feat: add server-side configuration with default theme (#90)

* docs: add example for usage of the main listenbrainz instance (#71)

* docs: add example for usage of the main listenbrainz instance

* Update scrobbler.md

---------

Co-authored-by: Gabe Farrell <90876006+gabehf@users.noreply.github.com>

* feat: add server-side cfg and default theme

* fix: repair custom theme

---------

Co-authored-by: m0d3rnX <jesper@posteo.de>

client/app/providers/AppProvider.tsx

@@ -1,10 +1,11 @@
-import type { User } from "api/api";
+import { getCfg, type User } from "api/api";
 import { createContext, useContext, useEffect, useState } from "react";
 
 interface AppContextType {
   user: User | null | undefined;
   configurableHomeActivity: boolean;
   homeItems: number;
+  defaultTheme: string;
   setConfigurableHomeActivity: (value: boolean) => void;
   setHomeItems: (value: number) => void;
   setUsername: (value: string) => void;
@@ -22,6 +23,7 @@ export const useAppContext = () => {
 
 export const AppProvider = ({ children }: { children: React.ReactNode }) => {
   const [user, setUser] = useState<User | null | undefined>(undefined);
+  const [defaultTheme, setDefaultTheme] = useState<string | undefined>(undefined)
   const [configurableHomeActivity, setConfigurableHomeActivity] = useState<boolean>(false);
   const [homeItems, setHomeItems] = useState<number>(0);
 
@@ -42,9 +44,15 @@ export const AppProvider = ({ children }: { children: React.ReactNode }) => {
 
     setConfigurableHomeActivity(true);
     setHomeItems(12);
+
+    getCfg().then(cfg => {
+      console.log(cfg)
+      setDefaultTheme(cfg.default_theme)
+    })
   }, []);
 
-  if (user === undefined) {
+  // Block rendering the app until config is loaded
+  if (user === undefined || defaultTheme === undefined) {
     return null;
   }
 
@@ -52,6 +60,7 @@ export const AppProvider = ({ children }: { children: React.ReactNode }) => {
     user,
     configurableHomeActivity,
     homeItems,
+    defaultTheme,
     setConfigurableHomeActivity,
     setHomeItems,
     setUsername,