feat: add near-term workflow improvements

[hewigovens]

No description provided.

[gemini-code-assist]

Code Review

This pull request introduces significant workflow enhancements, including rebase placement support (onto, after, before), a saved revsets library, and raw jj command execution with history. The evolution log now supports hiding or collapsing snapshots and includes a restore action. Additionally, the diff engine has been updated to use the histogram algorithm and now supports line wrapping in both GPUI and SwiftUI shells. Feedback indicates a critical issue where the jj revert command is called with an unsupported --onto flag, and it is suggested to move hardcoded UI strings in the evolution log logic to a localization system.

[chatgpt-codex-connector]

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