Add OpenAI/LiteLLM provider support with settings UI

- Add openai/ provider module with translator, client, convert, request/response translators
- Add shared provider/ types (ConversationMessage, MessageRole, ProviderConfig enum)
- Wire OpenAI-compatible provider dispatch alongside Bedrock in response_stream.rs
- Add ai.openai.* settings (enabled, base_url, api_key, model, models)
- Add OpenAI/LiteLLM settings page with model fetch, picker, and config UI
- Extend model menu items and llms.rs to surface LiteLLM models
- Update WARP.md with OpenAI provider architecture docs

crates/input_classifier/src/heuristic_classifier/mod.rs

@@ -55,7 +55,8 @@ impl InputClassifier for HeuristicClassifier {
             return InputType::Shell;
         }
 
-        let result = self.classify_input(input, context)
+        let result = self
+            .classify_input(input, context)
             .await
             .map(|result| result.to_input_type())
             .unwrap_or(context.current_input_type);