refactor: migrace vsech formularu na FormField komponentu + JWT upgrade

- FormField.jsx: pridana podpora style prop
- 23 stranek migrovano na FormField (166 vyskytu, -246 radku)
- firebase/php-jwt upgrade v6.11 -> v7.0.3 (security advisory fix)

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

src/admin/pages/AttendanceHistory.jsx

@@ -6,6 +6,7 @@ import Forbidden from '../components/Forbidden'
 import { motion } from 'framer-motion'
 import AdminDatePicker from '../components/AdminDatePicker'
 import { formatDate, formatDatetime, formatTime, calculateWorkMinutes, formatMinutes, getLeaveTypeName, getLeaveTypeBadgeClass, calculateWorkMinutesPrint, formatTimeOrDatetimePrint } from '../utils/attendanceHelpers'
+import FormField from '../components/FormField'
 import apiFetch from '../utils/api'
 
 const API_BASE = '/api/admin'
@@ -242,14 +243,13 @@ export default function AttendanceHistory() {
       >
         <div className="admin-card-body">
           <div className="admin-form-row">
-            <div className="admin-form-group" style={{ marginBottom: 0 }}>
-              <label className="admin-form-label">Měsíc</label>
+            <FormField label="Měsíc">
               <AdminDatePicker
                 mode="month"
                 value={month}
                 onChange={(val) => setMonth(val)}
               />
-            </div>
+            </FormField>
           </div>
         </div>
       </motion.div>