fix: use commit as the default git action without origin

[binbandit]

Summary

• track whether the repository has an origin remote in git branch metadata
• fall back to Commit for the primary git action when a branch has no upstream and no origin remote
• disable push/PR affordances that cannot succeed without origin, and cover the new behavior with UI and git-layer tests

Validation

• bun lint
• bun typecheck

Note

Use commit as the default git action when no origin remote is configured

• Adds hasOriginRemote to GitListBranchesResult (contract, server, and client) to indicate whether a remote named origin is configured.
• resolveQuickAction falls back to a Commit action (instead of Push) when there are local changes but no upstream and no origin remote.
• buildMenuItems disables Push and Create PR when there is no upstream and no origin remote, showing a tooltip hint to add an origin remote.
• Behavioral Change: repos without an origin remote now default to commit-only flows; push and PR actions are disabled until origin is added.

^{Macroscope summarized 1f1e1e4.}

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[binbandit]

@juliusmarminge good to go now