auth: say 'login server' not 'core' in user-facing text
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Rename the contexts-table column header to LOGIN SERVER, reword the logout --everywhere/--all-contexts help, and the TLS-check error so we never surface the internal 'core' term to users.
Co-Authored-By: Claude Opus 4.8 (1M context) noreply@anthropic.com Entire-Checkpoint: 0b31c2ff9960
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