Добавить кнопку скачивания QR в lightbox

Файл сохраняется как <сервер>-<пользователь>.png.

roles/hysteria2/templates/export/global-index.html.j2

@@ -313,6 +313,34 @@
       font-size: 0.75rem;
       color: var(--muted);
     }
+    .lightbox-actions {
+      margin-top: 1rem;
+      display: flex;
+      justify-content: center;
+    }
+    .lightbox-download {
+      display: inline-flex;
+      align-items: center;
+      gap: 0.45rem;
+      padding: 0.55rem 1rem;
+      border-radius: 999px;
+      border: 1px solid var(--border);
+      background: var(--bg-input);
+      color: var(--accent);
+      text-decoration: none;
+      font-size: 0.85rem;
+      font-weight: 650;
+      transition: color 0.15s, border-color 0.15s, background 0.15s;
+    }
+    .lightbox-download:hover {
+      border-color: var(--accent);
+      background: var(--accent-soft);
+    }
+    .lightbox-download svg {
+      width: 16px;
+      height: 16px;
+      flex-shrink: 0;
+    }
     .lightbox-close {
       position: absolute;
       top: 0.65rem;
@@ -459,6 +487,7 @@
               tabindex="0"
               data-lightbox-src="{{ server.dir | e }}/{{ user.name | e }}.png"
               data-lightbox-caption="{{ server.name | e }} · {{ user.name | e }}"
+              data-lightbox-download="{{ server.name | e }}-{{ user.name | e }}.png"
               aria-label="Открыть QR-код {{ user.name | e }}"
             >
           </div>
@@ -487,6 +516,12 @@
       <button type="button" class="lightbox-close" id="lightbox-close" aria-label="Закрыть">&times;</button>
       <img id="lightbox-img" src="" alt="">
       <p class="lightbox-caption" id="lightbox-caption"></p>
+      <div class="lightbox-actions">
+        <a class="lightbox-download" id="lightbox-download" href="#" download>
+          <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M21 15v4a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2v-4"/><polyline points="7 10 12 15 17 10"/><line x1="12" y1="15" x2="12" y2="3"/></svg>
+          Скачать QR
+        </a>
+      </div>
       <p class="lightbox-hint">Клик вне QR или Esc — закрыть</p>
     </div>
   </div>
@@ -521,11 +556,15 @@
       var img = document.getElementById('lightbox-img');
       var caption = document.getElementById('lightbox-caption');
       var closeBtn = document.getElementById('lightbox-close');
+      var downloadBtn = document.getElementById('lightbox-download');
 
-      function openLightbox(src, text, alt) {
+      function openLightbox(src, text, alt, filename) {
         img.src = src;
         img.alt = alt || text || 'QR';
         caption.textContent = text || '';
+        downloadBtn.href = src;
+        downloadBtn.setAttribute('download', filename || 'qr.png');
+        downloadBtn.setAttribute('aria-label', 'Скачать ' + (filename || 'qr.png'));
         box.classList.add('open');
         box.setAttribute('aria-hidden', 'false');
         document.body.classList.add('lightbox-open');
@@ -537,11 +576,17 @@
         box.setAttribute('aria-hidden', 'true');
         document.body.classList.remove('lightbox-open');
         img.removeAttribute('src');
+        downloadBtn.removeAttribute('href');
       }
 
       document.querySelectorAll('[data-lightbox-src]').forEach(function (el) {
         function openFromEl() {
-          openLightbox(el.getAttribute('data-lightbox-src'), el.getAttribute('data-lightbox-caption'), el.getAttribute('alt'));
+          openLightbox(
+            el.getAttribute('data-lightbox-src'),
+            el.getAttribute('data-lightbox-caption'),
+            el.getAttribute('alt'),
+            el.getAttribute('data-lightbox-download')
+          );
         }
         el.addEventListener('click', openFromEl);
         el.addEventListener('keydown', function (e) {