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/roles/$roleId.tsx

@@ -100,7 +100,7 @@ function RoleDetailPage() {
   return (
     <div className="space-y-6 max-w-2xl">
       <div className="flex items-center gap-3">
-        <Button variant="ghost" size="sm" onClick={() => navigate({ to: '/roles', search: {} as Record<string, unknown> })}>
+        <Button variant="ghost" size="sm" onClick={() => navigate({ to: '/roles', search: { page: 1, limit: 25, q: undefined, sort: undefined, order: 'asc' as const } })}>
           <ArrowLeft className="h-4 w-4" />
         </Button>
         <div>
@@ -177,7 +177,7 @@ function RoleDetailPage() {
         <Button onClick={handleSave} disabled={updateMutation.isPending}>
           {updateMutation.isPending ? 'Saving...' : 'Save Changes'}
         </Button>
-        <Button variant="secondary" onClick={() => navigate({ to: '/roles', search: {} as Record<string, unknown> })}>
+        <Button variant="secondary" onClick={() => navigate({ to: '/roles', search: { page: 1, limit: 25, q: undefined, sort: undefined, order: 'asc' as const } })}>
           Cancel
         </Button>
       </div>

packages/admin/src/routes/_authenticated/roles/new.tsx

@@ -29,7 +29,7 @@ function NewRolePage() {
     onSuccess: () => {
       queryClient.invalidateQueries({ queryKey: rbacKeys.roles })
       toast.success('Role created')
-      navigate({ to: '/roles', search: {} as Record<string, unknown> })
+      navigate({ to: '/roles', search: { page: 1, limit: 25, q: undefined, sort: undefined, order: 'asc' as const } })
     },
     onError: (err) => toast.error(err.message),
   })
@@ -153,7 +153,7 @@ function NewRolePage() {
         <Button onClick={handleSubmit} disabled={mutation.isPending}>
           {mutation.isPending ? 'Creating...' : 'Create Role'}
         </Button>
-        <Button variant="secondary" onClick={() => navigate({ to: '/roles', search: {} as Record<string, unknown> })}>
+        <Button variant="secondary" onClick={() => navigate({ to: '/roles', search: { page: 1, limit: 25, q: undefined, sort: undefined, order: 'asc' as const } })}>
           Cancel
         </Button>
       </div>