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/title_bar/src/title_bar.rs

@@ -23,7 +23,7 @@ use crate::application_menu::{
 use auto_update::AutoUpdateStatus;
 use call::ActiveCall;
 use client::{Client, UserStore, zed_urls};
-use cloud_llm_client::Plan;
+use cloud_llm_client::{Plan, PlanV1, PlanV2};
 use gpui::{
     Action, AnyElement, App, Context, Corner, Element, Entity, Focusable, InteractiveElement,
     IntoElement, MouseButton, ParentElement, Render, StatefulInteractiveElement, Styled,
@@ -668,13 +668,13 @@ impl TitleBar {
                         let user_login = user.github_login.clone();
 
                         let (plan_name, label_color, bg_color) = match plan {
-                            None | Some(Plan::ZedFree | Plan::ZedFreeV2) => {
+                            None | Some(Plan::V1(PlanV1::ZedFree) | Plan::V2(PlanV2::ZedFree)) => {
                                 ("Free", Color::Default, free_chip_bg)
                             }
-                            Some(Plan::ZedProTrial | Plan::ZedProTrialV2) => {
+                            Some(Plan::V1(PlanV1::ZedProTrial) | Plan::V2(PlanV2::ZedProTrial)) => {
                                 ("Pro Trial", Color::Accent, pro_chip_bg)
                             }
-                            Some(Plan::ZedPro | Plan::ZedProV2) => {
+                            Some(Plan::V1(PlanV1::ZedPro) | Plan::V2(PlanV2::ZedPro)) => {
                                 ("Pro", Color::Accent, pro_chip_bg)
                             }
                         };