refactor: rename openAiCusModelInfo to openAiCustomModelInfo for better clarity

- Rename openAiCusModelInfo to openAiCustomModelInfo across all files for better readability
- Update related variable names and references to maintain consistency
- Affects OpenAI provider, ClineProvider, WebviewMessage, API interfaces, and UI components

src/api/providers/openai.ts

@@ -108,7 +108,7 @@ export class OpenAiHandler implements ApiHandler, SingleCompletionHandler {
 	getModel(): { id: string; info: ModelInfo } {
 		return {
 			id: this.options.openAiModelId ?? "",
-			info: this.options.openAiCusModelInfo ?? openAiModelInfoSaneDefaults,
+			info: this.options.openAiCustomModelInfo ?? openAiModelInfoSaneDefaults,
 		}
 	}