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/repairs/$ticketId.tsx

@@ -175,7 +175,7 @@ function RepairTicketDetailPage() {
     <div className="space-y-4 max-w-5xl">
       {/* Header */}
       <div className="flex items-center gap-3">
-        <Button variant="ghost" size="sm" onClick={() => navigate({ to: '/repairs', search: {} as Record<string, unknown> })}>
+        <Button variant="ghost" size="sm" onClick={() => navigate({ to: '/repairs', search: { page: 1, limit: 25, q: undefined, sort: undefined, order: 'asc' as const } })}>
           <ArrowLeft className="h-4 w-4" />
         </Button>
         <div className="flex-1">