Update src/api/providers/mistral.ts

Co-authored-by: ellipsis-dev[bot] <65095814+ellipsis-dev[bot]@users.noreply.github.com>

Author: d-oit

src/api/providers/mistral.ts

@@ -205,7 +205,7 @@ export class MistralHandler implements ApiHandler {
 		} catch (error) {
 			if (error instanceof Error) {
 				this.logDebug(`Completion error: ${error.message}`)
-				throw new Error(`Mistral completion error: ${error.message}`)
+				throw new Error(`Mistral completion error: ${error.message}`, { cause: error })
 			}
 			throw error
 		}