fix(ui): сохранить snapshot speed при неизвестном исходе записи

lib/speed-persistence-outcome.ts

@@ -0,0 +1,9 @@
+import { ApiClientError } from "@/shared/api/http-client"
+
+/** Preserve the last confirmed snapshot only for this operation's explicit unknown receipt. */
+export function isSpeedPersistenceUnknown(error: unknown, runId: string): boolean {
+  if (!(error instanceof ApiClientError) || error.status !== 502) return false
+  if (!error.payload || typeof error.payload !== "object") return false
+  const payload = error.payload as { outcome?: unknown; runId?: unknown }
+  return payload.outcome === "unknown" && payload.runId === runId
+}