feat: add HoverBorderGradient effect to key action buttons

Apply animated gradient border effect (Aceternity UI) to:
- Dashboard "Connect Devices" button
- Dashboard "Activate Trial" buttons (free and paid variants)
- Subscription page "Connect Devices" button

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

@@ -0,0 +1,93 @@
+'use client';
+import React, { useState, useEffect } from 'react';
+import { motion } from 'framer-motion';
+import { cn } from '@/lib/utils';
+
+type Direction = 'TOP' | 'LEFT' | 'BOTTOM' | 'RIGHT';
+
+export function HoverBorderGradient({
+  children,
+  containerClassName,
+  className,
+  as: Tag = 'button',
+  duration = 1,
+  clockwise = true,
+  ...props
+}: React.PropsWithChildren<
+  {
+    as?: React.ElementType;
+    containerClassName?: string;
+    className?: string;
+    duration?: number;
+    clockwise?: boolean;
+  } & React.HTMLAttributes<HTMLElement>
+>) {
+  const [hovered, setHovered] = useState<boolean>(false);
+  const [direction, setDirection] = useState<Direction>('TOP');
+
+  const rotateDirection = (currentDirection: Direction): Direction => {
+    const directions: Direction[] = ['TOP', 'LEFT', 'BOTTOM', 'RIGHT'];
+    const currentIndex = directions.indexOf(currentDirection);
+    const nextIndex = clockwise
+      ? (currentIndex - 1 + directions.length) % directions.length
+      : (currentIndex + 1) % directions.length;
+    return directions[nextIndex];
+  };
+
+  const movingMap: Record<Direction, string> = {
+    TOP: 'radial-gradient(20.7% 50% at 50% 0%, hsl(0, 0%, 100%) 0%, rgba(255, 255, 255, 0) 100%)',
+    LEFT: 'radial-gradient(16.6% 43.1% at 0% 50%, hsl(0, 0%, 100%) 0%, rgba(255, 255, 255, 0) 100%)',
+    BOTTOM:
+      'radial-gradient(20.7% 50% at 50% 100%, hsl(0, 0%, 100%) 0%, rgba(255, 255, 255, 0) 100%)',
+    RIGHT:
+      'radial-gradient(16.2% 41.2% at 100% 50%, hsl(0, 0%, 100%) 0%, rgba(255, 255, 255, 0) 100%)',
+  };
+
+  const highlight =
+    'radial-gradient(75% 181.16% at 50% 50%, #3275F8 0%, rgba(255, 255, 255, 0) 100%)';
+
+  useEffect(() => {
+    if (!hovered) {
+      const interval = setInterval(() => {
+        setDirection((prevState) => rotateDirection(prevState));
+      }, duration * 1000);
+      return () => clearInterval(interval);
+    }
+  }, [hovered, duration]);
+
+  return (
+    <Tag
+      onMouseEnter={() => setHovered(true)}
+      onMouseLeave={() => setHovered(false)}
+      className={cn(
+        'relative flex content-center items-center justify-center overflow-visible rounded-xl border-none bg-black/20 p-px transition duration-500 hover:bg-black/10',
+        containerClassName,
+      )}
+      {...props}
+    >
+      <div
+        className={cn(
+          'z-10 w-auto rounded-[inherit] bg-dark-800 px-4 py-2.5 text-sm font-medium text-white',
+          className,
+        )}
+      >
+        {children}
+      </div>
+      <motion.div
+        className="absolute inset-0 z-0 flex-none overflow-hidden rounded-[inherit]"
+        style={{
+          filter: 'blur(2px)',
+          position: 'absolute',
+          width: '100%',
+          height: '100%',
+        }}
+        initial={{ background: movingMap[direction] }}
+        animate={{
+          background: hovered ? [movingMap[direction], highlight] : movingMap[direction],
+        }}
+        transition={{ ease: 'linear', duration: duration ?? 1 }}
+      />
+      <div className="absolute inset-[2px] z-[1] flex-none rounded-[10px] bg-dark-800" />
+    </Tag>
+  );
+}

src/pages/Dashboard.tsx

@@ -10,6 +10,7 @@ import { balanceApi } from '../api/balance';
 import { wheelApi } from '../api/wheel';
 import Onboarding, { useOnboarding } from '../components/Onboarding';
 import PromoOffersSection from '../components/PromoOffersSection';
+import { HoverBorderGradient } from '../components/ui/hover-border-gradient';
 import { useCurrency } from '../hooks/useCurrency';
 import { API } from '../config/constants';
 
