Move files in preparation for monorepo migration

apps/knossos/plugins/1.theme.js

@@ -0,0 +1,27 @@
+export default defineNuxtPlugin(async (nuxtApp) => {
+  await useAuth()
+  await useUser()
+  const themeStore = useTheme()
+  const cosmetics = useCosmetics()
+
+  nuxtApp.hook('app:mounted', () => {
+    if (process.client && themeStore.value.preference === 'system') {
+      const colorSchemeQueryList = window.matchMedia('(prefers-color-scheme: light)')
+
+      const setColorScheme = (e) => {
+        if (themeStore.value.preference === 'system') {
+          if (e.matches) {
+            updateTheme('light')
+          } else {
+            updateTheme(cosmetics.value.preferredDarkTheme ?? 'dark')
+          }
+        }
+      }
+
+      setColorScheme(colorSchemeQueryList)
+      colorSchemeQueryList.addEventListener('change', setColorScheme)
+    }
+  })
+
+  nuxtApp.provide('colorMode', themeStore.value)
+})