Spin lock, gravity drops, jackpot-coherent crazy mode, win-beat polish

[WERSIT35]

Spin lifecycle:

• Add engine/spin-lock.js state machine (idle/starting/animating) and guard spin() before any await so spamming the button can't start concurrent spins (fixes mid-spin glitches). Released on success/error/cancel. Vitest coverage.

Drop animation:

• Refill cells now start exactly where they last rested (drop the 1.15x overshoot) so they no longer hop upward before falling.
• Spin-end board exit uses true t^2 gravity instead of a near-linear slide.
• Remove the at-rest pre-draw in animateRound that flashed the generated board for a frame before it dropped.

Win beat:

• Deliberate sequence per 8+ catch: hold/celebrate (2.5s opening, 1.5s chained tumbles) -> explode fully -> then drop the refill (no overlap), committed synchronously so cleared cells never flash old symbols.
• Celebration glow sustains with a shimmer across the hold; winner halo breathes with the pulse.

Go Crazy:

• Boost premium-symbol density and add same-type clustering so boards visibly flood with high-value symbols (gated entirely behind crazy mode; base RTP unchanged).

[vercel]

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Project	Deployment	Actions	Updated (UTC)
provider	Ready	Preview, Comment	Jun 22, 2026 9:00am