. PUT sends name plus baseUrl only; SitesAdaptor.applyWritableFields leaves null description/protocol fields unchanged.

Persona: erlang 0.1.1. mkd-code-review 0.1.18 pack percussion gate advisory. Report: docs/ai-generated/code-reviews/pr-4998-erlang.md.

Same-login APPROVE is rejected; commenting LGTM and squash-merging.

Co-Authored by Grok Build 1.0.41 using grok-4.6 with agent night-issue-prs-erlang.