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d064a617e0
Channels have no recipient ACK, so true delivery can't be shown. Instead reuse
the heard-repeater-echo idea (same as APC's flood feedback) to mark an outgoing
channel message ✓ once a repeater rebroadcast of it is heard — i.e. it was
relayed into the mesh. No echo is NOT a failure (direct/0-hop neighbours never
echo), so unconfirmed sends simply show no marker.
- MyMesh: single-slot relay tracker independent of APC (trackRelaySend on every
channel flood; hash-match in filterRecvFloodPacket gated on _relay_pending so
the hot recv path is untouched otherwise; window expiry in loop just drops it).
lastChannelRelaySeq() hands the seq to the UI.
- AbstractUITask::onChannelRelayed() -> UITask -> QuickMsgScreen::markChannelRelayed().
- ChHistEntry gains relay_status / relay_seq; afterSend arms the marker on the
exact stored entry; render shows ✓ only on ACK_OK for our own ("Me:") rows.
Verified: GAT562 (SSD1306) and WioTrackerL1Eink (GxEPD) solo builds compile clean.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>