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 && (

app/upadaj/customers/page.tsx

@@ -25,6 +25,10 @@ export default function CustomersManagement() {
   const [saving, setSaving] = useState(false);
   const [darkMode, setDarkMode] = useState(false);
   const [mounted, setMounted] = useState(false);
+  const [showAddModal, setShowAddModal] = useState(false);
+  const [addForm, setAddForm] = useState({ name: '', phone: '', city: '', notes: '' });
+  const [addError, setAddError] = useState('');
+  const [addSaving, setAddSaving] = useState(false);
 
   // Initialize dark mode
   useEffect(() => {
@@ -139,6 +143,35 @@ export default function CustomersManagement() {
     }
   };
 
+  const handleAddCustomer = async () => {
+    if (!addForm.name.trim()) {
+      setAddError('Ime je obavezno');
+      return;
+    }
+    setAddSaving(true);
+    setAddError('');
+    try {
+      await customerService.create({
+        name: addForm.name.trim(),
+        phone: addForm.phone.trim() || undefined,
+        city: addForm.city.trim() || undefined,
+        notes: addForm.notes.trim() || undefined,
+      });
+      setShowAddModal(false);
+      setAddForm({ name: '', phone: '', city: '', notes: '' });
+      await fetchCustomers();
+    } catch (err: unknown) {
+      const error = err as { response?: { data?: { code?: string } } };
+      if (error.response?.data?.code === '23505') {
+        setAddError('Kupac sa ovim brojem telefona vec postoji');
+      } else {
+        setAddError('Greska pri dodavanju kupca');
+      }
+    } finally {
+      setAddSaving(false);
+    }
+  };
+
   const handleLogout = () => {
     localStorage.removeItem('authToken');
     localStorage.removeItem('tokenExpiry');
@@ -230,8 +263,8 @@ export default function CustomersManagement() {
               </div>
             )}
 
-            {/* Search bar */}
-            <div className="mb-6">
+            {/* Search bar + Add button */}
+            <div className="mb-6 flex items-center gap-4">
               <input
                 type="text"
                 placeholder="Pretrazi kupce..."
@@ -239,6 +272,12 @@ export default function CustomersManagement() {
                 onChange={(e) => setSearchTerm(e.target.value)}
                 className="w-full max-w-md px-4 py-2 border border-gray-300 dark:border-gray-600 rounded-lg bg-white dark:bg-gray-700 text-gray-900 dark:text-white placeholder-gray-400 dark:placeholder-gray-500 focus:ring-2 focus:ring-blue-500 focus:border-transparent"
               />
+              <button
+                onClick={() => setShowAddModal(true)}
+                className="px-4 py-2 bg-green-500 text-white rounded-lg hover:bg-green-600 whitespace-nowrap font-medium"
+              >
+                + Dodaj kupca
+              </button>
             </div>
 
             {/* Customer count */}
@@ -488,6 +527,108 @@ export default function CustomersManagement() {
           </main>
         </div>
       </div>
+
+      {/* Add Customer Modal */}
+      {showAddModal && (
+        <div
+          className="fixed inset-0 bg-black/50 flex items-center justify-center z-50"
+          onClick={() => setShowAddModal(false)}
+        >
+          <div
+            className="bg-white dark:bg-gray-800 rounded-lg shadow-xl w-full max-w-md mx-4 p-6"
+            onClick={(e) => e.stopPropagation()}
+          >
+            <div className="flex justify-between items-center mb-4">
+              <h2 className="text-xl font-bold text-gray-900 dark:text-white">
+                Dodaj kupca
+              </h2>
+              <button
+                onClick={() => setShowAddModal(false)}
+                className="text-gray-400 hover:text-gray-600 dark:hover:text-gray-300 text-2xl leading-none"
+              >
+                &times;
+              </button>
+            </div>
+
+            {addError && (
+              <div className="mb-4 p-3 bg-red-50 dark:bg-red-900/20 text-red-800 dark:text-red-400 rounded text-sm">
+                {addError}
+              </div>
+            )}
+
+            <div className="space-y-4">
+              <div>
+                <label className="block text-sm font-medium text-gray-700 dark:text-gray-300 mb-1">
+                  Ime *
+                </label>
+                <input
+                  type="text"
+                  value={addForm.name}
+                  onChange={(e) => setAddForm({ ...addForm, name: e.target.value })}
+                  className="w-full px-3 py-2 border border-gray-300 dark:border-gray-600 rounded-lg bg-white dark:bg-gray-700 text-gray-900 dark:text-white focus:ring-2 focus:ring-green-500 focus:border-transparent"
+                  placeholder="Ime i prezime"
+                  autoFocus
+                />
+              </div>
+
+              <div>
+                <label className="block text-sm font-medium text-gray-700 dark:text-gray-300 mb-1">
+                  Telefon
+                </label>
+                <input
+                  type="text"
+                  value={addForm.phone}
+                  onChange={(e) => setAddForm({ ...addForm, phone: e.target.value })}
+                  className="w-full px-3 py-2 border border-gray-300 dark:border-gray-600 rounded-lg bg-white dark:bg-gray-700 text-gray-900 dark:text-white focus:ring-2 focus:ring-green-500 focus:border-transparent"
+                  placeholder="Broj telefona"
+                />
+              </div>
+
+              <div>
+                <label className="block text-sm font-medium text-gray-700 dark:text-gray-300 mb-1">
+                  Grad
+                </label>
+                <input
+                  type="text"
+                  value={addForm.city}
+                  onChange={(e) => setAddForm({ ...addForm, city: e.target.value })}
+                  className="w-full px-3 py-2 border border-gray-300 dark:border-gray-600 rounded-lg bg-white dark:bg-gray-700 text-gray-900 dark:text-white focus:ring-2 focus:ring-green-500 focus:border-transparent"
+                  placeholder="Grad"
+                />
+              </div>
+
+              <div>
+                <label className="block text-sm font-medium text-gray-700 dark:text-gray-300 mb-1">
+                  Napomena
+                </label>
+                <textarea
+                  value={addForm.notes}
+                  onChange={(e) => setAddForm({ ...addForm, notes: e.target.value })}
+                  rows={3}
+                  className="w-full px-3 py-2 border border-gray-300 dark:border-gray-600 rounded-lg bg-white dark:bg-gray-700 text-gray-900 dark:text-white focus:ring-2 focus:ring-green-500 focus:border-transparent"
+                  placeholder="npr. stampa figurice, obicno crna..."
+                />
+              </div>
+            </div>
+
+            <div className="flex justify-end gap-3 mt-6">
+              <button
+                onClick={() => setShowAddModal(false)}
+                className="px-4 py-2 bg-gray-200 dark:bg-gray-700 text-gray-700 dark:text-gray-300 rounded-lg hover:bg-gray-300 dark:hover:bg-gray-600"
+              >
+                Otkazi
+              </button>
+              <button
+                onClick={handleAddCustomer}
+                disabled={addSaving}
+                className="px-4 py-2 bg-green-500 text-white rounded-lg hover:bg-green-600 disabled:opacity-50 font-medium"
+              >
+                {addSaving ? 'Cuvanje...' : 'Dodaj'}
+              </button>
+            </div>
+          </div>
+        </div>
+      )}
     </div>
   );
 }