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/client/src/client.rs

@@ -301,6 +301,13 @@ impl Status {
         matches!(self, Self::Connected { .. })
     }
 
+    pub fn is_signing_in(&self) -> bool {
+        matches!(
+            self,
+            Self::Authenticating | Self::Reauthenticating | Self::Connecting | Self::Reconnecting
+        )
+    }
+
     pub fn is_signed_out(&self) -> bool {
         matches!(self, Self::SignedOut | Self::UpgradeRequired)
     }

crates/client/src/user.rs

@@ -764,6 +764,16 @@ impl UserStore {
     }
 
     pub fn current_plan(&self) -> Option<proto::Plan> {
+        #[cfg(debug_assertions)]
+        if let Ok(plan) = std::env::var("ZED_SIMULATE_ZED_PRO_PLAN").as_ref() {
+            return match plan.as_str() {
+                "free" => Some(proto::Plan::Free),
+                "trial" => Some(proto::Plan::ZedProTrial),
+                "pro" => Some(proto::Plan::ZedPro),
+                _ => None,
+            };
+        }
+
         self.current_plan
     }
 

crates/client/src/zed_urls.rs

@@ -17,3 +17,8 @@ fn server_url(cx: &App) -> &str {
 pub fn account_url(cx: &App) -> String {
     format!("{server_url}/account", server_url = server_url(cx))
 }
+
+/// Returns the URL to the upgrade page on zed.dev.
+pub fn upgrade_to_zed_pro_url(cx: &App) -> String {
+    format!("{server_url}/account/upgrade", server_url = server_url(cx))
+}