feat: Replace text logo with puma icon

Changes:
- Added pounce-logo.png to /public
- Updated Header.tsx: Replaced text logo with Image component
- Updated Footer.tsx: Replaced text logo with Image component
- Updated login/page.tsx: Replaced text logo with Image component
- Updated register/page.tsx: Replaced text logo with Image component

Logo sizing:
- Header: 32px (mobile) / 36px (desktop)
- Footer: 40px
- Login/Register: 48px

All logos use Next.js Image component for optimization

frontend/src/app/login/page.tsx

@@ -3,22 +3,20 @@
 import { useState } from 'react'
 import { useRouter } from 'next/navigation'
 import Link from 'next/link'
+import Image from 'next/image'
 import { useStore } from '@/lib/store'
 import { Loader2, ArrowRight, Eye, EyeOff } from 'lucide-react'
 
-// Logo Component - Text with accent dot
+// Logo Component - Puma Image
 function Logo() {
   return (
-    <div className="relative inline-flex items-baseline">
-      {/* Accent dot - top left */}
-      <span className="absolute top-1 -left-3.5 flex items-center justify-center">
-        <span className="w-2.5 h-2.5 rounded-full bg-accent" />
-        <span className="absolute w-2.5 h-2.5 rounded-full bg-accent animate-ping opacity-30" />
-      </span>
-      <span className="text-2xl font-bold tracking-tight text-foreground">
-        pounce
-      </span>
-    </div>
+    <Image
+      src="/pounce-logo.png"
+      alt="pounce"
+      width={48}
+      height={48}
+      className="w-12 h-12"
+    />
   )
 }
 

frontend/src/app/register/page.tsx

@@ -3,22 +3,20 @@
 import { useState } from 'react'
 import { useRouter } from 'next/navigation'
 import Link from 'next/link'
+import Image from 'next/image'
 import { useStore } from '@/lib/store'
 import { Loader2, ArrowRight, Check, Eye, EyeOff } from 'lucide-react'
 
-// Logo Component - Text with accent dot
+// Logo Component - Puma Image
 function Logo() {
   return (
-    <div className="relative inline-flex items-baseline">
-      {/* Accent dot - top left */}
-      <span className="absolute top-1 -left-3.5 flex items-center justify-center">
-        <span className="w-2.5 h-2.5 rounded-full bg-accent" />
-        <span className="absolute w-2.5 h-2.5 rounded-full bg-accent animate-ping opacity-30" />
-      </span>
-      <span className="text-2xl font-bold tracking-tight text-foreground">
-        pounce
-      </span>
-    </div>
+    <Image
+      src="/pounce-logo.png"
+      alt="pounce"
+      width={48}
+      height={48}
+      className="w-12 h-12"
+    />
   )
 }
 

frontend/src/components/Footer.tsx

@@ -1,4 +1,5 @@
 import Link from 'next/link'
+import Image from 'next/image'
 import { Github, Twitter, Mail } from 'lucide-react'
 
 export function Footer() {
@@ -8,14 +9,14 @@ export function Footer() {
         <div className="grid grid-cols-2 md:grid-cols-4 gap-8 mb-12">
           {/* Brand */}
           <div className="col-span-2 md:col-span-1">
-            <div className="relative inline-flex items-baseline mb-4">
-              <span className="absolute top-1 -left-3.5 flex items-center justify-center">
-                <span className="w-2.5 h-2.5 rounded-full bg-accent" />
-                <span className="absolute w-2.5 h-2.5 rounded-full bg-accent animate-ping opacity-30" />
-              </span>
-              <span className="text-xl font-bold tracking-tight text-foreground">
-                pounce
-              </span>
+            <div className="mb-4">
+              <Image
+                src="/pounce-logo.png"
+                alt="pounce"
+                width={40}
+                height={40}
+                className="w-10 h-10"
+              />
             </div>
             <p className="text-body-sm text-foreground-muted mb-4 max-w-xs">
               Professional domain intelligence. Monitor availability, track prices, and secure your domains.

frontend/src/components/Header.tsx

@@ -1,22 +1,23 @@
 'use client'
 
 import Link from 'next/link'
+import Image from 'next/image'
 import { useStore } from '@/lib/store'
 import { LogOut, LayoutDashboard, Menu, X } from 'lucide-react'
 import { useState } from 'react'
 
-// Logo Component - Text with accent dot
+// Logo Component - Puma Image
 function Logo() {
   return (
-    <div className="relative inline-flex items-baseline">
-      {/* Accent dot - top left */}
-      <span className="absolute top-1 -left-3 sm:-left-3.5 flex items-center justify-center">
-        <span className="w-2 h-2 sm:w-2.5 sm:h-2.5 rounded-full bg-accent" />
-        <span className="absolute w-2 h-2 sm:w-2.5 sm:h-2.5 rounded-full bg-accent animate-ping opacity-30" />
-      </span>
-      <span className="text-xl sm:text-2xl font-bold tracking-tight text-foreground">
-        pounce
-      </span>
+    <div className="relative flex items-center">
+      <Image
+        src="/pounce-logo.png"
+        alt="pounce"
+        width={36}
+        height={36}
+        className="w-8 h-8 sm:w-9 sm:h-9 object-contain"
+        priority
+      />
     </div>
   )
 }