fix(grid): mask loading only on executing result run

apps/desktop/src/lib/sql/queryExecutionState.ts

@@ -8,6 +8,21 @@ export function canCancelQueryExecution(state: QueryExecutionStateLike): boolean
   return state.isExecuting && !!state.executionId && !state.isCancelling;
 }
 
+export interface QueryResultLoadingStateLike extends QueryExecutionStateLike {
+  activeResultRunId?: string;
+  /** The result run being updated; null means the execution will create a new run. */
+  executingResultRunId?: string | null;
+}
+
+export function isActiveResultLoading(state: QueryResultLoadingStateLike): boolean {
+  if (!state.isExecuting) return false;
+  if (!state.activeResultRunId) return true;
+  // Keep unscoped legacy callers conservative while all new executions set an
+  // explicit run id (or null when they are producing a new result run).
+  if (state.executingResultRunId === undefined) return true;
+  return state.executingResultRunId === state.activeResultRunId;
+}
+
 export function queryExecutionLabelKey(state: Pick<QueryExecutionStateLike, "isCancelling">): "common.loading" | "common.stopping" {
   return state.isCancelling ? "common.stopping" : "common.loading";
 }