Add manual customer creation and fix color edit modal

- Add "Dodaj kupca" button and modal form to customers page
- Fix color edit modal dark mode styling and add backdrop blur

app/upadaj/colors/page.tsx

@@ -370,10 +370,24 @@ export default function ColorsManagement() {
       
       {/* Edit Modal */}
       {editingColor && (
-        <div className="fixed inset-0 bg-black bg-opacity-50 flex items-center justify-center z-50 p-4">
-          <div className="bg-white dark:bg-gray-800 rounded-lg shadow-xl max-w-md w-full max-h-[90vh] overflow-auto">
+        <div
+          className="fixed inset-0 bg-black/60 backdrop-blur-sm flex items-center justify-center z-50 p-4"
+          onClick={() => setEditingColor(null)}
+        >
+          <div
+            className="bg-white dark:bg-gray-800 rounded-xl shadow-2xl border border-gray-200 dark:border-gray-700 max-w-md w-full max-h-[90vh] overflow-auto"
+            onClick={(e) => e.stopPropagation()}
+          >
+            <div className="flex justify-between items-center p-6 pb-0">
+              <h3 className="text-xl font-bold text-gray-900 dark:text-white">Izmeni boju</h3>
+              <button
+                onClick={() => setEditingColor(null)}
+                className="text-gray-400 hover:text-gray-600 dark:hover:text-gray-300 text-2xl leading-none"
+              >
+                &times;
+              </button>
+            </div>
             <div className="p-6">
-              <h3 className="text-xl font-bold mb-4 text-gray-900 dark:text-white">Izmeni boju</h3>
               <ColorForm
                 color={editingColor}
                 onSave={(color) => {
@@ -477,7 +491,7 @@ function ColorForm({
               readOnly={isBambuLabColor}
               pattern="^#[0-9A-Fa-f]{6}$"
               placeholder="#000000"
-              className={`flex-1 px-3 py-2 border border-gray-300 dark:border-gray-600 rounded-md bg-white dark:bg-gray-700 text-gray-900 dark:text-gray-100 focus:outline-none focus:ring-2 focus:ring-blue-500 ${isBambuLabColor ? 'bg-gray-100 dark:bg-gray-900 cursor-not-allowed' : ''}`}
+              className={`flex-1 px-3 py-2 border border-gray-300 dark:border-gray-600 rounded-md text-gray-900 dark:text-gray-100 focus:outline-none focus:ring-2 focus:ring-blue-500 ${isBambuLabColor ? 'bg-gray-100 dark:bg-gray-900 cursor-not-allowed' : 'bg-white dark:bg-gray-700'}`}
             />
           </div>
           {isBambuLabColor && (