repo is preferred in our codebase

[Caleb-T-Owens]

ICBA to typ repo unabrv.

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This is part 1 of 2 in a stack made with GitButler:

•  2  caleb/persist-temporary-change-ids #13692
•  1  repo is preferred in our codebase #13691 👈

[Copilot]

Pull request overview

This PR standardizes naming in the Rust rebase API by renaming SuccessfulRebase::repository() to SuccessfulRebase::repo(), aligning it with the existing Editor::repo() convention in but-rebase and the broader codebase’s “repo” terminology.

Changes:

• Renamed SuccessfulRebase accessor from repository() to repo() in but-rebase.
• Updated but-api call sites to use rebase.repo() when building preview/workspace state.
• Updated uncommit flows to use the new accessor for dry-run preview paths.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
crates/but-rebase/src/graph_rebase/mod.rs	Renames the SuccessfulRebase repository accessor to repo() to match existing conventions.
crates/but-api/src/workspace_state.rs	Updates workspace-state construction to call rebase.repo() for preview graphs.
crates/but-api/src/commit/uncommit.rs	Updates uncommit dry-run paths to use rebase.repo() / outcome.rebase.repo().