Refresh the homepage and improve export and draft guidance

artifacts-api-smoke.json

@@ -0,0 +1,11 @@
+{
+  "passed": true,
+  "checks": [
+    "production homepage/catalog/downloads/assets",
+    "Java uploader to real Supabase Storage",
+    "private draft before rendered assets exist",
+    "guests denied private drafts",
+    "cancel queued processing",
+    "cancel unfinished upload without a queue row"
+  ]
+}