Chat keeps its relay subscriptions alive while the app is on screen.

New messages rang in Vector but sat unseen in v3 until a reload. The
resume hook only rebuilds subscriptions after an absence it was told
about; a socket that errors while the page stays visible (a wifi hop, a
laptop lid, a phone freezing the tab without the away timer noticing,
another tab clearing that timer first) is dropped from the nostr-tools
pool with every subscription it carried, and nothing dials it again.

A watchdog now runs whenever the app is on screen: on focus, on becoming
visible, and every ten seconds between. It asks the pool whether each
relay the inbox and the rooms listen on still holds a live socket (a dial
hung past 20s counts as dead, and a relay that closed a subscription on us
counts too) and rebuilds the lot when one is missing, dropping a stuck
relay first so the rebuild dials afresh. Rebuilds retry on a growing
backoff while a relay keeps refusing. tools/chat-watchdog-test.js errors
every socket under an open room and checks the recovery.

Co-Authored-By: Claude Fable 5.1 <[email protected]>
Claude-Session: https://claude.ai/code/session_01JuwQqNWtDJcxPWtEm9134z

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