Handle auth for claude (#36442)

We'll now use the anthropic provider to get credentials for `claude` and
embed its configuration view in the panel when they are not present.

Release Notes:

- N/A

crates/agent_ui/src/agent_ui.rs

@@ -320,7 +320,7 @@ fn init_language_model_settings(cx: &mut App) {
     cx.subscribe(
         &LanguageModelRegistry::global(cx),
         |_, event: &language_model::Event, cx| match event {
-            language_model::Event::ProviderStateChanged
+            language_model::Event::ProviderStateChanged(_)
             | language_model::Event::AddedProvider(_)
             | language_model::Event::RemovedProvider(_) => {
                 update_active_language_model_from_settings(cx);