feat(tui): add lightweight animation system with memory-safe design

[WqyJh]

Summary

• Add animation utility library with easing functions, timers, and frame hooks
• Add MessageAppear, SlideIn, PulseGlow transition components
• Add TypingIndicator, ProgressBar UI components
• Add RippleEffect, FloatingDots, BreathingBorder visual effects
• Add EnhancedSpinner with 6 animation styles (dots, line, pulse, wave, orbit, bounce)
• Add MatrixRain, ParticleSystem, ScanLine, GlitchEffect, NeonGlow, TypewriterText
• Add animation config system with themes (minimal, subtle, balanced, vibrant, cyberpunk, nature)
• Add AnimationPerformanceMonitor with FPS tracking and memory monitoring
• Add /animations command for settings dialog and /animation-showcase for demo
• All animations respect animations_enabled KV setting
• Proper cleanup of setInterval/requestAnimationFrame in onCleanup
• No memory leaks: all timers cancelled on component unmount

New Files

• util/animation.ts - Animation utility library
• component/message-appear.tsx - Message appear, slide-in, typing indicator, progress bar, pulse glow
• component/ripple.tsx - Ripple effect, wave effect, breathing border, floating dots
• component/enhanced-spinner.tsx - 6 spinner styles with fallback
• component/effects.tsx - Matrix rain, particles, scan line, glitch, neon glow, typewriter
• component/animation-config.tsx - Animation config system and settings UI
• config/animation-themes.ts - 6 animation themes
• component/dialog-animation-settings.tsx - Animation settings dialog
• component/animation-showcase.tsx - Interactive animation demo
• component/animation-performance.tsx - FPS monitor and performance graph

Modified Files

• app.tsx - Added /animations and /animation-showcase commands
• startup-loading.tsx - Uses PulseSpinner with SlideIn transition
• routes/home.tsx - Added SlideIn/MessageAppear transitions

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Mirrored from XiaomiMiMo/MiMo-Code#553 — original author @xjwm5685-ui.