Add refinements to the AI onboarding flow (#33738)

This includes making sure that both the agent panel and Zed's edit
prediction have a consistent narrative when it comes to onboarding users
into the AI features, considering the possible different plans and
conditions (such as being signed in/out, account age, etc.)

Release Notes:

- N/A

---------

Co-authored-by: Bennet Bo Fenner <53836821+bennetbo@users.noreply.github.com>
Co-authored-by: Bennet Bo Fenner <bennetbo@gmx.de>

crates/title_bar/src/title_bar.rs

@@ -20,7 +20,7 @@ use crate::application_menu::{
 
 use auto_update::AutoUpdateStatus;
 use call::ActiveCall;
-use client::{Client, UserStore};
+use client::{Client, UserStore, zed_urls};
 use gpui::{
     Action, AnyElement, App, Context, Corner, Element, Entity, Focusable, InteractiveElement,
     IntoElement, MouseButton, ParentElement, Render, StatefulInteractiveElement, Styled,
@@ -656,8 +656,9 @@ impl TitleBar {
                         let user_login = user.github_login.clone();
 
                         let (plan_name, label_color, bg_color) = match plan {
-                            None => ("None", Color::Default, free_chip_bg),
-                            Some(proto::Plan::Free) => ("Free", Color::Default, free_chip_bg),
+                            None | Some(proto::Plan::Free) => {
+                                ("Free", Color::Default, free_chip_bg)
+                            }
                             Some(proto::Plan::ZedProTrial) => {
                                 ("Pro Trial", Color::Accent, pro_chip_bg)
                             }
@@ -680,7 +681,7 @@ impl TitleBar {
                                     .into_any_element()
                             },
                             move |_, cx| {
-                                cx.open_url("https://zed.dev/account");
+                                cx.open_url(&zed_urls::account_url(cx));
                             },
                         )
                         .separator()