* feat(gateway,ui): add Model Auth status card to Overview
Adds a new `models.authStatus` gateway endpoint that combines
`buildAuthHealthSummary()` (token expiry/status) with
`loadProviderUsageSummary()` (rate limits) into a single response
suitable for UI rendering. Strips credentials - only ships status,
expiry, remaining time, and rate-limit windows.
Adds a corresponding "Model Auth" card to the Overview dashboard
showing provider token status and rate limits at a glance. Attention
items are raised when OAuth tokens are expiring or expired.
Also catches the OAuth token sink class of bug: if multiple profiles
exist per provider/account and tokens are drifting out of sync, this
surfaces it immediately in the dashboard instead of silently falling
back to a different provider.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
* CHANGELOG: note Model Auth status card on Overview
* UI/Overview: render Model Auth card during load with N/A placeholder
* models.authStatus: env-backed OAuth escape hatch + expectsOAuth missing signal
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Co-authored-by: Lobster <10343873+omarshahine@users.noreply.github.com>
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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