Implement clickable notifications

I'm not sure about the get function pattern here as it doesn't include a value to base reactivity on; I might be too used to Svelte though and maybe that's fine

packages/frontend/src/store.ts

@@ -468,6 +468,10 @@ export const defaultStore = markRaw(new Storage('base', {
 		where: 'device',
 		default: 'horizontal' as 'vertical' | 'horizontal',
 	},
+	notificationClickable: {
+		where: 'device',
+		default: false,
+	},
 	enableCondensedLineForAcct: {
 		where: 'device',
 		default: false,