[fix](trx-rs): use per-message rig_id for map marker tagging

The map module was tagging all decode markers (APRS, AIS, VDES,
FT8/FT4/FT2/WSPR locators) with the global rig picker's active rig
instead of the actual source rig. This made the map's own rig filter
dropdown ineffective in multi-rig setups.

- Add rig_id field to all decode message structs (AisMessage,
  VdesMessage, AprsPacket, CwEvent, Ft8Message, WsprMessage)
- Set rig_id on messages in audio_client before broadcasting, using
  the actual rig connection identifier
- Update history collector to prefer message rig_id over the global
  active rig fallback
- Pass rig_id through plugin normalize functions (AIS, APRS, VDES,
  HF-APRS) so it reaches the map add functions
- Update all map marker functions (aprsMapAddStation, aisMapAddVessel,
  vdesMapAddPoint, mapAddLocator) to use the message's rig_id with
  fallback to the global picker for backward compatibility

https://claude.ai/code/session_015gC7axHk2jmp7HbFPdbivN
Signed-off-by: Claude <noreply@anthropic.com>

src/decoders/trx-ais/src/lib.rs

@@ -230,6 +230,7 @@ fn parse_frame(frame: RawFrame, channel: &str) -> Option<AisMessage> {
     let mmsi = get_uint(&bits, 8, 30)? as u32;
 
     let mut msg = AisMessage {
+        rig_id: None,
         ts_ms: None,
         channel: channel.to_string(),
         message_type,

src/decoders/trx-aprs/src/lib.rs

@@ -413,6 +413,7 @@ fn parse_aprs(ax25: &Ax25Frame) -> AprsPacket {
     }
 
     AprsPacket {
+        rig_id: None,
         ts_ms: None,
         src_call,
         dest_call,

src/decoders/trx-cw/src/lib.rs

@@ -399,6 +399,7 @@ impl CwDecoder {
 
     fn emit_event(&mut self, text: &str) {
         self.events.push(CwEvent {
+            rig_id: None,
             text: text.to_string(),
             wpm: self.wpm,
             tone_hz: self.tone_freq,

src/decoders/trx-vdes/src/lib.rs

@@ -226,6 +226,7 @@ impl VdesDecoder {
         });
 
         Some(VdesMessage {
+            rig_id: None,
             ts_ms: None,
             channel: channel.to_string(),
             message_type: parsed.message_id.unwrap_or(mode.message_type),
@@ -421,6 +422,7 @@ fn build_unsynced_message(
     let raw_bytes = pack_dibits_msb(raw_symbols);
     let sync_pct = framed.sync_score * 100.0;
     VdesMessage {
+        rig_id: None,
         ts_ms: None,
         channel: channel.to_string(),
         message_type: mode.message_type,