fix: prod scroll resize, timer viewport reinit

[BODMAT]

What

Two production bugs fixed: Lenis scroll height was not recalculated after lazy-loaded charts rendered on /dashboard/music (visible only with real DB latency), and background timer field positions were not redistributed after viewport resize (mobile ↔ desktop), causing all timers to cluster on one side.

Changes

Code

• dashboard/components/smooth-scroll.tsx — ResizeObserver on document.body (not documentElement, which is fixed at viewport height via h-full) to call lenis.resize() automatically when page content grows
• dashboard/app/dashboard/music/music-client.tsx — direct lenis.resize() via useLenis() when query data arrives, as a second layer for the music page specifically
• dashboard/components/timer-field.tsx — on viewport resize, reinitialize timer x/y positions randomly across new dimensions (drift speed ~3px/s is too slow to redistribute naturally)

Tooling / config

• n/a

Docs / plan

• n/a

Design decisions

• document.body instead of document.documentElement — html { height: 100% } (Tailwind h-full in layout) locks offsetHeight to viewport; ResizeObserver never fires on it
• Dual-layer scroll fix (ResizeObserver + direct call in MusicClient) — ResizeObserver is generic but async; direct call on data change guarantees correct timing for the music page after Neon latency
• Timer reinit over position scaling — scaling compressed all positions into a small range; random scatter is instant and unnoticeable on a subtle decorative background

Verification

• npx tsc --noEmit (dashboard) — clean
• npm run lint (dashboard) — clean
• Manual: npm run build && npm start + 3G throttle + CPU 4× + Disable cache → /dashboard/music direct URL — scroll reaches bottom after charts load
• Manual: DevTools responsive mode → toggle mobile ↔ desktop → timers redistribute across full viewport

Out of scope (future PRs)

• n/a

Closes

• n/a (prod bugfix)

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Project	Deployment	Actions	Updated (UTC)
worktrace	Ready	Preview, Comment	Jun 3, 2026 11:43am