perf: Lazy-load canvas-confetti — remove ~40kB from main bundle

[hessius]

Closed by #262 — v2.2.0 released.

[hessius]

Implementation Status: ✅ Complete

PR #262 implements lazy-loading for canvas-confetti:

• Converted static import confetti from 'canvas-confetti' to dynamic import('canvas-confetti')
• Confetti is now only loaded when the user completes their first shot
• Reduces initial bundle size for users who don't trigger confetti

Bundled alongside the MachineService ControlCenter edits in commit e3c3526.