Center the API overview page

[snario]

What changed

• Center the OpenAPI overview/landing route, including the authored Tempo API overview at /docs/api.
• Keep generated endpoint group pages full width for their two-column request/response playgrounds.
• Extend the wide-viewport regression test to cover the overview, authored guide, and endpoint-reference layouts.

Root cause

The earlier fix updated OpenApiGuide, which covers authored pages beneath the OpenAPI mount, but /docs/api is rendered through the separate OpenApiPage landing branch. That branch still explicitly requested content.width = "full", collapsing the centering gutter even though the overview has no right-hand operation panel.

Impact

The Tempo API overview now uses the same centered readable column as other single-column docs. Generated endpoint reference groups are unchanged.

Screenshots

Before

After

Validation

• pnpm build
• pnpm exec biome check e2e/openapi-layout.test.ts
• CI=true pnpm exec playwright test e2e/openapi-layout.test.ts --project=chromium

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Project	Deployment	Actions	Updated (UTC)
tempo-docs	Ready	Preview	Aug 15, 2026 1:02am