fix(ui): различать ошибки и пустую историю WireGuard

tests/e2e/wireguard-links.spec.ts

@@ -468,3 +468,62 @@ test("WireGuard: восстановление требует подтвержд
   await expect(page.getByText("Версия применена на роутер", { exact: true })).toBeVisible()
   expect(attempts).toBe(2)
 })
+
+test("WireGuard: ошибка истории не становится пустым списком", async ({ page }) => {
+  await setup(page, "/wireguard?server=1")
+  let attempts = 0
+  await page.route("**/api/wireguard/revisions?**", route => {
+    attempts++
+    if (attempts === 1) return route.fulfill({ status: 403, json: { error: "История запрещена тест" } })
+    if (attempts === 2) return route.fulfill({ json: {} })
+    if (attempts === 3) return route.fulfill({ json: { revisions: [{ id: "wrong", serverId: "2", section: "wireguard", source: "apply", fingerprint: "fixture", createdAt: "2026-09-29T00:00:00Z", note: null, itemCount: 1 }] } })
+    return route.fulfill({ json: { revisions: [] } })
+  })
+  await page.getByRole("button", { name: "История", exact: true }).click()
+  const sheet = page.getByRole("dialog", { name: "История WireGuard" })
+  for (const message of ["История запрещена тест", "Некорректный ответ истории WireGuard", "Некорректный ответ истории WireGuard"]) {
+    await expect(sheet.getByRole("alert")).toContainText(message)
+    await expect(sheet.getByText("Истории пока нет", { exact: true })).toHaveCount(0)
+    await expect(sheet.getByRole("button", { name: "Откатить", exact: true })).toHaveCount(0)
+    await sheet.getByRole("button", { name: "Повторить загрузку" }).click()
+  }
+  await expect(sheet.getByText("Истории пока нет", { exact: true })).toBeVisible()
+  await expect(sheet.getByRole("alert")).toHaveCount(0)
+  expect(attempts).toBe(4)
+})
+
+for (const oldFails of [false, true]) {
+  test("WireGuard: закрытая история не меняет новый запрос " + oldFails, async ({ page }) => {
+    await setup(page, "/wireguard?server=1")
+    let releaseOld: (() => void) | undefined
+    let releaseNew: (() => void) | undefined
+    const oldGate = new Promise<void>(resolve => { releaseOld = resolve })
+    const newGate = new Promise<void>(resolve => { releaseNew = resolve })
+    let attempts = 0
+    await page.route("**/api/wireguard/revisions?**", async route => {
+      const current = ++attempts
+      await (current === 1 ? oldGate : newGate)
+      if (current === 1 && oldFails) return route.fulfill({ status: 500, json: { error: "Старая ошибка истории" } })
+      return route.fulfill({ json: { revisions: current === 1 ? [] : [{ id: "new", serverId: "1", section: "wireguard", source: "apply", fingerprint: "fixture", createdAt: "2026-09-29T00:00:00Z", note: null, itemCount: 9 }] } })
+    })
+    const open = page.getByRole("button", { name: "История", exact: true })
+    const sheet = page.getByRole("dialog", { name: "История WireGuard" })
+    await open.click()
+    await expect.poll(() => attempts).toBe(1)
+    await expect(sheet.getByRole("status")).toContainText("Загрузка истории")
+    await page.keyboard.press("Escape")
+    await expect(sheet).toHaveCount(0)
+    await open.click()
+    await expect.poll(() => attempts).toBe(2)
+    const response = page.waitForResponse(r => r.url().includes("/api/wireguard/revisions?"))
+    releaseOld!()
+    await (await response).finished()
+    await page.waitForTimeout(150)
+    await expect(sheet.getByRole("status")).toContainText("Загрузка истории")
+    await expect(sheet.getByRole("alert")).toHaveCount(0)
+    releaseNew!()
+    await expect(sheet).toContainText("9 интерфейсов")
+    await expect(sheet.getByRole("status")).toHaveCount(0)
+    await expect(sheet.getByRole("button", { name: "Откатить", exact: true })).toBeVisible()
+  })
+}