Respect closed default panels

[samuelstroschein]

Summary

• keep sidebar panels collapsed when a host passes an empty defaultOpenPanels list
• preserve the existing minimum-width recovery only when the left panel should open by default
• add regression coverage for opening a document with both panels collapsed

Why

The layout size recovery expanded a zero-width left panel even when the host explicitly configured the panel to start closed. This made host-level document modes unable to present a focused, panel-free initial view.

Impact

Hosts can now reliably use defaultOpenPanels: []; users can still reopen either panel with the existing controls.

Validation

• pnpm exec vitest run src/create-atelier.test.tsx — 5 passed
• pnpm run typecheck
• pnpm exec oxfmt --check src/create-atelier.test.tsx src/shell/layout-shell.tsx
• focused oxlint on both changed files

---

Note

Low Risk
Small conditional change in layout sizing plus test coverage; no auth, data, or API surface changes.

Overview
Hosts can use defaultOpenPanels: [] with filesViewMode: "sidebar" and get a document-focused layout without side panels opening on their own.

layout-shell.tsx only applies the sidebar minimum-width recovery (bumping a near-zero left size back to the default left width) when the left panel is meant to open by default (defaultLeftPanelOpen). Previously that recovery ran whenever stored left width was collapsed, which overrode an explicit “start closed” host config.

A regression test in create-atelier.test.tsx opens a file with both panels collapsed and asserts the left/right toggle buttons stay aria-pressed="false" after the document loads.

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	atelier-preview	0635f04	Commit Preview URL Branch Preview URL	Jul 14 2026, 05:27 PM