Fix Resolution Search Payload 500, Grok Vision Fallbacks, and Mobile Layout Rounded Edges

[ngoiyaeric]

This submission fixes the POST /index 500 error by sanitizing history payloads to remove raw base64 image strings before saving to the database, maps vision models correctly, improves timezone safety, and rounds visual edges and elements in the mobile layout. It also restores and unclips the missing Plus icon on mobile and styles empty screen cards elegantly.

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PR created automatically by Jules for task 254326844332553661 started by @ngoiyaeric

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Project	Deployment	Actions	Updated (UTC)
qcx	Ready	Preview, Comment	Jul 15, 2026 3:11am

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[charliecreates]

Blocking findings

1. app/actions.tsx:225-227 — image bytes are still persisted. The new sanitizedHistory replaces image parts only in the preceding history, but the resolution_search_result message still stores dataUrl, mapboxDataUrl, and googleDataUrl (raw data:*;base64,... strings). onSetAIState later serializes every message through saveChat, so this path still writes the screenshot payload to the database and can reproduce the reported POST /index 500. Keep the image bytes transient or persist object-storage references/metadata instead.

2. lib/utils/index.ts:44 and :90 — unsupported vision model identifier breaks the intended fallback. With requireVision true, both resolutionSearch and researcher select grok-vision-beta. The official xAI endpoint catalog lists grok-2-vision-1212 as the vision language model, with aliases grok-2-vision and grok-2-vision-latest, not grok-vision-beta. The selected-model branch rethrows initialization errors, while the default branch only wraps provider construction, so an image request cannot reliably fall back to another provider. Use a supported vision ID and handle fallback around the actual request.

Existing head checks were inspected but not rerun: GitGuardian passed; Supabase Preview was skipped; the Vercel preview check is green while the Vercel – qcx commit status is currently failing; the CLA status is pending.