* Reorder source control to show staged changes first by default
Stages are closest to the commit action and most relevant to the
commit workflow. Merges untracked files into Changes visually while
preserving their Git area. Removes the untracked-first preset and
includes migration logic for existing user settings.
* Drop source control group order user preference
Remove the sourceControlGroupOrder setting and related UI, migrations, and persistence logic. The source control view now always displays sections in the order: staged changes, unstaged changes, untracked files.
* Reorder source control to show changes before staged
Aligns with the edit-stage-commit workflow by showing unstaged
changes (active edits) before staged changes (queued for commit).
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