Add support for Grok 4.3 model selection

[ngoiyaeric]

This PR adds support for the newly released Grok 4.3 model from xAI. Both Grok 4.2 and Grok 4.3 are now available in the settings and can be toggled by the user.

Key changes:

• UI: Added "Grok 4.3" option to ModelSelectionForm with a "New" badge.
• Backend: Updated getModel in lib/utils/index.ts to map "Grok 4.3" selection to the grok-latest model ID.
• Logic: Preserved "Grok 4.2" support using grok-4-fast-non-reasoning.

Fixes: #581

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PR created automatically by Jules for task 17538991638682265224 started by @ngoiyaeric

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Project	Deployment	Actions	Updated (UTC)
qcx	Ready	Preview, Comment	May 12, 2026 7:17am

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Reviewing files that changed from the base of the PR and between d0efce4 and 6ebe0f1.

📒 Files selected for processing (2)

• components/settings/components/model-selection-form.tsx
• lib/utils/index.ts

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