[Desktop] v1.18.30: first-launch splash overlay never hides (white screen with pulsing logo, UI works underneath)

Environment

• OS: Windows 11 (x64), WSL2 host
• opencode desktop v1.18.30 (NSIS installer opencode-desktop-win-x64.exe), Electron 42.3.3 / Chromium 148.0.7778.218
• Install path: C:\Users\<user>\AppData\Local\Programs\@opencode-aidesktop

Symptom

On launch, the app shows a full-screen white/light overlay containing a single pulsing "O" logo (styled like the OPENCODE mark) that never disappears. The actual app UI is fully rendered and functional underneath (left sidebar, project list, top bar, settings) — accessible visually only via DevTools screenshots.

Reproduction

1. Install and run the desktop app on a fresh profile.
2. White screen with pulsing "O" appears and stays indefinitely.

Already ruled out

• Overlay persists across: app restarts, --disable-gpu, page reload via DevTools (CDP), and deleting the profile dir (C:\Users\<user>\AppData\Roaming\ai.opencode.desktop).
• Clicking the overlay does nothing; it is not a GPU/compositor issue (CDP screenshots render fine; the page compositor is live).
• The UI under the overlay is fully interactive.

Technical detail

The stuck element is a fixed full-viewport overlay:
DIV.fixed.inset-0.z-[9999].flex.flex-col.items-center.justify-center.bg-background-base
containing a single pulsing inline SVG (logo) with animation: pulse-opacity.
The real app content sits beneath it in the DOM and functions normally.

Sidecar server starts OK; renderer loads oc://renderer/index.html.
Renderer log line: [desktop-onboarding] first launch onboarding pending { pending: true }.
No console errors observed on load; Page.reload re-renders the same stuck splash (deterministic).

Expected behavior

The splash/onboarding overlay should hide once the app is ready (or onboarding completes) so the app is usable.

Impact

Desktop app is effectively unusable on this machine. (CLI opencode works fine.)