Two console-noise fixes from a live error dump:
- remote-relay.ts reconnected on a FIXED 5s interval with no backoff, so when
the backend is briefly down it floods the console/network with failed-WS
attempts for the whole outage. It's a secondary feature (companion input), so
add exponential backoff 1s->30s (mirrors websocket.ts), reset on open/start.
- cryptpad's catalog/marketplace entries pointed at a non-existent
/assets/img/app-icons/cryptpad.webp -> a 404 on every marketplace render.
Point it at the existing default icon (handleImageError swapped to it anyway).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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