feat: animate StatsModal bars and stat numbers on modal open

[albert239825]

Summary

Upgrades the StatsModal win distribution from static bars to animated bars that grow on modal open, plus a count-up animation for the stat numbers.

Bar animation: Added @keyframes growBar that animates width from 0% → var(--bar-width). Each Progress row receives a staggered animation-delay via CSS custom property (--stagger-delay: ${index * 0.1}s), so bars cascade in sequentially.

Stat count-up: StatItem now accepts isOpen and uses useState/useEffect to animate the displayed number from 0 → target over ~500ms (20 steps via setInterval). Resets to 0 when the modal closes so it replays on reopen.

// key addition to .line
animation: growBar 0.5s ease-out forwards;
animation-delay: var(--stagger-delay, 0s);

// Progress passes custom properties as inline style
style={{ '--bar-width': `${8 + size}%`, '--stagger-delay': `${index * 0.1}s` }}

Link to Devin session: https://app.devin.ai/sessions/9240699c31bb40fba0e3ff0696399f32
Requested by: @albert239825

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Testing Results

Tested the animated StatsModal locally with npm run start and varied win distribution data in localStorage.

Animation Tests (all passed)

Test	Result
Bars animate from 0% → final width with staggered delays	✅ Passed
Stat numbers count up from 0 → target over ~500ms	✅ Passed
Animations reset and replay on modal re-open	✅ Passed

Bar animation proof (CSS inspection):

• All 6 bars use growBar keyframe animation with 0.5s ease-out forwards
• Stagger delays: 0s, 0.1s, 0.2s, 0.3s, 0.4s, 0.5s
• Bar widths proportional: row 3 (value=12) = 98%, row 1 (value=1) = 15.5%

Count-up proof (MutationObserver, 52 captures):

• t=0ms: [0, 0, 0, 0]
• t=499ms: [31, 84, 4, 7]

Reset proof:

• On re-open, bars start at 0px and stats start at [0,0,0,0]

Screenshots

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Devin session