feat: implement hide app name feature with toggle in admin settings and update branding context

src/components/BrandLogo.jsx

@@ -8,7 +8,7 @@ const sizes = {
 };
 
 export default function BrandLogo({ size = 'md', className = '' }) {
-  const { appName, hasLogo, logoUrl } = useBranding();
+  const { appName, hasLogo, logoUrl, hideAppName } = useBranding();
   const s = sizes[size] || sizes.md;
 
   if (hasLogo && logoUrl) {
@@ -19,7 +19,7 @@ export default function BrandLogo({ size = 'md', className = '' }) {
           alt={appName}
           className={`${s.box} ${s.rounded} object-contain`}
         />
-        <span className={`${s.text} font-bold gradient-text`}>{appName}</span>
+        {!hideAppName && <span className={`${s.text} font-bold gradient-text`}>{appName}</span>}
       </div>
     );
   }

src/components/DateTimePicker.jsx

@@ -0,0 +1,126 @@
+import ReactDatePicker from 'react-datepicker';
+import { de } from 'date-fns/locale';
+import { Calendar as CalendarIcon, Clock, X } from 'lucide-react';
+import { forwardRef } from 'react';
+import 'react-datepicker/dist/react-datepicker.css';
+
+/**
+ * Custom DateTimePicker that reads the app's CSS variables and
+ * fully matches whatever theme is active.
+ *
+ * Props:
+ *   value      – ISO datetime string (or '')
+ *   onChange   – (isoString) => void
+ *   label      – string
+ *   required   – bool
+ *   minDate    – Date | null
+ *   icon       – 'calendar' (default) | 'clock'
+ */
+export default function DateTimePicker({
+  value,
+  onChange,
+  label,
+  required = false,
+  minDate = null,
+  icon = 'calendar',
+}) {
+  const selected = value ? new Date(value) : null;
+
+  const handleChange = (date) => {
+    if (!date) { onChange(''); return; }
+    // Produce local datetime string yyyy-MM-ddTHH:mm
+    const y = date.getFullYear();
+    const mo = String(date.getMonth() + 1).padStart(2, '0');
+    const d = String(date.getDate()).padStart(2, '0');
+    const h = String(date.getHours()).padStart(2, '0');
+    const mi = String(date.getMinutes()).padStart(2, '0');
+    onChange(`${y}-${mo}-${d}T${h}:${mi}`);
+  };
+
+  const Icon = icon === 'clock' ? Clock : CalendarIcon;
+
+  return (
+    <div className="dtp-wrapper">
+      {label && (
+        <label className="block text-sm font-medium text-th-text mb-1.5">
+          {label}{required && ' *'}
+        </label>
+      )}
+      <div className="dtp-input-wrap">
+        <Icon size={15} className="dtp-icon" />
+        <ReactDatePicker
+          selected={selected}
+          onChange={handleChange}
+          showTimeSelect
+          timeFormat="HH:mm"
+          timeIntervals={15}
+          dateFormat="dd.MM.yyyy  HH:mm"
+          locale={de}
+          minDate={minDate}
+          required={required}
+          popperPlacement="bottom-start"
+          popperModifiers={[
+            { name: 'offset', options: { offset: [0, 4] } },
+            { name: 'preventOverflow', options: { rootBoundary: 'viewport', tether: false, altAxis: true } },
+          ]}
+          customInput={<CustomInput />}
+          calendarClassName="dtp-calendar"
+          dayClassName={(date) => 'dtp-day'}
+          timeClassName={() => 'dtp-time-item'}
+          renderCustomHeader={CalendarHeader}
+          isClearable
+          clearButtonClassName="dtp-clear-btn"
+          wrapperClassName="dtp-dp-wrapper"
+        />
+      </div>
+    </div>
+  );
+}
+
+// ── Custom Input ─────────────────────────────────────────────────────────────
+const CustomInput = forwardRef(({ value, onClick, onClear, ...rest }, ref) => (
+  <button
+    ref={ref}
+    type="button"
+    onClick={onClick}
+    className="dtp-custom-input"
+    {...rest}
+  >
+    <span className={value ? 'dtp-value' : 'dtp-placeholder'}>
+      {value || 'Datum & Uhrzeit wählen …'}
+    </span>
+  </button>
+));
+CustomInput.displayName = 'CustomInput';
+
+// ── Custom Header ─────────────────────────────────────────────────────────────
+function CalendarHeader({
+  date,
+  decreaseMonth, increaseMonth,
+  prevMonthButtonDisabled, nextMonthButtonDisabled,
+}) {
+  const label = date.toLocaleString('de', { month: 'long', year: 'numeric' });
+  return (
+    <div className="dtp-header">
+      <button
+        type="button"
+        onClick={decreaseMonth}
+        disabled={prevMonthButtonDisabled}
+        className="dtp-nav-btn"
+        aria-label="Vorheriger Monat"
+      >
+        ‹
+      </button>
+      <span className="dtp-month-label">{label}</span>
+      <button
+        type="button"
+        onClick={increaseMonth}
+        disabled={nextMonthButtonDisabled}
+        className="dtp-nav-btn"
+        aria-label="Nächster Monat"
+      >
+        ›
+      </button>
+    </div>
+  );
+}