Build Speedy Circles SwiftUI game

[muvaf]

Summary

• Replace the placeholder SwiftUI view with the Speedy Circles game flow
• Add interval selection, animated circle gameplay, score/time HUD, timeout failure state, and retry
• Keep circles bounded with a minimum size while shrinking, changing color, and moving after each successful tap

Testing

• bazelisk --digest_function=sha256 build --config=limrun //App
• bazelisk --digest_function=sha256 build --config=limrun --remote_download_outputs=toplevel //App
• Limrun simulator smoke test: selected interval, started a run, tapped circles, confirmed score increment/timer reset/circle shrink+move, confirmed timeout final score, and confirmed Retry returns to start

Previews

• Limrun iOS preview build
• Live Limrun simulator
• Demo video:

speedy-circles-demo.mp4

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