The endpoint header dot previously reflected only the last manual 'Test
endpoint' result (green=ok / red=fail / gray=never tested), so a configured,
enabled endpoint looked gray until probed. Rebind it to a synchronous
derivation from the form + feature toggle (no network):
ready (green) configured AND enabled
configured (yellow) configured but feature off
misconfigured(orange) feature on but not configured (real misconfig)
off (gray) not configured and not enabled
'Configured' = model filled AND a Base URL present (own or inherited from
Chat); API key not required (local servers). Adds a Tooltip on the dot so
color isn't the only signal. The Test button result stays as text.
Implements docs/backlog/ai-endpoint-status-dot-config-enabled.md.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>