assistant panel: Fix entering credentials not updating view (#15527)

Co-authored-by: Bennet <bennet@zed.dev>

Release Notes:

- N/A

Co-authored-by: Bennet <bennet@zed.dev>

crates/language_model/src/registry.rs

@@ -54,9 +54,7 @@ fn register_language_model_providers(
                 registry.register_provider(CloudLanguageModelProvider::new(client.clone(), cx), cx);
             } else {
                 registry.unregister_provider(
-                    &LanguageModelProviderId::from(
-                        crate::provider::cloud::PROVIDER_NAME.to_string(),
-                    ),
+                    &LanguageModelProviderId::from(crate::provider::cloud::PROVIDER_ID.to_string()),
                     cx,
                 );
             }
@@ -80,9 +78,12 @@ pub struct ActiveModel {
     model: Option<Arc<dyn LanguageModel>>,
 }
 
-pub struct ActiveModelChanged;
+pub enum Event {
+    ActiveModelChanged,
+    ProviderStateChanged,
+}
 
-impl EventEmitter<ActiveModelChanged> for LanguageModelRegistry {}
+impl EventEmitter<Event> for LanguageModelRegistry {}
 
 impl LanguageModelRegistry {
     pub fn global(cx: &AppContext) -> Model<Self> {
@@ -114,7 +115,10 @@ impl LanguageModelRegistry {
     ) {
         let name = provider.id();
 
-        if let Some(subscription) = provider.subscribe(cx) {
+        let subscription = provider.subscribe(cx, |_, cx| {
+            cx.emit(Event::ProviderStateChanged);
+        });
+        if let Some(subscription) = subscription {
             subscription.detach();
         }
 
@@ -187,7 +191,7 @@ impl LanguageModelRegistry {
             provider,
             model: None,
         });
-        cx.emit(ActiveModelChanged);
+        cx.emit(Event::ActiveModelChanged);
     }
 
     pub fn set_active_model(
@@ -202,13 +206,13 @@ impl LanguageModelRegistry {
                     provider,
                     model: Some(model),
                 });
-                cx.emit(ActiveModelChanged);
+                cx.emit(Event::ActiveModelChanged);
             } else {
                 log::warn!("Active model's provider not found in registry");
             }
         } else {
             self.active_model = None;
-            cx.emit(ActiveModelChanged);
+            cx.emit(Event::ActiveModelChanged);
         }
     }