Zaps in chat, and a bolt + sats tally on chat messages, DMs and posts.

Chat and DM message sheets grow a ⚡ Zap item (not on your own messages),
riding the same one-tap flow as a post zap — Ark first, Lightning fallback,
the amount remembered from the first time. A chat message is a rumor with an
id like any event, so the zap e-tags that id; the public receipt reveals
nothing but the id.

Every post row, chat bubble and DM shows how much it's been zapped as a
little amber bolt + sats chip (1.2k / 21k / 1.5M), fed by the public receipts
that e-tag it: NIP-57 kind 9735 (amount from the bolt11, the zap request's
amount as fallback) and coinos' own Ark receipt, kind 9737 (network-checked).
Summed per id, deduped by receipt; underlined when one of ours is in it.
Ids are asked once each (batched per paint, 150 per REQ), and ONE live
subscription follows the ~200 ids most recently on screen so a zap landing
while you watch — yours included, rechecked at 4/12/30s — shows up without
a reload. The tally chip is itself a zap button on others' messages.

Co-Authored-By: Claude Fable 5.1 <[email protected]>
Claude-Session: https://claude.ai/code/session_01URmfo8VimCNkw6Y7JndYrv

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