feat: Made linux compatible:

[rajzzz]

fix: cross-origin isolation + WebGPU + playback backpressure (Linux)

What

Three changes to fix laggy/frozen preview on Linux:

1. COOP/COEP/CORP headers on the dev server so crossOriginIsolated === true
2. crossOrigin: "anonymous" on the Umami analytics script (required under COEP)
3. Compositor backpressure in the preview playback loop

Why

Headers (vite.config.ts): The render engine needs SharedArrayBuffer, which requires crossOriginIsolated. TanStack Start uses Nitro as the HTTP handler — Vite's server.headers is bypassed for document responses, so the headers must go in nitro.routeRules. Using credentialless instead of require-corp since third-party scripts (Umami, unpkg) don't serve Cross-Origin-Resource-Policy headers.

Playback freeze (preview-panel.tsx): The previous fire-and-forget void compositor.renderFrame() let Comlink messages queue up faster than the worker could drain them on Linux/Vulkan (~20ms GPU turnaround vs ~16ms tick rate). After a few seconds the compositor was rendering frames from the past while the timeline ran live. Fix: compositorBusyRef skips the entire render cycle (capture + upload + render) when the worker hasn't finished the previous frame, so the queue never grows.

Verified

• crossOriginIsolated === true, typeof SharedArrayBuffer === "function"
• WebGPU adapter: vendor: "nvidia", isFallbackAdapter: false
• Playback no longer freezes

Linux dev note: also requires Chromium flags --disable-gpu-sandbox --enable-features=Vulkan,UseSkiaRenderer,VulkanFromANGLE --use-vulkan=native --use-angle=vulkan to get a real GPU adapter instead of SwiftShader.

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[rajzzz]

I have read the CLA Document and I hereby sign the CLA