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Implement AT Protocol token refresh for seamless authentication master

- Add refresh_session method to AtProtoClient using /xrpc/com.atproto.server.refreshSession - Implement automatic 401 retry logic in publish_blip with token refresh - Add session persistence to CredentialStore (saves access/refresh tokens) - Update authentication flow to reuse stored sessions and validate on startup - Add comprehensive error handling with timeouts and session cleanup - Handle expired tokens transparently during long-running sessions 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>