feat: add API connection state management and update status display

src/app/runtime/actions/mod.rs

@@ -295,6 +295,7 @@ pub fn apply_action(state: &mut AppStateRest, action: Action) {
                 match event {
                     TurnEvent::AssistantMessage(msg) => {
                         state.misc.thinking = false;
+                        state.misc.api_connected = true;
                         let display_content = msg.content.clone().unwrap_or_default();
                         if !display_content.is_empty() {
                             state.push_transcript(ChatMessageDisplay::new(Role::Assistant, display_content));
@@ -366,6 +367,7 @@ pub fn apply_action(state: &mut AppStateRest, action: Action) {
                     }
                     TurnEvent::StreamStart => {
                         state.misc.thinking = false;
+                        state.misc.api_connected = true;
                         state.push_transcript(ChatMessageDisplay::new(Role::Assistant, String::new()));
                     }
                     TurnEvent::StreamToken(delta) => {
@@ -390,6 +392,7 @@ pub fn apply_action(state: &mut AppStateRest, action: Action) {
                         }
                     }
                     TurnEvent::Error(msg) => {
+                        state.misc.api_connected = false;
                         let long_toast = Toast {
                             kind: ToastKind::Error,
                             message: msg.clone(),
@@ -468,6 +471,9 @@ fn spawn_turn(state: &AppStateRest) {
                 .unwrap_or_default();
         }
     }
+    if api_key.is_empty() {
+        api_key = crate::service::provider::DEFAULT_API_KEY.to_string();
+    }
     let (temperature, max_tokens) = crate::app::mode::effort::generation_params(
         state.misc.effort_level,
         state.settings.max_tokens,