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

docs/NOTIFICATION_TROUBLESHOOTING.md

@@ -57,18 +57,6 @@ If you recently restarted iOS and don’t see the notification, open **TimeSafar
 3. Turn notifications **on**
 4. If Android shows notification categories/channels for the app, ensure the relevant channel is allowed.
 
-### Exact alarms (Android 12+ / some devices)
-
-Daily notifications may require **Exact alarms** to fire at the precise time.
-
-- Open **Settings** → **Apps** → **TimeSafari**
-- Look for **Alarms & reminders** / **Exact alarms** (wording varies)
-- Turn **Allow** on
-
-If you don’t see that option:
-
-- Search Android settings for **Exact alarms**, **Alarms & reminders**, or **Special app access**
-
 ### Battery / background restrictions
 
 Battery optimization can delay or block scheduled notifications.