Editor updates

[ethanpalm]

Documentation changes

Updates for recent editor changes

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For Reviewers

When reviewing documentation PRs, please consider:

✅ Technical accuracy

• Code examples work as written
• Commands and configurations are correct
• Links resolve to the right destinations
• Prerequisites and requirements are accurate

✅ Clarity and completeness

• Instructions are clear and easy to follow
• Steps are in logical order
• Nothing important is missing
• Examples help illustrate the concepts

✅ User experience

• A new user could follow these docs successfully
• Common gotchas or edge cases are addressed
• Error messages or troubleshooting guidance is helpful

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Note

Low Risk
Documentation-only changes with no runtime or security impact; verify links to git-essentials resolve if that page isn’t in this diff.

Overview
This PR restructures the web editor docs around dedicated pages and updates them for newer product behavior.

Navigation (docs.json) adds Collaborate, Share a preview, and Git essentials under the Editor group so preview/sharing and Git basics aren’t only buried in branching/publishing.

Content consolidation: Long sections on preview URLs, editor links, and duplicate collaboration material are removed from branching-and-publishing and collaborate and point to share-a-preview (including preview screenshots there). Conflict resolution in branching/publishing now directs users to GitHub/GitLab merge/rebase instead of in-editor conflict picking; the real-time collaboration section is dropped from that page.

New/expanded product coverage: collaborate documents the in-editor agent panel (context attachments, session diffs, feedback), agent edits via the panel (not only API/MCP), and Add to Assistant from a text selection. pages explains Navigation vs Files, file/folder actions, and unlisted pages. settings describes opening preferences via the toolbar settings icon instead of the avatar menu. live-preview tightens the comparison table and notes authenticated sites should use preview deployments.

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