refactor: Remove ripple effects and gradient from login page

- Remove animated ripple background effects
- Remove gradient background, use solid color (bg-dark-bg-darker)
- Remove text-shadow glow effect from logo
- Simplify brand showcase to clean, minimal design

src/ui/desktop/authentication/Auth.tsx

@@ -842,25 +842,13 @@ export function Auth({
       <div className="w-full h-full flex flex-col md:flex-row">
 
         {/* Left Side - Brand Showcase */}
-        <div className="hidden md:flex md:w-2/5 relative overflow-hidden items-center justify-center"
+        <div className="hidden md:flex md:w-2/5 bg-dark-bg-darker items-center justify-center">
-          style={{
-            background: 'linear-gradient(to bottom right, hsl(var(--background)), #0e0e10, #09090b)'
-          }}
-        >
-          {/* Animated Ripples Background */}
-          <div className="absolute inset-0 flex items-center justify-center">
-            <div className="absolute w-0 h-0 bg-primary/10 rounded-full animate-[ripple_4s_ease-out_infinite]" />
-            <div className="absolute w-0 h-0 bg-primary/7 rounded-full animate-[ripple_4s_ease-out_infinite_1s]" />
-            <div className="absolute w-0 h-0 bg-primary/5 rounded-full animate-[ripple_4s_ease-out_infinite_2s]" />
-          </div>
-
           {/* Logo and Branding */}
-          <div className="relative z-10 text-center px-8">
+          <div className="text-center px-8">
             <div
               className="text-7xl font-bold tracking-wider mb-4 text-foreground"
               style={{
-                fontFamily: 'ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace',
+                fontFamily: 'ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace'
-                textShadow: '0 0 30px hsl(var(--primary) / 0.3), 0 0 60px hsl(var(--primary) / 0.2)'
               }}
             >
               TERMIX
@@ -872,21 +860,6 @@ export function Auth({
               {t("auth.description") || "Secure, powerful, and intuitive SSH connection management"}
             </div>
           </div>
-
-          <style>{`
-            @keyframes ripple {
-              0% {
-                width: 0;
-                height: 0;
-                opacity: 1;
-              }
-              100% {
-                width: 150vmax;
-                height: 150vmax;
-                opacity: 0;
-              }
-            }
-          `}</style>
         </div>
 
         {/* Right Side - Auth Form */}