fixed some warnings

site/src/components/ActivityDetail.svelte

@@ -108,12 +108,18 @@
       >‹</button>
     {/if}
 
-    <img
-      src={imageBase + galleryImages[lightboxIndex]}
-      alt={galleryImages[lightboxIndex]}
-      class="max-h-[90vh] max-w-[90vw] rounded-lg shadow-2xl object-contain"
+    <button
+      type="button"
+      class="contents"
       on:click|stopPropagation
-    />
+      aria-label="Image {lightboxIndex + 1} of {galleryImages.length}"
+    >
+      <img
+        src={imageBase + galleryImages[lightboxIndex]}
+        alt={galleryImages[lightboxIndex]}
+        class="max-h-[90vh] max-w-[90vw] rounded-lg shadow-2xl object-contain"
+      />
+    </button>
 
     <!-- Next -->
     {#if galleryImages.length > 1}
@@ -241,7 +247,7 @@
     <ActivityCharts timeseries={detail.timeseries} bind:hoveredIdx {athlete} />
   </div>
 {:else if !detail}
-  <div class="bg-zinc-900 rounded-xl border border-zinc-800 p-4 h-32 animate-pulse" />
+  <div class="bg-zinc-900 rounded-xl border border-zinc-800 p-4 h-32 animate-pulse"></div>
 {/if}
 
 <!-- Laps -->