feat: implement nested routes for loaner form

We're using this as our testing ground before attempting to refactor all other pages as well.

src/common/mod.rs

@@ -5,5 +5,6 @@ mod form_schema;
 mod user;
 mod value_type;
 mod submit_status;
+pub mod animations;
 
 pub use self::{comparison::*, expandable_info::*, form_schema::*, user::*, value_type::*, form_params::*, submit_status::*};