Make plans backwards compatible (#37941)

This PR fixes the backwards compatibility of the new `Plan` variants.

We can't add new variants to the wire representation, as old clients
won't be able to understand them.

Release Notes:

- N/A

crates/client/src/user.rs

@@ -5,7 +5,8 @@ use cloud_api_client::websocket_protocol::MessageToClient;
 use cloud_api_client::{GetAuthenticatedUserResponse, PlanInfo};
 use cloud_llm_client::{
     EDIT_PREDICTIONS_USAGE_AMOUNT_HEADER_NAME, EDIT_PREDICTIONS_USAGE_LIMIT_HEADER_NAME,
-    MODEL_REQUESTS_USAGE_AMOUNT_HEADER_NAME, MODEL_REQUESTS_USAGE_LIMIT_HEADER_NAME, UsageLimit,
+    MODEL_REQUESTS_USAGE_AMOUNT_HEADER_NAME, MODEL_REQUESTS_USAGE_LIMIT_HEADER_NAME, Plan,
+    UsageLimit,
 };
 use collections::{HashMap, HashSet, hash_map::Entry};
 use derive_more::Deref;
@@ -692,20 +693,22 @@ impl UserStore {
         self.current_user.borrow().clone()
     }
 
-    pub fn plan(&self) -> Option<cloud_llm_client::Plan> {
+    pub fn plan(&self) -> Option<Plan> {
         #[cfg(debug_assertions)]
         if let Ok(plan) = std::env::var("ZED_SIMULATE_PLAN").as_ref() {
+            use cloud_llm_client::PlanV1;
+
             return match plan.as_str() {
-                "free" => Some(cloud_llm_client::Plan::ZedFree),
-                "trial" => Some(cloud_llm_client::Plan::ZedProTrial),
-                "pro" => Some(cloud_llm_client::Plan::ZedPro),
+                "free" => Some(Plan::V1(PlanV1::ZedFree)),
+                "trial" => Some(Plan::V1(PlanV1::ZedProTrial)),
+                "pro" => Some(Plan::V1(PlanV1::ZedPro)),
                 _ => {
                     panic!("ZED_SIMULATE_PLAN must be one of 'free', 'trial', or 'pro'");
                 }
             };
         }
 
-        self.plan_info.as_ref().map(|info| info.plan)
+        self.plan_info.as_ref().map(|info| info.plan())
     }
 
     pub fn subscription_period(&self) -> Option<(DateTime<Utc>, DateTime<Utc>)> {