QA round 1 found: HTTP 400 from Synapse was misread as "federation
disabled", falsely confirming isolation on a rejected request instead
of a real disabled state. Only 404 (no such admin endpoint) now maps
to that state; 400 falls through to the 502 error path.
Also fixes: nextToken type mismatch (Synapse sends a string, hook
declared number), empty-state panel wrongly shown on pages beyond the
last result, and a NaN guard when advancing pagination.
AC amended: "letzter erfolgreicher Kontakt" removed — Synapse's
destinations list endpoint has no such timestamp, only retry_last_ts
for failed attempts.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
patrickandClaude Sonnet 5
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