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>

__tests__/ui-features.test.ts

@@ -8,7 +8,7 @@ describe('UI Features Tests', () => {
     
     // Check for color input
     expect(adminContent).toContain('type="color"');
-    expect(adminContent).toContain('bojaHex');
+    expect(adminContent).toContain('boja_hex');
     expect(adminContent).toContain('Hex kod boje');
   });
 
@@ -17,8 +17,8 @@ describe('UI Features Tests', () => {
     const tableContent = readFileSync(filamentTablePath, 'utf-8');
     
     // Check for color display
-    expect(tableContent).toContain('ColorSwatch');
-    expect(tableContent).toContain('bojaHex');
+    expect(tableContent).toContain('backgroundColor: filament.boja_hex');
+    expect(tableContent).toContain('boja_hex');
   });
 
   it('should have number inputs for quantity fields', () => {
@@ -27,9 +27,9 @@ describe('UI Features Tests', () => {
     
     // Check for number inputs for quantities
     expect(adminContent).toMatch(/type="number"[\s\S]*?name="refill"/);
-    expect(adminContent).toMatch(/type="number"[\s\S]*?name="vakum"/);
+    expect(adminContent).toMatch(/type="number"[\s\S]*?name="spulna"/);
     expect(adminContent).toContain('Refill');
-    expect(adminContent).toContain('Vakuum');
+    expect(adminContent).toContain('Spulna');
     expect(adminContent).toContain('Ukupna količina');
   });