feat: color picker panel with 18 preset colors + native color input + hex field

frontend/src/components/contacts/ContactFolderTree.tsx

@@ -226,6 +226,7 @@ export function ContactFolderTree({
   const { t } = useTranslation();
   const [tagsOpen, setTagsOpen] = useState(true);
   const [dropdown, setDropdown] = useState<DropdownState | null>(null);
+  const [colorPicker, setColorPicker] = useState<{ folderId: string; color: string } | null>(null);
   const [dragOverFolderId, setDragOverFolderId] = useState<string | null>(null);
 
   const { data: folders, isLoading: foldersLoading } = useContactFolders();
@@ -273,9 +274,13 @@ export function ContactFolderTree({
   };
 
   const handleColor = (id: string) => {
-    const color = prompt('Farbe (Hex-Code, z.B. #ff0000):', '#3b82f6');
-    if (!color) return;
-    updateFolderMut.mutate({ id, data: { color } as any });
+    setColorPicker({ folderId: id, color: folderList.find((f) => f.id === id && (f as any).color) ? (folderList.find((f) => f.id === id) as any).color : '#3b82f6' });
+  };
+
+  const handleColorSelect = (color: string) => {
+    if (!colorPicker) return;
+    updateFolderMut.mutate({ id: colorPicker.folderId, data: { color } as any });
+    setColorPicker(null);
   };
 
   const handlePin = (id: string) => {
@@ -444,6 +449,48 @@ export function ContactFolderTree({
           onPin={handlePin}
         />
       )}
+
+      {colorPicker && createPortal(
+        <>
+          <div className="fixed inset-0 z-[9998]" onClick={() => setColorPicker(null)} />
+          <div className="fixed z-[9999] bg-white border border-secondary-200 rounded-lg shadow-lg p-3 min-w-[200px]" style={{ top: '50%', left: '50%', transform: 'translate(-50%, -50%)' }}>
+            <div className="text-sm font-semibold text-secondary-700 mb-2">Farbe wählen</div>
+            <div className="grid grid-cols-6 gap-1.5 mb-3">
+              {['#ef4444', '#f97316', '#f59e0b', '#eab308', '#84cc16', '#22c55e', '#10b981', '#14b8a6', '#06b6d4', '#3b82f6', '#6366f1', '#8b5cf6', '#a855f7', '#d946ef', '#ec4899', '#f43f5e', '#64748b', '#475569'].map((c) => (
+                <button
+                  key={c}
+ type="button"
+                  onClick={() => handleColorSelect(c)}
+                  className="w-7 h-7 rounded-md border-2 border-white shadow-sm hover:scale-110 transition-transform"
+                  style={{ backgroundColor: c, outline: colorPicker.color === c ? '2px solid #3b82f6' : 'none' }}
+                />
+              ))}
+            </div>
+            <div className="flex items-center gap-2">
+              <input
+                type="color"
+                value={colorPicker.color}
+                onChange={(e) => setColorPicker({ ...colorPicker, color: e.target.value })}
+                className="w-8 h-8 rounded cursor-pointer border border-secondary-200"
+              />
+              <input
+                type="text"
+                value={colorPicker.color}
+                onChange={(e) => setColorPicker({ ...colorPicker, color: e.target.value })}
+                className="flex-1 px-2 py-1 text-sm border border-secondary-200 rounded-md"
+              />
+              <button
+                type="button"
+                onClick={() => handleColorSelect(colorPicker.color)}
+                className="px-3 py-1 text-sm bg-primary-600 text-white rounded-md hover:bg-primary-700"
+              >
+                OK
+              </button>
+            </div>
+          </div>
+        </>,
+        document.body
+      )}
     </nav>
   );
 }