Update Agent panel to work with CloudUserStore (#35436)

This PR updates the Agent panel to work with the `CloudUserStore`
instead of the `UserStore`, reducing its reliance on being connected to
Collab to function.

Release Notes:

- N/A

---------

Co-authored-by: Richard Feldman <oss@rtfeldman.com>

crates/language_models/src/language_models.rs

@@ -1,7 +1,7 @@
 use std::sync::Arc;
 
 use ::settings::{Settings, SettingsStore};
-use client::{Client, UserStore};
+use client::{Client, CloudUserStore, UserStore};
 use collections::HashSet;
 use gpui::{App, Context, Entity};
 use language_model::{LanguageModelProviderId, LanguageModelRegistry};
@@ -26,11 +26,22 @@ use crate::provider::vercel::VercelLanguageModelProvider;
 use crate::provider::x_ai::XAiLanguageModelProvider;
 pub use crate::settings::*;
 
-pub fn init(user_store: Entity<UserStore>, client: Arc<Client>, cx: &mut App) {
+pub fn init(
+    user_store: Entity<UserStore>,
+    cloud_user_store: Entity<CloudUserStore>,
+    client: Arc<Client>,
+    cx: &mut App,
+) {
     crate::settings::init_settings(cx);
     let registry = LanguageModelRegistry::global(cx);
     registry.update(cx, |registry, cx| {
-        register_language_model_providers(registry, user_store, client.clone(), cx);
+        register_language_model_providers(
+            registry,
+            user_store,
+            cloud_user_store,
+            client.clone(),
+            cx,
+        );
     });
 
     let mut openai_compatible_providers = AllLanguageModelSettings::get_global(cx)
@@ -100,11 +111,17 @@ fn register_openai_compatible_providers(
 fn register_language_model_providers(
     registry: &mut LanguageModelRegistry,
     user_store: Entity<UserStore>,
+    cloud_user_store: Entity<CloudUserStore>,
     client: Arc<Client>,
     cx: &mut Context<LanguageModelRegistry>,
 ) {
     registry.register_provider(
-        CloudLanguageModelProvider::new(user_store.clone(), client.clone(), cx),
+        CloudLanguageModelProvider::new(
+            user_store.clone(),
+            cloud_user_store.clone(),
+            client.clone(),
+            cx,
+        ),
         cx,
     );