fix(hub): a reconnect re-reads the index, not just the handshake

_reconnectLoop re-did the handshake and nothing else, so a page kept
whatever it last saw until someone reloaded it. That is invisible until
the node restarts: it rebuilds its index from index_cache.db, which
holds no enrichment, and Music is the one app whose enrichment is
persisted nowhere — for the length of the re-read pass it serves tracks
with no artist, and the album grid drew nothing.

onReconnected was one slot the video player took on open and cleared on
close; it is a listener set now, and carries the fresh ack.

docs/MESHBAY_DESIGN.md §15.3 records the two defects found alongside and
not fixed here.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

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