Inbound Meshtastic text addressed to BROADCAST_NUM (the default public
LongFast channel, or any channel slot) was filed into a per-sender 1:1 DM
thread, so public-channel messages polluted individual people's DM chats
and appeared as if sent directly to the user.
packet_to_inbound_frame now detects `to == BROADCAST_NUM` and emits a new
synthetic RESP_MESHTASTIC_CHANNEL_TEXT frame
([channel_idx][sender_prefix(6)][text]) that the listener files under the
channel thread (contact_id = u32::MAX - idx) while still attributing the
message to its real sender. Directed text (to == our node) still routes to
the DM thread — a regression test locks that split in.
send_channel_text now sets MeshPacket.channel (field 3) so archy actually
transmits on channel 0 (public) instead of ignoring the slot. Mesh.vue keeps
the synthetic "Meshtastic !xxxx" sender id when that is the best identity
available for a stock public-channel device.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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