move dev mode hook (#8270)

src/storage/hooks/dev-mode.ts

@@ -0,0 +1,7 @@
+import {device, useStorage} from '#/storage'
+
+export function useDevMode() {
+  const [devMode = false, setDevMode] = useStorage(device, ['devMode'])
+
+  return [devMode, setDevMode] as const
+}