Fix Toolbar Visibility in Fullscreen Reviewer Mode

[theMr17]

Purpose / Description

This PR fixes the bug where the toolbar is hidden in semi-fullscreen reviewer.

Fixes

• Fixes [BUG]: "Hide the system bars" also hides the top ankidroid bar #15762

Approach

• Updated FullScreenMode enum:
  • Renamed BUTTONS_ONLY to BUTTONS_AND_MENU_ONLY.
  • Renamed BUTTONS_AND_MENU to BUTTONS_AND_MENU_WITH_STATUS_BAR.
• Added enableEdgeToEdge() in Reviewer.
• Moved toolbar into the reviewer_fullscreen layout.
• Moved answer buttons in reviewer_fullscreen_noanswers layout.
• Updated fitsSystemWindows to exclude BUTTONS_AND_MENU_WITH_STATUS_BAR.
• Updated fitsSystemWindows to true in reviewer_fullscreen_noanswers.xml to ensure that the card content does not get obscured by the camera cutout.
• Removed fitsSystemWindows from reviewer_answer_buttons.
• Update old fullscreenReview preference to use new enum.

How Has This Been Tested?

Fullscreen mode	Reviewer	Reviewer (answer revealed)
Off
Hide the system bars
Hide the system bars and answer buttons

Checklist

Please, go through these checks before submitting the PR.

• 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