release: fold #643 + lane worktree cleanup into v1.2.9 changelog

[arul28]

Two desktop changes landed on main after the initial v1.2.9 changelog and should ship in v1.2.9:

• Ade Web Renderer Refinements #643 — Settings General-tab reorganization + web-renderer UX.
• Stale lane worktree cleanup — recorded and safely retried after delete.

This folds both into changelog/v1.2.9.mdx and CHANGELOG.md. After this lands and ci-pass is green, the v1.2.9 tag is re-pointed to this commit (no release object exists yet) and the release runs.

🤖 Generated with Claude Code

Greptile Summary

This PR updates the v1.2.9 release notes with two additional desktop changes. The main changes are:

• Adds the Settings General-tab reorganization and web-renderer UX updates.
• Notes that the separate Integrations tab was retired into General.
• Adds stale lane worktree cleanup recording and safe retry behavior.
• Mirrors the release-note updates in both CHANGELOG.md and changelog/v1.2.9.mdx.

Confidence Score: 5/5

Safe to merge; the changes are limited to release-note text.

The diff only updates changelog documentation and does not alter runtime behavior, build logic, or persisted data.

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