Add Undo/Redo support in the viewer

[emilk]

What

• Closes https://github.com/rerun-io/rerun/issues/3135
• Proceeded by https://github.com/rerun-io/rerun/pull/7602
• Proceeded by https://github.com/rerun-io/rerun/pull/7603
• Proceeded by https://github.com/rerun-io/rerun/pull/8241
• New issue: https://github.com/rerun-io/rerun/issues/8249

This PR implements Undo and Redo for any edit to the active blueprint.

https://github.com/user-attachments/assets/05018729-f01e-42f4-a84f-b48dbf31b060

Implementation

This implements undo/redo by editing the "time cursor" for the blueprint timeline. Undo moves it backwards, redo forwards. When doing an action, all redo history is erased from the store with a new ChunkStore::drop_time_range function.

Known shortcomings

• Undo doesn't work when the blueprint streams panel is open

Checklist

• [x] I have read and agree to Contributor Guide and the Code of Conduct
• [x] I've included a screenshot or gif (if applicable)
• [x] I have tested the web demo (if applicable):
  • Using examples from latest main build: rerun.io/viewer
  • Using full set of examples from nightly build: rerun.io/viewer
• [x] The PR title and labels are set such as to maximize their usefulness for the next release's CHANGELOG
• [x] If applicable, add a new check to the release checklist!
• [x] If have noted any breaking changes to the log API in CHANGELOG.md and the migration guide

• PR Build Summary
• Recent benchmark results
• Wasm size tracking

To run all checks from main, comment on the PR with @rerun-bot full-check.

[emilk]

This is blocked by:

• https://github.com/rerun-io/rerun/issues/8056

[github-actions[bot]]

Web viewer built successfully. If applicable, you should also test it:

• [ ] I have tested the web viewer

Result	Commit	Link
✅	2e6be76	https://rerun.io/viewer/pr/7546

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