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

lib/speed-persistence-outcome.test.ts

@@ -0,0 +1,19 @@
+import assert from "node:assert/strict"
+import { test } from "node:test"
+import { ApiClientError } from "../shared/api/http-client"
+import { isSpeedPersistenceUnknown } from "./speed-persistence-outcome"
+
+test("matching unknown persistence receipt preserves the confirmed snapshot", () => {
+  assert.equal(isSpeedPersistenceUnknown(new ApiClientError("unknown", 502, { outcome: "unknown", runId: "current" }), "current"), true)
+})
+
+test("other operations, malformed responses and ordinary failures cannot masquerade as unknown persistence", () => {
+  for (const error of [
+    Error("unknown"),
+    new ApiClientError("unknown", 502, { outcome: "unknown", runId: "other" }),
+    new ApiClientError("unknown", 502, { outcome: "unknown" }),
+    new ApiClientError("unknown", 502, { outcome: "failed", runId: "current" }),
+    new ApiClientError("forbidden", 403, { outcome: "unknown", runId: "current" }),
+    new ApiClientError("bad body", 502, null),
+  ]) assert.equal(isSpeedPersistenceUnknown(error, "current"), false)
+})

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
+}