Repairs list now has a filter panel with status (defaults to active only),
condition, batch/individual toggle, and date range filters for intake and
promised dates. Added Batch column to the repairs table. Backend list
endpoint accepts filter query params for status, condition, dates, and
batch membership. Template management page (admin only) with CRUD for
common repair services (rehair, string change, etc.) with instrument
type, size, and default pricing. Sidebar updated with Repair Templates
link gated on repairs.admin permission.
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