fix db relations + display sandboxes on dash

frontend/lib/types.ts

@@ -0,0 +1,15 @@
+// DB Types
+
+export type User = {
+  id: string
+  name: string
+  email: string
+}
+
+export type Sandbox = {
+  id: string
+  name: string
+  type: "react" | "node"
+  bucket: string | null
+  userId: string
+}