git_graph: Add context menu operations

[nguyenphutrong]

Summary

• Add Git Graph context menus for commit rows and branch/tag/stash chips.
• Add operation dialogs and backend API support for push, checkout, branch creation, cherry-pick, revert, reset, merge, rebase, and stash/ref actions.
• Improve context menu responsiveness and prevent Git Graph scrolling while a context menu is open.

Tests

• cargo fmt --all
• cargo test -p git_graph
• cargo check -p git_graph
• cargo check -p project
• git diff --check

Suggested .rules additions

• In git_graph, context-menu scroll blocking needs to cover both graph canvas handlers and table uniform_list().track_scroll(...); blocking only handle_graph_scroll does not stop table wheel events.

Release Notes:

• Improved Git Graph context menu operations and responsiveness.

[MrSubidubi]

I see this was discussed in the original PR already, but I heavily suspect this would be easier for @Anthony-Eid to review and get merged if this was split into smaller chunks, as this will get conflicts quickly. Will leave the final verdict to him but wanted to mention it already nonetheless

[nguyenphutrong]

Hi @JosephTLyons, could you please take a look at this PR when you have a chance?

It looks like #56110 and #56354 were developed in parallel with this PR, so there are now quite a few conflicts between the branches. Some of the original context/discussion is also in #53316.

If possible, could you review this PR and, if it makes sense, pull these changes into your branch and make the necessary adjustments there? Since your newer PRs already touch the conflicting areas, I think that would be the safest way to resolve this without accidentally dropping behavior from either side.

Thanks.

[JosephTLyons]

Hey @nguyenphutrong

Sorry it's taken me so long to get back to you.

I decided not to merge your changes into my custom git commands branch because this PR is quite large, and ultimately it would've required a second person at Zed to review my branch alongside all of these changes.

I think this PR still needs to be broken up into multiple PRs, with each one scoped to a single fix or enhancement. I also think each item should be discussed beforehand so we can make sure the team is on board (with the feature in general, and with the implementation) before we add it.

Since all of these features touch the same area of the code, it's probably best to avoid opening multiple PRs here at once — otherwise your own PRs will likely conflict with each other as they get squash-merged into main.

As a first step, I'd be happy to review a PR scoped to just your fix for not scrolling the git graph while the context menu is open, and we can go from there. I think for that fix should be applied centrally. Any list that scrolls and has entries that have context menus, should be blocked from scrolling when the context menu is open.

[serajhqi]

@nguyenphutrong I’m eagerly waiting for these awesome changes.