Add auth token propagation for Poetic Brain chat

[DHCross]

Summary

• persist Auth0 status and access tokens for chat sessions so Math Brain payloads resolve to the right user scope
• attach stored bearer tokens to Poetic Brain API requests to satisfy allowlist authentication

Testing

• Not run (not requested)

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Codex Task

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Refresh auth tokens before Raven requests

The Authorization header for every Raven call is populated from whatever value happens to be in localStorage (getAuthToken), but that token is only fetched once during the initial Auth0 bootstrap in RequireAuth (lines 111‑130) and is never refreshed. Auth0 access tokens expire (typically ~1h) and app/api/raven/route.ts rejects expired tokens via verifyToken, so any user who keeps the chat open past the token lifetime will start getting 401s even though the UI still marks them as authenticated. Without re‑calling getTokenSilently or another refresh path before setting this header, long-running sessions will break until the page is reloaded.

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