fix: correct TanStack Router search types for all navigate/Link calls

Each destination route's search must match its validateSearch shape exactly:
- Detail pages (tab-based): { tab: '...' }
- List pages with extra filters: include status, instructorId, view, categoryId etc.
- Form pages (enrollments/new, repairs/new): include only their specific fields
- use-pagination.ts: fix search reducer to use (prev: any) instead of invalid cast

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

packages/admin/src/routes/_authenticated/lessons/enrollments/new.tsx

@@ -108,7 +108,7 @@ function NewEnrollmentPage() {
     },
     onSuccess: (enrollment) => {
       toast.success('Enrollment created')
-      navigate({ to: '/lessons/enrollments/$enrollmentId', params: { enrollmentId: enrollment.id }, search: { page: 1, limit: 25, q: undefined, sort: undefined, order: 'asc' as const } })
+      navigate({ to: '/lessons/enrollments/$enrollmentId', params: { enrollmentId: enrollment.id }, search: { tab: 'details' } })
     },
     onError: (err) => toast.error(err.message),
   })
@@ -141,7 +141,7 @@ function NewEnrollmentPage() {
   return (
     <div className="space-y-6 max-w-2xl">
       <div className="flex items-center gap-3">
-        <Button variant="ghost" size="sm" onClick={() => navigate({ to: '/lessons/enrollments', search: { page: 1, limit: 25, q: undefined, sort: undefined, order: 'asc' as const } })}>
+        <Button variant="ghost" size="sm" onClick={() => navigate({ to: '/lessons/enrollments', search: { page: 1, limit: 25, q: undefined, sort: undefined, order: 'desc' as const, status: undefined, instructorId: undefined } })}>
           <ArrowLeft className="h-4 w-4" />
         </Button>
         <h1 className="text-2xl font-bold">New Enrollment</h1>
@@ -282,7 +282,7 @@ function NewEnrollmentPage() {
           <Button type="submit" disabled={mutation.isPending || !selectedMember || !selectedSlotId || !startDate} size="lg">
             {mutation.isPending ? 'Creating...' : 'Create Enrollment'}
           </Button>
-          <Button variant="secondary" type="button" size="lg" onClick={() => navigate({ to: '/lessons/enrollments', search: { page: 1, limit: 25, q: undefined, sort: undefined, order: 'asc' as const } })}>
+          <Button variant="secondary" type="button" size="lg" onClick={() => navigate({ to: '/lessons/enrollments', search: { page: 1, limit: 25, q: undefined, sort: undefined, order: 'desc' as const, status: undefined, instructorId: undefined } })}>
             Cancel
           </Button>
         </div>