Simplify the visual editor owner workflow

[OpaceDigitalAgency]

What changed

• replaces the permanent Review tab with one compact Changes tray
• makes Text, Sections and SEO one consistent editing mode set
• moves bulk text and section management behind progressive disclosure
• separates demo navigation and technical source details from the owner workflow
• preserves every existing edit, review, recovery and safety capability

Source-safety impact

• Owning file/path resolution: unchanged
• Ambiguity, stale-source and conflict behaviour: unchanged and still fail closed
• Production-isolation impact: none
• Recovery or rollback impact: labels and placement simplified; receipt and restore behaviour unchanged

Validation

• Added or updated focused unit tests
• Added or updated Playwright coverage for user-visible behaviour
• Updated documentation and CHANGELOG.md
• Ran npm run test:all
• Reviewed the packed package contents
• Reviewed the resulting Git diff

Final evidence: 37 unit tests, 9 Chromium workflows, formatting, linting, TypeScript, Astro check/build, production-isolation, package dry-run and release candidate check pass. npm audit reports zero vulnerabilities.

Local owner testing must use the exact green PR commit before merge or publication.