Add MIST to organizations

MIST (https://huggingface.co/mist-models) is a family of scientific foundation models for molecular and formulation property prediction developed by the University of Michigan.

src/constants/organizations.ts

@@ -164,5 +164,10 @@ export const ORGANIZATIONS: ProviderInfo[] = [
     color: "#65B204", 
     authors: ["Major-TOM"],
     tags: ["climate"]
-  }
+  },
+  { 
+    color: "#00274C", 
+    authors: ["mist-models"],
+    tags: ["chemistry", "materials-science"]
+  },
 ];