Add live git status indicators

[gschier]

Add live git status indication in the sidebar, along with the ability to view the history of a request/folder/etc, and easily revert any changes.

https://yaak.app/feedback/posts/uncommitted-changes-show-and-revert-per-request

Summary

• Adds lightweight live git worktree status watching and streams status into the client.
• Shows git status colors in the sidebar, including folder rollups for descendant changes.
• Splits branch info from heavier commit/status data used by commit flows.
• Adds restore actions and a file-specific history dialog with per-commit diffs.
• Migrates atomFamily imports to jotai-family.

[chatgpt-codex-connector]

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