fix: show copyable enrollment code after issue in Settings

Исправлен v-if, скрывавший весь раздел при success; баннер с полным
кодом, копированием и sessionStorage до Скрыть. Версия 0.9.1.

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/src/views/SettingsView.vue

@@ -7,10 +7,22 @@
     </p>
 
     <p v-if="error" class="error">{{ error }}</p>
-    <p v-if="success" class="success">{{ success }}</p>
-    <p v-else-if="loading">Загрузка…</p>
+    <p v-if="loading">Загрузка…</p>
 
-    <template v-else>
+    <template v-if="!loading">
+      <p v-if="success" class="success">{{ success }}</p>
+
+      <div v-if="lastCreatedCode" class="settings-enrollment-banner" role="status">
+        <p class="settings-enrollment-banner-title">Код регистрации Seaca</p>
+        <p class="settings-enrollment-banner-hint">
+          Скопируйте и передайте оператору вместе с URL сервера. Полный код показывается только сейчас.
+        </p>
+        <div class="settings-enrollment-code-row">
+          <code class="settings-enrollment-code-value">{{ lastCreatedCode }}</code>
+          <button type="button" @click="copyEnrollmentCode">Копировать</button>
+          <button type="button" class="secondary" @click="dismissEnrollmentCode">Скрыть</button>
+        </div>
+      </div>
       <section class="card settings-card settings-policy">
         <h2>Интерфейс</h2>
         <p class="settings-hint settings-hint-top">
@@ -137,9 +149,6 @@
             </button>
           </div>
         </form>
-        <p v-if="lastCreatedCode" class="settings-created-code">
-          Код (скопируйте сейчас): <code>{{ lastCreatedCode }}</code>
-        </p>
         <div class="settings-mobile-table-wrap">
           <table class="settings-severity-table">
             <thead>
@@ -511,6 +520,34 @@ const enrollmentCodes = ref<MobileEnrollmentCode[]>([]);
 const mobileDevices = ref<MobileDevice[]>([]);
 const sacUsers = ref<UserSummary[]>([]);
 const lastCreatedCode = ref("");
+const ENROLLMENT_CODE_STORAGE_KEY = "sac_mobile_last_enrollment_code";
+
+function restoreLastCreatedCode() {
+  const stored = sessionStorage.getItem(ENROLLMENT_CODE_STORAGE_KEY);
+  if (stored) {
+    lastCreatedCode.value = stored;
+  }
+}
+
+function persistLastCreatedCode(code: string) {
+  sessionStorage.setItem(ENROLLMENT_CODE_STORAGE_KEY, code);
+}
+
+function dismissEnrollmentCode() {
+  lastCreatedCode.value = "";
+  sessionStorage.removeItem(ENROLLMENT_CODE_STORAGE_KEY);
+}
+
+async function copyEnrollmentCode() {
+  if (!lastCreatedCode.value) return;
+  error.value = "";
+  try {
+    await navigator.clipboard.writeText(lastCreatedCode.value);
+    success.value = "Код скопирован в буфер обмена.";
+  } catch {
+    error.value = "Не удалось скопировать автоматически — выделите код вручную.";
+  }
+}
 
 const policyForm = reactive({
   min_severity: "warning",
@@ -699,7 +736,6 @@ async function createEnrollmentCode() {
   creatingCode.value = true;
   error.value = "";
   success.value = "";
-  lastCreatedCode.value = "";
   try {
     const created = await createMobileEnrollmentCode({
       label: codeForm.label,
@@ -709,8 +745,8 @@ async function createEnrollmentCode() {
       expires_in_hours: codeForm.expires_in_hours,
     });
     lastCreatedCode.value = created.enrollment_code;
+    persistLastCreatedCode(created.enrollment_code);
     enrollmentCodes.value = await fetchMobileEnrollmentCodes();
-    success.value = "Код регистрации создан.";
     codeForm.label = "";
   } catch (e) {
     error.value = e instanceof Error ? e.message : "Ошибка создания кода";
@@ -953,7 +989,10 @@ async function testEmail() {
   }
 }
 
-onMounted(load);
+onMounted(() => {
+  restoreLastCreatedCode();
+  load();
+});
 </script>
 
 <style scoped>
@@ -1100,9 +1139,42 @@ onMounted(load);
   margin-top: 0.5rem;
 }
 
-.settings-created-code {
-  color: #6dd196;
+.settings-enrollment-banner {
+  margin: 0 0 1.25rem;
+  padding: 1rem 1.1rem;
+  border: 1px solid #3d8b5f;
+  border-radius: 8px;
+  background: #15251c;
+}
+
+.settings-enrollment-banner-title {
+  margin: 0 0 0.35rem;
+  font-size: 1.05rem;
+  font-weight: 600;
+  color: #8ce8b0;
+}
+
+.settings-enrollment-banner-hint {
+  margin: 0 0 0.75rem;
+  color: #a8b8c8;
+  font-size: 0.92rem;
+}
+
+.settings-enrollment-code-row {
+  display: flex;
+  flex-wrap: wrap;
+  align-items: center;
+  gap: 0.5rem;
+}
+
+.settings-enrollment-code-value {
+  flex: 1 1 16rem;
+  padding: 0.55rem 0.65rem;
+  border-radius: 6px;
+  background: #0f1419;
+  color: #e8f0f8;
   word-break: break-all;
+  user-select: all;
 }
 
 .settings-mobile-actions {