Signin: use correct white logo PNG, fix company name, center Welcome back, remove subtitle

ondeck/src/app/auth/signin/page.tsx

@@ -9,11 +9,10 @@ export default function SignInPage() {
            style={{ background: 'linear-gradient(160deg, #0F513F 0%, #15745a 60%, #1FA883 100%)' }}>
         <div>
           <Image
-            src="/seubert-logo.webp"
+            src="/seubert-logo.png"
             alt="Seubert"
-            width={180}
-            height={56}
-            className="brightness-0 invert"
+            width={220}
+            height={68}
             priority
           />
         </div>
@@ -26,7 +25,7 @@ export default function SignInPage() {
           </p>
         </div>
         <p className="text-white/40 text-sm">
-          © {new Date().getFullYear()} Seubert Enterprises, Inc.
+          © {new Date().getFullYear()} Seubert and Associates
         </p>
       </div>
 
@@ -34,19 +33,18 @@ export default function SignInPage() {
       <div className="flex-1 flex flex-col items-center justify-center px-6 py-12 bg-white">
         <div className="w-full max-w-sm">
           {/* Mobile logo */}
-          <div className="flex justify-center mb-8 lg:hidden">
+          <div className="flex justify-center mb-8 lg:hidden rounded-lg py-5 px-6" style={{ backgroundColor: '#0F513F' }}>
             <Image
-              src="/seubert-logo.webp"
+              src="/seubert-logo.png"
               alt="Seubert"
-              width={150}
-              height={48}
+              width={180}
+              height={56}
               priority
             />
           </div>
 
-          <div className="mb-8">
+          <div className="mb-8 text-center">
             <h1 className="text-2xl font-bold text-gray-900">Welcome back</h1>
-            <p className="text-gray-500 mt-1 text-sm">Sign in to your Horizon account</p>
           </div>
 
           <SignInForm />