fix(companion): arm the "Relayed by" tracker for bot-originated channel posts

Remote Bot's channel trigger reply, channel command reply, and !gps fix
result all mirrored their send into the on-device history with
addOwnChannelMsg() but never called armChannelRelay() afterward, unlike
the app's CMD_SEND_CHANNEL_TXT_MSG send which already did both -- so a
bot's own channel posts never showed which repeaters echoed them back,
while everything else did.

Factor the always-together pair (mirror into history, then arm relay
tracking from the send sendGroupMessage's sendFloodScoped already
tracked) into MyMesh::mirrorOwnChannelMsg(), and route all four call
sites through it instead of pairing the two calls by hand -- the bot
bug was exactly a dropped second call, so a new call site can no longer
add the first half without the second.

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

examples/companion_radio/MyMesh.cpp

@@ -2039,19 +2039,11 @@ void MyMesh::handleCmdFrame(size_t len) {
         // so it must never bump the channel's unread badge even though the
         // device's own UI isn't necessarily showing this channel right now
         // (unlike an on-device compose, which is always looking at the
-        // channel it just sent to).
-        if (_ui) {
-          int tlen = len - i;
-          if (tlen > MAX_TEXT_LEN) tlen = MAX_TEXT_LEN;
-          int pos = _ui->addOwnChannelMsg(channel_idx, text, tlen, msg_timestamp);
-          // Same "relayed into mesh" marker an on-device channel send arms (see
-          // MessagesScreen::afterSend): sendGroupMessage above already went
-          // through sendFloodScoped(GroupChannel&, ...), which calls
-          // trackRelaySend() unconditionally, so lastChannelRelaySeq() is
-          // already the seq for the send that was just made -- this just
-          // attaches it to the matching history entry.
-          if (pos >= 0) _ui->armChannelRelay(pos, lastChannelRelaySeq());
-        }
+        // channel it just sent to). mirrorOwnChannelMsg also arms the
+        // "Relayed by" tracker on the new entry -- see its own comment.
+        int tlen = len - i;
+        if (tlen > MAX_TEXT_LEN) tlen = MAX_TEXT_LEN;
+        mirrorOwnChannelMsg(channel_idx, text, tlen, msg_timestamp);
 #endif
       } else {
         writeErrFrame(ERR_CODE_NOT_FOUND); // bad channel_idx

examples/companion_radio/MyMesh.h

@@ -228,6 +228,22 @@ public:
   // Seq of the most recently tracked channel send — the UI records it on the
   // outgoing history entry so a heard echo (onChannelRelayed) can match it back.
   uint32_t lastChannelRelaySeq() const { return _last_relay_seq; }
+
+  // Mirror a channel post this device just originated (sendGroupMessage
+  // already succeeded) into the on-device history AND arm its "Relayed by"
+  // tracker in one call -- every caller (CMD_SEND_CHANNEL_TXT_MSG, the three
+  // Remote Bot reply/command/locfix paths) needs both, always in this order,
+  // and a caller that adds the history entry without arming the tracker
+  // right after (an easy line to forget) silently never shows repeater
+  // confirmations for that message. sendGroupMessage's sendFloodScoped(
+  // GroupChannel&, ...) already calls trackRelaySend() unconditionally, so
+  // lastChannelRelaySeq() is already the seq for the send just made.
+  int mirrorOwnChannelMsg(uint8_t channel_idx, const char* text, int text_len = -1, uint32_t timestamp = 0) {
+    if (!_ui) return -1;
+    int pos = _ui->addOwnChannelMsg(channel_idx, text, text_len, timestamp);
+    if (pos >= 0) _ui->armChannelRelay(pos, lastChannelRelaySeq());
+    return pos;
+  }
 private:
 
   // DataStoreHost methods

examples/companion_radio/MyMeshBot.h

@@ -199,7 +199,7 @@ void MyMesh::tryBotReplyChannel(uint8_t channel_idx, const char* text, uint8_t h
     _bot_last_ch_reply_ms = millis();
     _bot_reply_count++;
 #ifdef DISPLAY_CLASS
-    if (_ui) _ui->addOwnChannelMsg(channel_idx, expanded);
+    mirrorOwnChannelMsg(channel_idx, expanded);
 #endif
   }
 }
@@ -492,7 +492,7 @@ bool MyMesh::tryBotChannelCommand(uint8_t channel_idx, const char* text, uint8_t
     _bot_last_ch_reply_ms = millis();
     _bot_reply_count++;
 #ifdef DISPLAY_CLASS
-    if (_ui) _ui->addOwnChannelMsg(channel_idx, out);
+    mirrorOwnChannelMsg(channel_idx, out);
 #endif
     if (_locfix_requested) startLocFix(LOCFIX_DEST_CHANNEL, nullptr, channel_idx);
     applyPendingBotActions();
@@ -647,7 +647,7 @@ void MyMesh::sendLocFixResult(const char* msg) {
       _bot_last_ch_reply_ms = millis();
       _bot_reply_count++;
 #ifdef DISPLAY_CLASS
-      if (_ui) _ui->addOwnChannelMsg(_loc_fix.channel_idx, msg);
+      mirrorOwnChannelMsg(_loc_fix.channel_idx, msg);
 #endif
     }
   } else {   // LOCFIX_DEST_CONTACT -- DM or room, both go through sendMessage