Purpose / Description

Renames ScheduleReminders to ScheduleRemindersFragment. Refactors AddEditReminderDialog to use viewbinding.

Fixes

• Precursor to the larger fragment refactor and UI cleanup I'm working on for the review reminders system: making sure the UI looks good on mobile, tablet, edge-to-edge, no matter where it's opened from, adhering to the styling of the Settings pages, etc. etc... it's taking a while long than I would like, so let's get this bit I'm 100% confident in merged first.

How Has This Been Tested?

• Physical Lenovo M11 Tablet, API 35
• Physical Samsung S23, API 34
• Launching, opening screen from all sources, CRUD'ing reminders all works

Checklist

• You have a descriptive commit message with a short title (first line, max 50 chars).
• You have commented your code, particularly in hard-to-understand areas
• You have performed a self-review of your own code