Adds treasures

src/components/documents/DocumentForm.tsx

@@ -1,5 +1,6 @@
 import { RelationshipType, type CampaignId, type Document } from "@/lib/types";
 import { SecretForm } from "./secret/SecretForm";
+import { TreasureForm } from "./treasure/TreasureForm";
 
 function assertUnreachable(_x: never): never {
   throw new Error("DocumentForm switch is not exhaustive");
@@ -22,6 +23,8 @@ export const DocumentForm = ({
       return <SecretForm campaign={campaignId} onCreate={onCreate} />;
     case RelationshipType.DiscoveredIn:
       return "Form not supported here";
+    case RelationshipType.Treasures:
+      return <TreasureForm campaign={campaignId} onCreate={onCreate} />;
   }
 
   return assertUnreachable(relationshipType);