Fix machines display on overview; disable inline PDF thumbnails

app/components/DocumentThumbnail.vue

@@ -12,12 +12,6 @@
       loading="lazy"
       decoding="async"
     >
-    <iframe
-      v-else-if="canRenderPdf"
-      :src="previewSrc"
-      class="h-full w-full border-0 bg-white"
-      title="Aperçu PDF"
-    />
     <component
       v-else
       :is="icon.component"
@@ -54,8 +48,6 @@ const props = defineProps<{
   alt?: string;
 }>();
 
-const PDF_PREVIEW_MAX_BYTES = 5 * 1024 * 1024;
-
 const normalizedDocument = computed(() => props.document ?? null);
 
 const canRenderImage = computed(() => {
@@ -64,14 +56,9 @@ const canRenderImage = computed(() => {
 });
 
 const canRenderPdf = computed(() => {
-  const doc = normalizedDocument.value;
-  if (!doc || !isPdfDocument(doc) || !doc.path) {
-    return false;
-  }
-  if (typeof doc.size === 'number' && doc.size > PDF_PREVIEW_MAX_BYTES) {
-    return false;
-  }
-  return true;
+  // Rendering many PDF iframes in a list is very heavy for the browser.
+  // We intentionally disable inline PDF previews and fall back to an icon.
+  return false;
 });
 
 const appendPdfViewerParams = (src: string) => {