Ensure settings are persisted before we navigate for onboarding dismissal (#2678)

* Nicer types on OnboardingPaths

* Update persistSettings to be a service

src/lib/paths.ts

@@ -17,15 +17,17 @@ const prependRoutes =
     )
   }
 
+type OnboardingPaths = {
+  [K in keyof typeof onboardingPaths]: `/onboarding${(typeof onboardingPaths)[K]}`
+}
+
 export const paths = {
   INDEX: '/',
   HOME: '/home',
   FILE: '/file',
   SETTINGS: '/settings',
   SIGN_IN: '/signin',
-  ONBOARDING: prependRoutes(onboardingPaths)(
-    '/onboarding'
-  ) as typeof onboardingPaths,
+  ONBOARDING: prependRoutes(onboardingPaths)('/onboarding') as OnboardingPaths,
 } as const
 export const BROWSER_PATH = `%2F${BROWSER_PROJECT_NAME}%2F${BROWSER_FILE_NAME}${FILE_EXT}`