Clean up all references to authenticatedData

- De facto, was being assumed everywhere if authenticatedData is null, that it's not logged in. This isn't true because the data can still be loading. Update the hook to send additional states.
- Bonus: Delete model picker code and a slew of unused imports.

src/interface/web/app/common/auth.ts

@@ -19,13 +19,11 @@ const fetcher = (url: string) =>
         .catch((err) => console.warn(err));
 
 export function useAuthenticatedData() {
-    const { data, error } = useSWR<UserProfile>("/api/v1/user", fetcher, {
+    const { data, error, isLoading } = useSWR<UserProfile>("/api/v1/user", fetcher, {
         revalidateOnFocus: false,
     });
 
-    if (error || !data || data.detail === "Forbidden") return null;
-
-    return data;
+    return { data, error, isLoading };
 }
 
 export interface ModelOptions {