Refactor error handling and improve code formatting in runners.go. Replace fmt.Errorf with errors.New for better error management. Clean up whitespace and enhance readability in various API response structures.

internal/api/runners.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"database/sql"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"io"
 	"log"
@@ -1790,7 +1791,7 @@ func (s *Server) assignTaskToRunner(runnerID int64, taskID int64) error {
 			types.TaskStatusPending, taskID,
 		)
 		s.logTaskEvent(taskID, nil, types.LogLevelError, errMsg, "")
-		return fmt.Errorf(errMsg)
+		return errors.New(errMsg)
 	}
 
 	// Note: Task is already assigned in database by the atomic update in distributeTasksToRunners