BTHLABS-60: Appearance settings

Co-authored-by: Tomek Wójcik <labs@tomekwojcik.pl>
Co-committed-by: Tomek Wójcik <labs@tomekwojcik.pl>

services/backend/hotpocket_backend/apps/ui/views/meta.py

@@ -9,6 +9,10 @@ from hotpocket_backend.apps.core.conf import settings
 
 
 def manifest_json(request: HttpRequest) -> JsonResponse:
+    light_theme = False
+    if request.user.is_anonymous is False:
+        light_theme = request.user.settings.get('light_theme', None) or False
+
     result = {
         'name': settings.SITE_TITLE,
         'short_name': settings.SITE_SHORT_TITLE,
@@ -16,8 +20,17 @@ def manifest_json(request: HttpRequest) -> JsonResponse:
             reverse('ui.associations.browse'),
         ),
         'display': 'standalone',
-        'background_color': '#212529',
-        'theme_color': '#2b3035',
+        'background_color': (
+            '#212529'
+            if light_theme is False
+            else '#ffffff'
+        ),
+        'theme_color': (
+            '#2b3035'
+            if light_theme is False
+            else
+            '#f8f9fa'
+        ),
         'icons': [
             {
                 'src': request.build_absolute_uri(