Add justified photo grid layout with lazy loading and image dimensions.

photo21/static/layout.css

@@ -45,6 +45,29 @@ SPDX-License-Identifier: GPL-3.0-or-later
   background-color: rgba(163, 163, 163, 0.274);
 }
 
+/* Gallery - Google Photos style justified grid */
+#lightgallery {
+  position: relative;
+}
+
+.photo-item {
+  position: absolute;
+  overflow: hidden;
+  visibility: hidden;
+}
+
+.photo-item img {
+  width: 100%;
+  height: 100%;
+  object-fit: cover;
+  display: block;
+}
+
+.photo-item img.photo-private {
+  outline: 5px solid var(--bs-danger);
+  outline-offset: -5px;
+}
+
 /* Language selector */
 .lang-select {
   border: none;