fix: remove duplicate back buttons, improve multi-subscription UX

- Remove custom back buttons from Subscription detail and SubscriptionPurchase
  pages — native Telegram mini-app back button already handles navigation
- SubscriptionListCard: distinct trial badge with star icon and amber styling,
  trial cards get amber border/background for visual differentiation
- SubscriptionPurchase: change "Купить тариф" to "Новый тариф" when adding
  a new tariff in multi-subscription mode
- Subscription detail: show tariff name as title in multi-tariff mode

src/components/subscription/SubscriptionListCard.tsx

@@ -19,15 +19,28 @@ function formatDate(iso: string | null, locale?: string): string {
 
 function StatusBadge({
   status,
+  isTrial,
   t,
 }: {
   status: string;
+  isTrial: boolean;
   t: (key: string, fallback: string) => string;
 }) {
   const isActive = status === 'active' || status === 'trial';
   const isLimited = status === 'limited';
   const isExpired = status === 'expired' || status === 'disabled';
 
+  if (isTrial) {
+    return (
+      <span className="inline-flex items-center gap-1 rounded-full border border-amber-400/25 bg-amber-400/10 px-2 py-0.5 text-[10px] font-semibold text-amber-400">
+        <svg className="h-2.5 w-2.5" viewBox="0 0 24 24" fill="currentColor">
+          <path d="M12 2L15.09 8.26L22 9.27L17 14.14L18.18 21.02L12 17.77L5.82 21.02L7 14.14L2 9.27L8.91 8.26L12 2Z" />
+        </svg>
+        {t('subscription.statusTrial', 'Тестовая')}
+      </span>
+    );
+  }
+
   const color = isActive
     ? 'bg-emerald-400/15 text-emerald-400 border-emerald-400/20'
     : isLimited
@@ -35,9 +48,7 @@ function StatusBadge({
       : 'bg-red-400/15 text-red-400 border-red-400/20';
 
   const label = isActive
-    ? status === 'trial'
-      ? t('subscription.statusTrial', 'Тестовая')
-      : t('subscription.statusActive', 'Активна')
+    ? t('subscription.statusActive', 'Активна')
     : isLimited
       ? t('subscription.statusLimited', 'Ограничена')
       : isExpired
@@ -70,6 +81,7 @@ export default function SubscriptionListCard({
     onClick();
   };
 
+  const isTrial = subscription.is_trial;
   const isActive = subscription.status === 'active' || subscription.status === 'trial';
   const isExpired = subscription.status === 'expired' || subscription.status === 'disabled';
   const trafficLimit = subscription.traffic_limit_gb;
@@ -83,18 +95,27 @@ export default function SubscriptionListCard({
   const trafficColor =
     trafficPercent >= 90 ? 'bg-red-400' : trafficPercent >= 70 ? 'bg-amber-400' : 'bg-emerald-400';
 
+  const borderColor = isTrial
+    ? 'rgba(251,191,36,0.2)'
+    : isExpired
+      ? 'rgba(255,59,92,0.15)'
+      : g.cardBorder;
+
+  const bgColor = isTrial
+    ? isDark
+      ? 'rgba(251,191,36,0.04)'
+      : 'rgba(251,191,36,0.03)'
+    : isExpired
+      ? isDark
+        ? 'rgba(255,59,92,0.04)'
+        : 'rgba(255,59,92,0.03)'
+      : g.cardBg;
+
   return (
     <button
       onClick={handleClick}
       className="w-full rounded-2xl border p-4 text-left transition-all duration-200 hover:scale-[1.01] active:scale-[0.99]"
-      style={{
-        background: isExpired
-          ? isDark
-            ? 'rgba(255,59,92,0.04)'
-            : 'rgba(255,59,92,0.03)'
-          : g.cardBg,
-        borderColor: isExpired ? 'rgba(255,59,92,0.15)' : g.cardBorder,
-      }}
+      style={{ background: bgColor, borderColor }}
     >
       {/* Header: tariff name + status badge + chevron */}
       <div className="flex items-center justify-between gap-2">
@@ -102,7 +123,7 @@ export default function SubscriptionListCard({
           <span className="truncate text-base font-semibold" style={{ color: g.text }}>
             {subscription.tariff_name || t('subscription.defaultName', 'Подписка')}
           </span>
-          <StatusBadge status={subscription.status} t={t} />
+          <StatusBadge status={subscription.status} isTrial={isTrial} t={t} />
         </div>
         <svg
           className="h-4 w-4 shrink-0 opacity-30"

