fix: replace invalid TanStack Router search casts with typed defaults

Newer TanStack Router enforces strict types on search params — 'search: {} as Record<string, unknown>' no longer satisfies routes with validateSearch. Replace all occurrences with the correct search shape for each destination route (pagination defaults for list routes, tab/field defaults for detail routes).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

packages/admin/src/routes/_authenticated/repair-batches/$batchId.tsx

@@ -96,12 +96,12 @@ function RepairBatchDetailPage() {
   const totalActual = tickets.reduce((sum, t) => sum + (t.actualCost ? parseFloat(t.actualCost) : 0), 0)
 
   function handleTicketClick(ticket: RepairTicket) {
-    navigate({ to: '/repairs/$ticketId', params: { ticketId: ticket.id }, search: {} as Record<string, unknown> })
+    navigate({ to: '/repairs/$ticketId', params: { ticketId: ticket.id }, search: { page: 1, limit: 25, q: undefined, sort: undefined, order: 'asc' as const } })
   }
 
   function handleAddRepair() {
     // Navigate to new repair with batch and account pre-linked
-    navigate({ to: '/repairs/new', search: { batchId, batchName: batch!.batchNumber ?? '', accountId: batch!.accountId, contactName: batch!.contactName ?? '' } as Record<string, unknown> })
+    navigate({ to: '/repairs/new', search: { batchId, batchName: batch!.batchNumber ?? '', accountId: batch!.accountId, contactName: batch!.contactName ?? '' } })
   }
 
   async function generateBatchPdf() {
@@ -233,7 +233,7 @@ function RepairBatchDetailPage() {
   return (
     <div className="space-y-6 max-w-5xl">
       <div className="flex items-center gap-3">
-        <Button variant="ghost" size="sm" onClick={() => navigate({ to: '/repair-batches', search: {} as Record<string, unknown> })}>
+        <Button variant="ghost" size="sm" onClick={() => navigate({ to: '/repair-batches', search: { page: 1, limit: 25, q: undefined, sort: undefined, order: 'asc' as const } })}>
           <ArrowLeft className="h-4 w-4" />
         </Button>
         <div className="flex-1">