feat: add animated gradient border to Connect Device buttons

Pure CSS conic-gradient animation with @property --border-angle,
dynamic accent color from traffic zone, light theme + reduced motion support.

src/components/dashboard/SubscriptionCardActive.tsx

@@ -10,6 +10,7 @@ import { useTheme } from '../../hooks/useTheme';
 import { getTrafficZone } from '../../utils/trafficZone';
 import { formatTraffic } from '../../utils/formatTraffic';
 import { getGlassColors } from '../../utils/glassTheme';
+import { HoverBorderGradient } from '../ui/hover-border-gradient';
 import type { Subscription } from '../../types';
 
 interface SubscriptionCardActiveProps {
@@ -196,15 +197,13 @@ export default function SubscriptionCardActive({
 
       {/* ─── Connect Device Button ─── */}
       {subscription.subscription_url && (
-        <button
+        <HoverBorderGradient
+          as="button"
+          accentColor={zone.mainHex}
           onClick={() => navigate('/connection')}
-          className="mb-2.5 flex w-full items-center gap-3.5 rounded-[14px] p-3.5 text-left transition-all duration-300"
+          className="mb-2.5 flex w-full items-center gap-3.5 rounded-[14px] p-3.5 text-left transition-shadow duration-300"
           data-onboarding="connect-devices"
-          style={{
-            fontFamily: 'inherit',
-            background: g.innerBg,
-            border: `1px solid ${g.innerBorder}`,
-          }}
+          style={{ fontFamily: 'inherit' }}
         >
           {/* Monitor icon */}
           <div
@@ -254,7 +253,7 @@ export default function SubscriptionCardActive({
               />
             ))}
           </div>
-        </button>
+        </HoverBorderGradient>
       )}
 
       {/* ─── Stats row: Tariff + Days Left ─── */}

src/components/ui/hover-border-gradient.tsx

@@ -1,30 +1,51 @@
 import React from 'react';
 import { cn } from '@/lib/utils';
 
+interface HoverBorderGradientProps extends React.HTMLAttributes<HTMLElement> {
+  /** Rendered HTML element. Default: 'div' */
+  as?: React.ElementType;
+  /** Hex color for the rotating gradient beam (e.g. '#00E5A0') */
+  accentColor?: string;
+  /** Full rotation duration in seconds. Default: 3 */
+  duration?: number;
+}
+
+/**
+ * Animated conic-gradient border that rotates around the element.
+ *
+ * Uses pure CSS `@property --border-angle` animation — no JS loops,
+ * GPU-friendly, works in Telegram Mini App WebView.
+ *
+ * Fallback: browsers without `@property` show a static gradient border.
+ */
 export function HoverBorderGradient({
   children,
-  containerClassName,
   className,
-  as: Tag = 'button',
+  as: Tag = 'div',
+  accentColor,
+  duration,
+  style,
   ...props
-}: React.PropsWithChildren<
-  {
-    as?: React.ElementType;
-    containerClassName?: string;
-    className?: string;
-  } & React.HTMLAttributes<HTMLElement>
->) {
+}: HoverBorderGradientProps) {
+  const cssVars: Record<string, string> = {};
+
+  if (accentColor) {
+    cssVars['--accent-color'] = accentColor;
+    // 30% opacity hex suffix for hover glow
+    cssVars['--accent-glow'] = accentColor + '4D';
+  }
+
+  if (duration !== undefined) {
+    cssVars['--border-duration'] = `${duration}s`;
+  }
+
   return (
     <Tag
-      className={cn(
-        'hover-border-gradient group flex items-center justify-center rounded-xl text-sm font-medium text-white',
-        containerClassName,
-      )}
+      className={cn('hover-border-gradient', className)}
+      style={{ ...cssVars, ...style } as React.CSSProperties}
       {...props}
     >
-      <span className={cn('relative z-10 flex items-center justify-center', className)}>
-        {children}
-      </span>
+      {children}
     </Tag>
   );
 }

src/pages/Subscription.tsx

@@ -10,6 +10,7 @@ import { getTrafficZone } from '../utils/trafficZone';
 import { formatTraffic } from '../utils/formatTraffic';
 import { getGlassColors } from '../utils/glassTheme';
 import { useTheme } from '../hooks/useTheme';
+import { HoverBorderGradient } from '../components/ui/hover-border-gradient';
 import type {
   PurchaseSelection,
   PeriodOption,
@@ -909,14 +910,12 @@ export default function Subscription() {
 
               {/* ─── Connect Device Button ─── */}
               {subscription.subscription_url && (
-                <button
+                <HoverBorderGradient
+                  as="button"
+                  accentColor={zone.mainHex}
                   onClick={() => navigate('/connection')}
-                  className="mb-5 flex w-full items-center gap-3.5 rounded-[14px] p-3.5 text-left transition-all duration-300"
-                  style={{
-                    background: g.innerBg,
-                    border: `1px solid ${g.innerBorder}`,
-                    fontFamily: 'inherit',
-                  }}
+                  className="mb-5 flex w-full items-center gap-3.5 rounded-[14px] p-3.5 text-left transition-shadow duration-300"
+                  style={{ fontFamily: 'inherit' }}
                 >
                   <div
                     className="flex h-9 w-9 flex-shrink-0 items-center justify-center rounded-[10px] transition-colors duration-500"
@@ -961,7 +960,7 @@ export default function Subscription() {
                       />
                     ))}
                   </div>
-                </button>
+                </HoverBorderGradient>
               )}
 
               {/* ─── Subscription URL ─── */}

src/styles/globals.css

@@ -10,10 +10,9 @@
 }
 
 .hover-border-gradient {
-  --_bg: rgb(var(--color-dark-900));
-  --_accent: rgb(var(--color-accent-400));
+  --_bg: var(--border-inner-bg, rgb(var(--color-dark-900)));
+  --_accent: var(--accent-color, rgb(var(--color-accent-400)));
   border: 1.5px solid transparent;
-  padding: 10px 16px;
   background:
     linear-gradient(var(--_bg), var(--_bg)) padding-box,
     conic-gradient(
@@ -24,12 +23,22 @@
         var(--_accent) 100%
       )
       border-box;
-  animation: border-rotate 3s linear infinite;
-  transition: box-shadow 0.3s ease;
+  animation: border-rotate var(--border-duration, 3s) linear infinite;
 }
 
-.hover-border-gradient:hover {
-  box-shadow: 0 0 16px rgba(var(--color-accent-400), 0.3);
+.hover-border-gradient:hover,
+.hover-border-gradient:active {
+  box-shadow: 0 0 20px var(--accent-glow, rgba(var(--color-accent-400), 0.25));
+}
+
+.light .hover-border-gradient {
+  --_bg: var(--border-inner-bg, rgb(var(--color-champagne-100)));
+}
+
+@media (prefers-reduced-motion: reduce) {
+  .hover-border-gradient {
+    animation-play-state: paused;
+  }
 }
 
 @keyframes border-rotate {