feat: customize site banners and login notices

backend/app/routers/admin.py

@@ -20,7 +20,7 @@ from ..auth import (
     normalize_user_auth_provider,
     resolve_user_auth_provider,
 )
-from ..config import settings as env_settings
+from ..config import normalize_banner_color, settings as env_settings
 from ..network_security import validate_notification_target_url
 from ..db import (
     delete_setting,
@@ -174,6 +174,11 @@ NOTIFICATION_URL_SETTING_KEYS = {
     "magent_notify_webhook_url",
 }
 
+BANNER_COLOR_SETTING_KEYS = {
+    "site_banner_background_color",
+    "site_banner_border_color",
+}
+
 SETTING_KEYS: List[str] = [
     "jellystat_base_url",
     "jellystat_api_key",
@@ -260,6 +265,9 @@ SETTING_KEYS: List[str] = [
     "site_banner_enabled",
     "site_banner_message",
     "site_banner_tone",
+    "site_banner_background_color",
+    "site_banner_border_color",
+    "site_login_message",
     "site_login_show_jellyfin_login",
     "site_login_show_local_login",
     "site_login_show_forgot_password",
@@ -712,6 +720,11 @@ async def update_settings(payload: Dict[str, Any]) -> Dict[str, Any]:
             value_to_store = value_to_store.lower()
             if value_to_store not in {"days", "weeks", "months"}:
                 raise HTTPException(status_code=400, detail="Confirmation interval unit must be days, weeks, or months")
+        if key in BANNER_COLOR_SETTING_KEYS:
+            normalized_color = normalize_banner_color(value_to_store)
+            if not normalized_color:
+                raise HTTPException(status_code=400, detail=f"{key.replace('_', ' ')} must be a six-digit hex colour such as #ffc857")
+            value_to_store = normalized_color
         if key in URL_SETTING_KEYS and value_to_store:
             try:
                 value_to_store = _normalize_service_url(value_to_store)