fix(ui): проверять период статистики до запроса

app/(main)/statistics/page.tsx

@@ -33,6 +33,7 @@ import {
   isStatisticsSliceKind,
   STATISTICS_DIMS,
 } from "@/lib/statistics-dims"
+import { readStatisticsRange } from "@/lib/statistics-range"
 import { useDataSource } from "@/lib/data-source"
 import { fmtBps, formatBytes } from "@/lib/fmt-rate"
 import {
@@ -95,13 +96,6 @@ interface CubeSlices {
 
 const SLICE_KEYS = ["country", "service", "asn", "serverId", "userId", "iface"] as const
 
-function readRange(sp: URLSearchParams): DateRangeYmd {
-  const from = sp.get("from")
-  const to = sp.get("to")
-  if (from && to && from <= to) return { from, to }
-  return rangeForPreset("7d")
-}
-
 function readDim(sp: URLSearchParams): StatisticsSliceKind {
   const t = sp.get("dim") ?? sp.get("tab")
   return t && isStatisticsSliceKind(t) ? t : "users"
@@ -236,7 +230,7 @@ function StatisticsPageInner() {
   const { mode, backendUrl, prefsHydrated } = useDataSource()
   const isLive = mode === "live"
 
-  const range = useMemo(() => readRange(searchParams), [searchParams])
+  const { range, error: rangeError } = useMemo(() => readStatisticsRange(searchParams, rangeForPreset("7d")), [searchParams])
   const slices = useMemo(() => readSlices(searchParams), [searchParams])
   const dim = useMemo(() => readDim(searchParams), [searchParams])
   const view = useMemo(() => readView(searchParams), [searchParams])
@@ -245,19 +239,19 @@ function StatisticsPageInner() {
   const pivotCol = useMemo(() => readPivotDim(searchParams, "pivotCol", "service"), [searchParams])
 
   const [retry, setRetry] = useState(0)
-  const requestKey = JSON.stringify({ backendUrl, isLive, range, slices, view, pivotRow, pivotCol, planes, retry })
+  const requestKey = JSON.stringify({ backendUrl, isLive, range, slices, view, pivotRow, pivotCol, planes, retry, rangeError })
   const [result, setResult] = useState<{
     key: string; data: StatisticsDto; pivot: StatisticsPivotDto; error: string | null
   } | null>(null)
   const current = result?.key === requestKey ? result : null
-  const loading = isLive && current === null
-  const error = current?.error ?? null
+  const loading = isLive && !rangeError && current === null
+  const error = rangeError ?? current?.error ?? null
   const dataReady = isLive && current !== null && !error
   const pivot = dataReady ? current.pivot : EMPTY_PIVOT
 
   const replaceParams = useCallback(
     (patch: Record<string, string | undefined>) => {
-      const sp = new URLSearchParams(searchParams.toString())
+      const sp = new URLSearchParams(window.location.search)
       for (const [k, v] of Object.entries(patch)) {
         if (v) sp.set(k, v)
         else sp.delete(k)
@@ -291,7 +285,7 @@ function StatisticsPageInner() {
   )
 
   useEffect(() => {
-    if (!prefsHydrated || !isLive) return
+    if (!prefsHydrated || !isLive || rangeError) return
     let cancelled = false
     void (async () => {
       try {
@@ -317,7 +311,7 @@ function StatisticsPageInner() {
     return () => {
       cancelled = true
     }
-  }, [backendUrl, isLive, prefsHydrated, range, slices, view, pivotRow, pivotCol, planes, requestKey])
+  }, [backendUrl, isLive, prefsHydrated, range, slices, view, pivotRow, pivotCol, planes, requestKey, rangeError])
 
   const viewData = dataReady ? current.data : EMPTY
   const sliced = hasAnySlice(slices)
@@ -357,7 +351,7 @@ function StatisticsPageInner() {
     <div className="flex h-full flex-col">
       <PageHeader
         crumbs={[{ label: "Обзор", href: "/dashboard" }, { label: "Статистика" }]}
-        actions={<PeriodSelector range={range} onChange={setRange} />}
+        actions={rangeError ? <Button type="button" variant="outline" onClick={() => setRange(rangeForPreset("7d"))}>Выбрать последние 7 дней</Button> : <PeriodSelector range={range} onChange={setRange} />}
       />
 
       <div className="flex flex-1 flex-col gap-4 overflow-y-auto px-4 py-4 md:gap-6 md:px-6 md:py-5">
@@ -372,8 +366,8 @@ function StatisticsPageInner() {
 
         {error ? (
           <Alert variant="destructive" role="alert">
-            <AlertTitle>Ошибка загрузки</AlertTitle>
-            <AlertDescription>{error}<Button type="button" variant="outline" size="sm" onClick={() => setRetry(n => n + 1)}>Повторить загрузку</Button></AlertDescription>
+            <AlertTitle>{rangeError ? "Некорректный период" : "Ошибка загрузки"}</AlertTitle>
+            <AlertDescription>{error}{!rangeError && <Button type="button" variant="outline" size="sm" onClick={() => setRetry(n => n + 1)}>Повторить загрузку</Button>}</AlertDescription>
           </Alert>
         ) : null}
 
@@ -495,7 +489,7 @@ function StatisticsPageInner() {
             }}
           />
           {isLive && !dataReady ? (
-            <div role="status" className="p-6 text-sm text-muted-foreground">{loading ? "Загрузка статистики…" : "Статистика недоступна. Повторите загрузку."}</div>
+            <div role="status" className="p-6 text-sm text-muted-foreground">{loading ? "Загрузка статистики…" : rangeError ? "Выберите корректный период для загрузки статистики." : "Статистика недоступна. Повторите загрузку."}</div>
           ) : emptyCube ? (
             <EmptyState
               title="Нет данных куба"