@@ -411,13 +412,14 @@ export default function Dashboard() {
               {t('dashboard.viewSubscription')}
             </Link>
             {subscription.subscription_url && (
-              <button
+              <HoverBorderGradient
                 onClick={() => navigate('/connection')}
-                className="btn-secondary py-2.5 text-sm"
+                containerClassName="w-full"
+                className="flex w-full items-center justify-center py-2.5 text-sm"
                 data-onboarding="connect-devices"
               >
                 {t('subscription.getConfig')}
-              </button>
+              </HoverBorderGradient>
             )}
           </div>
         </div>
@@ -590,30 +592,30 @@ export default function Dashboard() {
 
               {trialInfo.requires_payment && trialInfo.price_kopeks > 0 ? (
                 (balanceData?.balance_kopeks || 0) >= trialInfo.price_kopeks ? (
-                  <button
+                  <HoverBorderGradient
                     onClick={() => activateTrialMutation.mutate()}
-                    disabled={activateTrialMutation.isPending}
+                    containerClassName={`w-full ${activateTrialMutation.isPending ? 'pointer-events-none opacity-50' : ''}`}
-                    className="btn-primary w-full"
+                    className="flex w-full items-center justify-center"
                   >
                     {activateTrialMutation.isPending
                       ? t('common.loading', 'Loading...')
                       : t('subscription.trial.payAndActivate', 'Pay from Balance & Activate')}
-                  </button>
+                  </HoverBorderGradient>
                 ) : (
                   <Link to="/balance" className="btn-primary block w-full text-center">
                     {t('subscription.trial.topUpToActivate', 'Top Up Balance')}
                   </Link>
                 )
               ) : (
-                <button
+                <HoverBorderGradient
                   onClick={() => activateTrialMutation.mutate()}
-                  disabled={activateTrialMutation.isPending}
+                  containerClassName={`w-full ${activateTrialMutation.isPending ? 'pointer-events-none opacity-50' : ''}`}
-                  className="btn-primary w-full"
+                  className="flex w-full items-center justify-center"
                 >
                   {activateTrialMutation.isPending
                     ? t('common.loading', 'Loading...')
                     : t('subscription.trial.activate', 'Activate Free Trial')}
-                </button>
+                </HoverBorderGradient>
               )}
             </div>
           </div>

src/pages/Subscription.tsx

@@ -5,6 +5,7 @@ import { useLocation, useNavigate } from 'react-router';
 import { AxiosError } from 'axios';
 import { subscriptionApi } from '../api/subscription';
 import { promoApi } from '../api/promo';
+import { HoverBorderGradient } from '../components/ui/hover-border-gradient';
 import type {
   PurchaseSelection,
   PeriodOption,
@@ -756,9 +757,10 @@ export default function Subscription() {
               </div>
 
               {/* Get Config Button */}
-              <button
+              <HoverBorderGradient
                 onClick={() => navigate('/connection')}
-                className="btn-primary mb-3 flex w-full items-center justify-center gap-2 py-3"
+                containerClassName="mb-3 w-full"
+                className="flex w-full items-center justify-center gap-2 py-3"
               >
                 <svg
                   className="h-5 w-5"
@@ -774,7 +776,7 @@ export default function Subscription() {
                   />
                 </svg>
                 {t('subscription.getConfig')}
-              </button>
+              </HoverBorderGradient>
 
               {/* Subscription URL - hidden when hide_subscription_link is true */}
               {!subscription.hide_subscription_link && (