Remove refresh icon and fix Safari/WebKit runtime errors

- Removed manual refresh button from frontend (kept auto-refresh functionality)
- Fixed WebKit 'object cannot be found' error by replacing absolute positioning with flexbox
- Added lazy loading to images to prevent preload warnings
- Cleaned up unused imports and variables:
  - Removed unused useRef import
  - Removed unused colors state variable and colorService
  - Removed unused ColorSwatch import from FilamentTableV2
  - Removed unused getModifierIcon function from MaterialBadge
- Updated tests to match current implementation
- Improved layout stability for better cross-browser compatibility
- Removed temporary migration scripts

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

app/upadaj/page.tsx

@@ -41,8 +41,13 @@ export default function AdminLogin() {
   return (
     <div className="min-h-screen flex items-center justify-center bg-gray-50 dark:bg-gray-900 py-12 px-4 sm:px-6 lg:px-8">
       <div className="max-w-md w-full space-y-8">
-        <div>
-          <h2 className="mt-6 text-center text-3xl font-extrabold text-gray-900 dark:text-white">
+        <div className="flex flex-col items-center">
+          <img 
+            src="/logo.png" 
+            alt="Filamenteka" 
+            className="h-40 w-auto mb-6 drop-shadow-lg"
+          />
+          <h2 className="text-center text-3xl font-extrabold text-gray-900 dark:text-white">
             Admin Prijava
           </h2>
           <p className="mt-2 text-center text-sm text-gray-600 dark:text-gray-400">