Avoid spawning external agent process when AI is disabled at startup (#39649)

Closes #39645 

Release Notes:

- Fixed external agent servers sometimes being spawned when Zed started
even when AI was disabled.

crates/agent_servers/src/acp.rs

@@ -82,7 +82,7 @@ impl AcpConnection {
         is_remote: bool,
         cx: &mut AsyncApp,
     ) -> Result<Self> {
-        let mut child = util::command::new_smol_command(command.path);
+        let mut child = util::command::new_smol_command(&command.path);
         child
             .args(command.args.iter().map(|arg| arg.as_str()))
             .envs(command.env.iter().flatten())
@@ -97,6 +97,11 @@ impl AcpConnection {
         let stdout = child.stdout.take().context("Failed to take stdout")?;
         let stdin = child.stdin.take().context("Failed to take stdin")?;
         let stderr = child.stderr.take().context("Failed to take stderr")?;
+        log::info!(
+            "Spawning external agent server: {:?}, {:?}",
+            command.path,
+            command.args
+        );
         log::trace!("Spawned (pid: {})", child.id());
 
         let sessions = Rc::new(RefCell::new(HashMap::default()));

crates/agent_ui/src/agent_panel.rs

@@ -48,8 +48,8 @@ use editor::{Anchor, AnchorRangeExt as _, Editor, EditorEvent, MultiBuffer};
 use fs::Fs;
 use gpui::{
     Action, AnyElement, App, AsyncWindowContext, Corner, DismissEvent, Entity, EventEmitter,
-    ExternalPaths, FocusHandle, Focusable, KeyContext, Pixels, Subscription, Task, UpdateGlobal,
-    WeakEntity, prelude::*,
+    ExternalPaths, FocusHandle, Focusable, KeyContext, Pixels, ReadGlobal as _, Subscription, Task,
+    UpdateGlobal, WeakEntity, prelude::*,
 };
 use language::LanguageRegistry;
 use language_model::{ConfigurationError, LanguageModelRegistry};
@@ -519,6 +519,14 @@ impl AgentPanel {
                         cx,
                     )
                 });
+
+                if SettingsStore::global(cx)
+                    .get::<DisableAiSettings>(None)
+                    .disable_ai
+                {
+                    return panel;
+                }
+
                 panel.as_mut(cx).loading = true;
                 if let Some(serialized_panel) = serialized_panel {
                     panel.update(cx, |panel, cx| {