bugfix: some minor ui updates for invitation history dialog.

frontend/src/app/(dashboard)/staff/page.tsx

@@ -17,6 +17,7 @@ import {
   type FeaturePermState,
 } from '../../../components/staff/staff-permission-form';
 import { Pencil, Trash2, Copy, Check, X } from 'lucide-react';
+import { DialogCloseButton } from '@/components/ui/common/DialogCloseButton';
 import { useAuth } from '@/lib/hooks/useAuth';
 import { staffApi, type StaffMemberDto } from '@/lib/api/staff';
 import { Button } from '@/components/ui/common/Button';
@@ -603,9 +604,12 @@ export default function StaffPage() {
             aria-modal="true"
             aria-labelledby="invite-staff-title"
           >
-            <h2 id="invite-staff-title" className="text-lg font-semibold text-text-primary">
-              Invite team member
-            </h2>
+            <div className="flex items-start justify-between gap-3">
+              <h2 id="invite-staff-title" className="text-lg font-semibold text-text-primary pr-2">
+                Invite team member
+              </h2>
+              <DialogCloseButton onClick={() => setInviteOpen(false)} />
+            </div>
             <Input
               label="Email"
               type="email"
@@ -650,7 +654,10 @@ export default function StaffPage() {
             role="dialog"
             aria-modal="true"
           >
-            <h2 className="text-lg font-semibold text-text-primary">Edit member</h2>
+            <div className="flex items-start justify-between gap-3">
+              <h2 className="text-lg font-semibold text-text-primary pr-2">Edit member</h2>
+              <DialogCloseButton onClick={() => setEditing(null)} />
+            </div>
             <p className="text-xs text-text-muted">{editing.email}</p>
             <Input label="Display name" value={editName} onChange={(e) => setEditName(e.target.value)} />
             <div>