Batch create form now uses searchable account picker (same as ticket
intake) instead of a dropdown. Batch detail shows + Add Repair button
that creates a ticket pre-linked to the batch. Repair count and total
estimate auto-calculated from linked tickets. Batch PDF generates a
summary with all repairs, statuses, estimates, and grand total. Added
Mark Delivered button for completed batches. New repair form shows
batch badge when linked from a batch.
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