fix(manager): match Mission Core landing geometry

apps/device-manager/src/DeviceManagerApp.tsx

@@ -684,6 +684,9 @@ function DeviceStage({
       && primarySections.some((section) => section.value === value)
       && values.indexOf(value) === index
     ));
+  const hasMedia = overview.background.enabled && overview.background.items.some(
+    (item) => Boolean(mediaSource(item)) && Boolean(item.mediaKind),
+  );
   return (
     <div className="device-manager-stage">
       {error ? (
@@ -694,7 +697,10 @@ function DeviceStage({
         </GlassSurface>
       ) : null}
 
-      <GlassSurface className="device-manager-home" padding="lg" tone="soft">
+      <section
+        className="device-manager-home"
+        data-has-media={hasMedia ? "true" : undefined}
+      >
         <EnvironmentBackdrop background={overview.background} />
         <div className="device-manager-home__scrim" aria-hidden="true" />
         <section className="device-manager-hero">
@@ -715,7 +721,7 @@ function DeviceStage({
             </div>
           ) : null}
         </section>
-      </GlassSurface>
+      </section>
     </div>
   );
 }