feat(menu): enhance navigation and retry functionality

[PresenceOP-Coder]

Description

This pull request introduces level-specific backgrounds and scorer logic, along with UI improvements.
EnvironmentManager sets custom skyboxes for each level (scenes 1, 4, 5) automatically.
Scorer script tracks player hits with different limits per level and reloads the scene on exceeding the limit.
UI buttons now support custom images, and text elements have background images for better readability.
These changes improve gameplay mechanics and visual distinction between levels.

Semver Changes

• Patch (bug fix, no new features)
• Minor (new features, no breaking changes)
• Major (breaking changes)

Issues

List any issues that this pull request closes.

• Closes Implement Level Progression and Difficulty #3

Checklist

• I have read the Contributing Guidelines.
• Level-specific backgrounds work correctly for scenes 1, 4, 5.
• Scorer reloads the scene on hit limit.
• UI buttons display custom images.
• Text elements have proper backgrounds.

List any issues that this pull request closes.

Checklist

• I have read the Contributing Guidelines.

[PresenceOP-Coder]

@maintainer Please add the required labels: Type, Semver, and PR:Accept.

[Just-Here-TO-Code]

Thanks for making the required changes, I am merging your PR.

[PerHac13]

has been re evaluated