Feat(Sprint-Math): Redesign activity with new 'Math Pop!' UI

[samriddhitiwary]

Description
This PR overhauls the Sprint Math activity with a complete UI redesign. The current UI is very minimal and not very interesting for kids. This update replaces it with a "Math Pop!" theme, as children respond much better to colourful and interactive UIs that feel fun and engaging.

Key UI Changes
Vibrant Theme: Replaced the plain white background and simple red squares with a colorful blue gradient and bubble theme.

Interactive Buttons: Answer buttons are now round, colorful, and "poppable," making them more inviting to click.

Engaging Animations (Feedback):
Correct: The selected answer button "bounces" and flashes green.
Wrong: The selected button "shakes" and flashes red (and the correct answer is highlighted).
Score: The score number "pops" (scales up) every time a point is earned.

Cleaner Layout: Stats (Time, Score) are moved to a clear, high-contrast bar at the top for better readability.

Current UI:

New Modified UI:

[samriddhitiwary]

@llaske please review it

[llaske]

SprintMath is deprecated.
Regarding design, Sugarizer use intentionally a light and simple design. I suggest you to read this article for more.

[samriddhitiwary]

@llaske
I noticed that a few of my recently raised issues were not accepted, and I completely understand — thank you for taking the time to review them. I genuinely wish to contribute effectively to Sugarizer, so I was wondering if you could kindly suggest any specific bugs or features that you would like to see worked on. If it’s within my ability, I would be more than happy to implement it.
Thank you for your time and guidance!