fix: Increase logo sizes significantly

New sizes:
- Header: 48px (mobile) → 56px (desktop) [was 32-36px]
- Footer: 48px [was 40px]
- Login/Register: 64px [was 48px]

Logo is now much more prominent and visible

frontend/src/app/login/page.tsx

@@ -13,9 +13,9 @@ function Logo() {
     <Image
       src="/pounce-logo.png"
       alt="pounce"
-      width={48}
-      height={48}
-      className="w-12 h-12"
+      width={64}
+      height={64}
+      className="w-16 h-16"
     />
   )
 }

frontend/src/app/register/page.tsx

@@ -13,9 +13,9 @@ function Logo() {
     <Image
       src="/pounce-logo.png"
       alt="pounce"
-      width={48}
-      height={48}
-      className="w-12 h-12"
+      width={64}
+      height={64}
+      className="w-16 h-16"
     />
   )
 }

frontend/src/components/Footer.tsx

@@ -13,9 +13,9 @@ export function Footer() {
               <Image
                 src="/pounce-logo.png"
                 alt="pounce"
-                width={40}
-                height={40}
-                className="w-10 h-10"
+                width={48}
+                height={48}
+                className="w-12 h-12"
               />
             </div>
             <p className="text-body-sm text-foreground-muted mb-4 max-w-xs">

frontend/src/components/Header.tsx

@@ -13,9 +13,9 @@ function Logo() {
       <Image
         src="/pounce-logo.png"
         alt="pounce"
-        width={36}
-        height={36}
-        className="w-8 h-8 sm:w-9 sm:h-9 object-contain"
+        width={56}
+        height={56}
+        className="w-12 h-12 sm:w-14 sm:h-14 object-contain"
         priority
       />
     </div>