Feat global state (#861)

* add zustand, add auth store

* add user config store, isAdmin from store

* move ColourVariants, fix importColours

* get userConfig from store

* fix name conflict

* home filter bar from config store

* use user store for channel list

* use userConfig store for channel pages

* use userConfig for playlist pages

* fix channel video type navigation

* use userConfig update on downloads page

* fix view style in search

* handle initial user config, take 2

* modify userSettings in global state

frontend/package.json

@@ -13,7 +13,8 @@
     "dompurify": "^3.2.3",
     "react": "^19.0.0",
     "react-dom": "^19.0.0",
-    "react-router-dom": "^7.0.2"
+    "react-router-dom": "^7.0.2",
+    "zustand": "^5.0.2"
   },
   "devDependencies": {
     "@types/react": "^19.0.1",