fix: eliminate nav reload flicker via client routing with persisted WebGL header - #63
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Two full-page-load artifacts, both from masking layers added earlier this session: the page-enter reveal translated <main> 12px on every navigation (the 'content shifts down during loading'), and the always-on static SVG wave — a different shape than the WebGL shader — snapped to the shader on each reload (the 'shader jumps around'). Remove page-enter, and return the SVG to a fail-only WebGL fallback so it never competes with the live canvas. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Re-enable Astro ClientRouter and persist the header (transition:persist) so navigation swaps only the page content — the live WebGL canvas is never destroyed or re-initialised, eliminating the reload flicker and content reflow at the root. ALL view-transition animations are disabled (::view-transition-* animation:none) so there is no crossfade snapshot to render the GL canvas as a monochrome smear on Safari; swaps are instant. The wave init is now re-entrant and rebuilds its GL resources on webglcontextrestored (a canvas re-attach can drop the context on some browsers), with loop control outside the builder so a rebuild never stacks two rAF loops. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Summary
Clicking the logo (or any nav link) was a full-document reload, so the content re-laid-out (a few-px shift) and the WebGL header wave re-initialized (jump/flicker) every time. Adopts the static-site best practice — client-side routing that persists the shell — to remove the reload entirely. Verified clean on Safari before merge.
Changes
ClientRouterandtransition:persistthe header, so navigation swaps only the page content. The live WebGL canvas is never destroyed or re-initialized → no reload, no wave restart, no content reflow.::view-transition-* { animation: none }), so there's no snapshot window to render the GL canvas as a monochrome smear on Safari (the reason ClientRouter was removed before). Swaps are instant.webglcontextrestored(a canvas re-attach can drop the context on some browsers), with loop control outside the builder so a rebuild never stacks two rAF loops.page-entertransform (the content shift) and the always-on static SVG wave baseline (a different shape than the shader, which snapped on each reload). The SVG is back to a WebGL-fail-only fallback.Validation
Full pre-push suite passed: lint, type-check, content validation, unit tests (86), build. Client routing + persist + VT-disable rule confirmed in the built output. Manually verified flicker-free on Safari.
🤖 Generated with Claude Code