feat(help-notifications): in-app troubleshooting, collapsibles, scroll-to-top

- Move NOTIFICATION_TROUBLESHOOTING content into HelpNotificationsView with prose styling
- Remove exact-alarms section from doc and view (feature removed from app/plugin)
- Add collapsible iOS/Android sections (open by default for current platform)
- Add rotating carets on collapsible summaries
- Add bullet for 10-minute rollover option in "If it still doesn't work"
- Add @tailwindcss/typography plugin for prose classes
- Reset #app scroll on route change so Help Notifications opens at top

tailwind.config.js

@@ -4,5 +4,5 @@ module.exports = {
   theme: {
     extend: {},
   },
-  plugins: [],
+  plugins: [require("@tailwindcss/typography")],
 };