[Feature]: manual git snapshots/turns

[nathanscain]

Before submitting

• I searched existing issues and did not find a duplicate.
• I am describing a concrete problem or use case, not just a vague idea.

Area

apps/desktop

Problem or use case

I want to create manual snapshots/turns for cases when I make manual changes between agent commands.

Proposed solution

Add another small button to the top of the diff view that adds a manual "turn" - possibly indicated in some way as being manual (ex: Manual # instead of Turn #)

Why this matters

Turns / Snapshots make sure returning to a previous state is possible if the agent performs a destructive action. This works for agent changes, but there is no fallback when working interactively with the model with some manual actions.

Smallest useful scope

Button on diff view that adds a turn manually based on current worktree state.

Alternatives considered

handling with git directly outside of t3-code - not ideal for many obvious reasons (cleanup, breaking flow, etc)

Risks or tradeoffs

what to do when the button is clicked and there are no changes - likely solved by following the current practice of allowing empty "turns'

Examples or references

No response

Contribution

• I would be open to helping implement this.