fix: degrade mixed CrUX failures to no-data

[cursor]

Description

Fixes a regression in WEBVITALS-2Q.

• Root cause: getRealWorldPerformance treated any upstream CrUX fetch error as fatal when no usable metrics were returned, even if another requested device completed successfully but legitimately had no CrUX field data.
• Regression vector: Release 3dad06a481817bc715ba83934de828125c64fb2c still shipped the strict fatal gate, so transient Google CrUX 500s reopened the issue whenever the other device response produced no usable metrics. I could not identify a resolving commit/PR from the Sentry MCP activity payload.
• Fix: Only throw when every requested device fetch fails. Mixed error + no-data outcomes now degrade to hasData: false, which preserves the existing empty-state UI/workflow path instead of surfacing a workflow error.

Type of Change

• Bug fix
• New feature
• Documentation
• Refactoring

Sentry Context

• Issue: https://sentry.sentry.io/issues/7272648133/
• Regressed in release: 3dad06a481817bc715ba83934de828125c64fb2c
• Previously resolved by: Not available from the Sentry MCP issue payload / no matching repo commit found

Verification

• pnpm check-types passes.
• pnpm lint still fails because of pre-existing repo-wide Biome violations unrelated to this change.
• Replayed the affected request locally with POST /api/chat for https://dbavc-ca.vercel.app; the route now returns 200 OK with a workflow run ID instead of bubbling the CrUX failure.
• Resumed that workflow in a headless browser and verified the UI renders the existing No CrUX data available empty state rather than crashing.
• Screenshot captured during local verification (automation environment does not support attaching the image directly in this PR body).

Checklist

• Tested locally
• Types pass (pnpm check-types)
• Linting passes (pnpm lint)

Test plan

• Type checker passes
• Linter passes (blocked by pre-existing repo issues unrelated to this fix)
• Affected code path manually verified in browser

  

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Project	Deployment	Actions	Updated (UTC)
webvitals-com	Ready	Preview, Comment	Apr 14, 2026 6:43pm