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/language_model_selector.rs

@@ -104,7 +104,7 @@ impl LanguageModelPickerDelegate {
                 window,
                 |picker, _, event, window, cx| {
                     match event {
-                        language_model::Event::ProviderStateChanged
+                        language_model::Event::ProviderStateChanged(_)
                         | language_model::Event::AddedProvider(_)
                         | language_model::Event::RemovedProvider(_) => {
                             let query = picker.query(cx);