Adds the missing form control for the auto-sync mode introduced by the
merger hook. Lives next to Direct merge commit routing / Integration
worktree inside the merge-strategy panel and only renders when
mergeStrategy === "direct". Three options with descriptions cribbed from
docs/settings-reference.md:
- Stash + fast-forward (default): preserve local edits across the snap
- Fast-forward only: skip dirty worktrees, surface the banner instead
- Off: legacy behavior; project root stays stale until manual pull
Value is normalized through normalizeMergeAdvanceAutoSyncMode on both the
merged-settings and scoped-settings load paths so a missing/invalid
stored value cleanly falls back to the default.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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