feat: admin dark mode

client/store/admin.js

@@ -0,0 +1,13 @@
+export default {
+  namespaced: true,
+  state: {
+    theme: {
+      dark: false
+    }
+  },
+  mutations: {
+    setThemeDarkMode(state, payload) {
+      state.theme.dark = payload
+    }
+  }
+}