feat: display user-facing FSRS version

[david-allison]

This was causing confusion for users

• Fixes Expose user-facing FSRS version #18825

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
• UI changes: include screenshots of all affected screens (in particular showing any new or changed strings)
• UI Changes: You have tested your change using the Google Accessibility Scanner

[david-allison]

This will break on backend update - feels like the right thing to do for now

[BrayanDSO]

LGTM