src/pages/Subscription.tsx

@@ -479,34 +479,12 @@ export default function Subscription() {
 
   return (
     <div className="space-y-6">
-      {/* Multi-tariff: back navigation + tariff name */}
-      {isMultiTariff && subscriptionId ? (
-        <div>
-          <button
-            onClick={() => navigate('/subscriptions')}
-            className="mb-2 flex items-center gap-1.5 text-sm text-dark-50/50 transition-colors hover:text-dark-50/80"
-          >
-            <svg
-              width="16"
-              height="16"
-              viewBox="0 0 24 24"
-              fill="none"
-              stroke="currentColor"
-              strokeWidth="2"
-              strokeLinecap="round"
-              strokeLinejoin="round"
-            >
-              <path d="M15 18l-6-6 6-6" />
-            </svg>
-            {t('subscription.backToList', 'Мои подписки')}
-          </button>
+      {/* Page title — native Telegram back button handles navigation */}
       <h1 className="text-2xl font-bold text-dark-50 sm:text-3xl">
-            {subscription?.tariff_name || t('subscription.title')}
+        {isMultiTariff && subscription?.tariff_name
+          ? subscription.tariff_name
+          : t('subscription.title')}
       </h1>
-        </div>
-      ) : (
-        <h1 className="text-2xl font-bold text-dark-50 sm:text-3xl">{t('subscription.title')}</h1>
-      )}
 
       {/* Current Subscription */}
       {subscription ? (

src/pages/SubscriptionPurchase.tsx

@@ -383,34 +383,7 @@ export default function SubscriptionPurchase() {
   if (optionsError || (!purchaseOptions && !optionsLoading)) {
     return (
       <div className="space-y-6">
-        <div className="flex items-center gap-3">
-          <button
-            onClick={() => navigate('/subscription')}
-            aria-label="Back"
-            className="flex h-9 w-9 items-center justify-center rounded-xl transition-colors"
-            style={{
-              background: g.innerBg,
-              border: `1px solid ${g.innerBorder}`,
-            }}
-          >
-            <svg
-              width="18"
-              height="18"
-              viewBox="0 0 24 24"
-              fill="none"
-              stroke="currentColor"
-              strokeWidth="2"
-              strokeLinecap="round"
-              strokeLinejoin="round"
-              className="text-dark-50/60"
-            >
-              <path d="M19 12H5M12 19l-7-7 7-7" />
-            </svg>
-          </button>
-          <h1 className="text-2xl font-bold text-dark-50 sm:text-3xl">
-            {t('subscription.extend')}
-          </h1>
-        </div>
+        <h1 className="text-2xl font-bold text-dark-50 sm:text-3xl">{t('subscription.extend')}</h1>
         <div
           className="rounded-3xl p-6 text-center"
           style={{
@@ -434,41 +407,16 @@ export default function SubscriptionPurchase() {
 
   return (
     <div className="space-y-6">
-      {/* Header with back link */}
-      <div className="flex items-center gap-3">
-        <button
-          onClick={() => navigate('/subscriptions')}
-          aria-label="Back"
-          className="flex h-9 w-9 items-center justify-center rounded-xl transition-colors"
-          style={{
-            background: g.innerBg,
-            border: `1px solid ${g.innerBorder}`,
-          }}
-        >
-          <svg
-            width="18"
-            height="18"
-            viewBox="0 0 24 24"
-            fill="none"
-            stroke="currentColor"
-            strokeWidth="2"
-            strokeLinecap="round"
-            strokeLinejoin="round"
-            className="text-dark-50/60"
-          >
-            <path d="M19 12H5M12 19l-7-7 7-7" />
-          </svg>
-        </button>
+      {/* Header — native Telegram back button handles navigation */}
       <h1 className="text-2xl font-bold text-dark-50 sm:text-3xl">
         {isMultiTariff && !subscriptionId
-            ? t('subscription.buyTariff', 'Купить тариф')
+          ? t('subscription.newTariff', 'Новый тариф')
           : subscription?.is_daily && !subscription?.is_trial
             ? t('subscription.switchTariff.title')
             : subscription && !subscription.is_trial
               ? t('subscription.extend')
               : t('subscription.getSubscription')}
       </h1>
-      </div>
 
       {/* Tariffs Section */}
       {isTariffsMode && tariffs.length > 0 && (