feat(frontend): render and cache water shader across routes

[petercr]

Summary

• move WaterShader mounting from the home route into GlobalLayout so it appears across routes
• add one-time shader module preload/caching in root layout to avoid reloading on route changes
• keep content layered above shader via a shared layout z-index style

Testing

• npx biome check apps/frontend/src/components/GlobalLayout/GlobalLayout.tsx apps/frontend/src/components/GlobalLayout/GlobalLayout.css.ts apps/frontend/src/pages/Home/Home.tsx
• npm run type-check --workspace=@santan/frontend (fails due existing unrelated vite.config.ts typing issue)

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Project	Deployment	Actions	Updated (UTC)
ccw	Ready	Preview, Comment	Apr 15, 2026 2:56am