use gix::Id::shorten for legacy commit display IDs in but CLI

[Byron]

Tasks

• review
  • double-check usages of lead,rest print
• make it fast

Review Notes

but oplog changed as I am using uniformly shortened commit-ids instead.

Compare after and before.

To my mind, there is no need for the extra coloring, particularly now where the shortening takes care of disambiguating prefixes, while respecting core.abbrev.

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[Copilot]

Pull request overview

This PR updates the but CLI’s legacy command output to use gix’s repository-aware commit ID shortening (honoring core.abbrev and disambiguation), replacing fixed [..7] slicing and improving performance in high-volume display paths.

Changes:

• Add shared commit/object-id helpers (shorten_object_id, shorten_hex_object_id, split_short_id) and wire them into legacy CLI output.
• Introduce RepositoryExt::for_commit_shortening() to avoid ODB refresh overhead when only shortening IDs for display.
• Update relevant legacy commands and one snapshot test expectation to reflect the new abbreviated-ID formatting.

Reviewed changes

Copilot reviewed 24 out of 24 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
crates/but/tests/but/command/commit.rs	Updates oplog snapshot expectation to use the new short-hash placeholder.
crates/but/src/utils/object_id.rs	Adds shared helpers for repo-disambiguated object-id shortening and display splitting.
crates/but/src/utils/mod.rs	Re-exports the new object-id helper utilities.
crates/but/src/id/mod.rs	Exposes ShortId alias for use outside the id module.
crates/but/src/command/legacy/teardown.rs	Uses repo-aware shortening for snapshot/commit IDs in human output.
crates/but/src/command/legacy/status/mod.rs	Switches multiple commit-id displays to repo-aware shortening; updates assignment/commit rendering to avoid brittle slicing.
crates/but/src/command/legacy/show.rs	Uses repo-aware shortening for branch commit lists.
crates/but/src/command/legacy/rub/undo.rs	Uses repo-aware shortening when printing the uncommitted commit ID.
crates/but/src/command/legacy/rub/squash.rs	Uses repo-aware shortening in squash result output.
crates/but/src/command/legacy/rub/move_commit.rs	Uses repo-aware shortening in move-to-branch output.
crates/but/src/command/legacy/rub/move.rs	Uses repo-aware shortening in move-related human and JSON hint messages.
crates/but/src/command/legacy/rub/mod.rs	Uses repo-aware shortening in disambiguation prompts; adds repo config for fast shortening.
crates/but/src/command/legacy/rub/amend.rs	Uses repo-aware shortening + split styling for amended commit IDs.
crates/but/src/command/legacy/resolve.rs	Uses repo-aware shortening in conflict-resolution messages and errors.
crates/but/src/command/legacy/push.rs	Uses repo-aware shortening for push previews and SHA update output; configures repo for fast shortening where appropriate.
crates/but/src/command/legacy/pull/mod.rs	Uses repo-aware shortening for upstream commit displays; configures repo for fast shortening.
crates/but/src/command/legacy/pick.rs	Uses repo-aware shortening for user-facing picked-commit output and conflict messages; configures repo for fast shortening.
crates/but/src/command/legacy/oplog.rs	Uses repo-aware shortening/length selection for oplog commit IDs; configures repo for fast shortening.
crates/but/src/command/legacy/merge.rs	Uses repo-aware shortening in merge progress output.
crates/but/src/command/legacy/commit.rs	Uses repo-aware shortening in “insert blank commit” success message.
crates/but/src/command/legacy/branch/show.rs	Uses repo-aware shortening for commit lists shown in branch show output.
crates/but/src/command/legacy/branch/mod.rs	Uses repo-aware shortening when displaying anchor commit IDs.
crates/but/src/command/legacy/absorb.rs	Passes a repo configured for fast shortening into absorption plan display and shortens commit IDs via helper.
crates/but-core/src/repo_ext.rs	Adds for_commit_shortening() (sets ODB refresh mode to Never) and reorders impl blocks accordingly.

[Byron]

Only this method was added.

All the other changes are an automatic "align implementation order with declaration order" refactor offered by RA.