feat(themes): add per-theme special effects, wild mode & w hotkey

Each of the 14 themes now has three interactive effect hooks:
- Navigation (j/k): brief thematic flash/shake/glitch per theme
- Page change (h/l): zoom/warp/tunnel transition per theme
- Wild mode (w key): toggles background animation into overdrive

Wild-mode effects per theme:
- neon: rings spin 14x, particles vortex
- matrix: rain falls 10x faster
- volcano: embers/smoke 8x/5x, lava glows brighter
- brutalist: boxes 15x + random jitter
- aurora/ocean/plasma/cosmos/dos/synthwave/terminal/retro/spaceage/retrofuture:
  time-offset approach accelerates all sine-based animations 8-11x

Shared infrastructure added to nav.tmpl:
- sno-shake/sno-zoom-fwd/sno-glitch CSS keyframes
- #sno-wild-badge pulsing red overlay badge
- selectPost() calls snonuxNavEffect()
- h/l navigation calls snonuxPageEffect()
- w key calls snonuxWildToggle()

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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