Render portrait thumbnails as squares on mobile

A bit too small otherwise

app/components/place-photos-carousel.gjs

@@ -116,7 +116,8 @@ export default class PlacePhotosCarousel extends Component {
           {{#each this.photos as |photo|}}
             {{! template-lint-disable no-inline-styles }}
             <div
-              class="carousel-slide"
+              class="carousel-slide
+                {{if photo.isLandscape 'landscape' 'portrait'}}"
               style={{photo.style}}
               data-event-id={{photo.eventId}}
             >

app/styles/app.css

@@ -1006,10 +1006,17 @@ abbr[title] {
     flex: 0 0 auto;
     height: 100px;
     width: auto;
-    aspect-ratio: var(--slide-ratio, 16 / 9);
     scroll-snap-align: none;
   }
 
+  .carousel-slide.landscape {
+    aspect-ratio: var(--slide-ratio, 16 / 9);
+  }
+
+  .carousel-slide.portrait {
+    aspect-ratio: 1 / 1;
+  }
+
   .carousel-placeholder {
     display: block;
     background-color: var(--hover-bg);