copilot: Fix missing sign-out button when Zed is the edit prediction provider (#26340)

Closes #25884

Added a sign-out button for Copilot in Assistant settings, allowing
sign-out even when copilot is disabled.

<img width="500" alt="image"
src="https://github.com/user-attachments/assets/43fc97ad-f73c-49e1-a7b6-a3910434d661"
/>



Release Notes:

- Added a sign-out button for Copilot in Assistant settings.

crates/copilot/src/copilot.rs

@@ -623,16 +623,21 @@ impl Copilot {
 
     pub fn sign_out(&mut self, cx: &mut Context<Self>) -> Task<Result<()>> {
         self.update_sign_in_status(request::SignInStatus::NotSignedIn, cx);
-        if let CopilotServer::Running(RunningCopilotServer { lsp: server, .. }) = &self.server {
-            let server = server.clone();
-            cx.background_spawn(async move {
-                server
-                    .request::<request::SignOut>(request::SignOutParams {})
-                    .await?;
+        match &self.server {
+            CopilotServer::Running(RunningCopilotServer { lsp: server, .. }) => {
+                let server = server.clone();
+                cx.background_spawn(async move {
+                    server
+                        .request::<request::SignOut>(request::SignOutParams {})
+                        .await?;
+                    anyhow::Ok(())
+                })
+            }
+            CopilotServer::Disabled => cx.background_spawn(async move {
+                clear_copilot_config_dir().await;
                 anyhow::Ok(())
-            })
-        } else {
-            Task::ready(Err(anyhow!("copilot hasn't started yet")))
+            }),
+            _ => Task::ready(Err(anyhow!("copilot hasn't started yet"))),
         }
     }
 
@@ -1016,6 +1021,10 @@ async fn clear_copilot_dir() {
     remove_matching(paths::copilot_dir(), |_| true).await
 }
 
+async fn clear_copilot_config_dir() {
+    remove_matching(copilot_chat::copilot_chat_config_dir(), |_| true).await
+}
+
 async fn get_copilot_lsp(http: Arc<dyn HttpClient>) -> anyhow::Result<PathBuf> {
     const SERVER_PATH: &str = "dist/language-server.js";
 

crates/copilot/src/copilot_chat.rs

@@ -213,7 +213,7 @@ pub fn init(fs: Arc<dyn Fs>, client: Arc<dyn HttpClient>, cx: &mut App) {
     cx.set_global(GlobalCopilotChat(copilot_chat));
 }
 
-fn copilot_chat_config_dir() -> &'static PathBuf {
+pub fn copilot_chat_config_dir() -> &'static PathBuf {
     static COPILOT_CHAT_CONFIG_DIR: OnceLock<PathBuf> = OnceLock::new();
 
     COPILOT_CHAT_CONFIG_DIR.get_or_init(|| {