[super-productivity] Allow manual selection of reminder type (ring vs notification)

### Problem Statement Currently, reminders trigger the same way for all tasks. However, different tasks require different levels of urgency. For example: Some reminders only need a simple notification. Others require a loud ring/alarm because they are critical and easy to miss. Right now there is no way to control this per task. ### Possible Solution Allow users to manually select the reminder type for each task. There should also be a default reminder type (e.g., Notification) so users don’t have to manually configure this for every task. The per-task setting would override the default when needed. Example use cases Medication reminder → Notification only (default) Important meeting or deadline → Alarm / ring Additionally, the reminder sound seems to depend on the device. On some phones the sound may be too quiet, and users cannot change it from within the app. Allow users to select or change the reminder sound for alarm-type reminders.