Two bugs made clicking the channel name in the video modal just close the player:
- the second PlayerModal mount (main feed path) was missing onOpenChannel, so the handler
hit its no-op early return;
- opening the channel synchronously pushed the _chan history entry, which the player's own
useBackToClose teardown (history.back on unmount) then immediately popped. Now the open is
deferred to a one-shot popstate listener that fires AFTER that teardown, so the channel
entry lands at the feed level. Verified: player → channel name → channel page; Back → feed
(player does not reappear).