gui: fix connection history retaining stale counter-based ID

_push_lru ran right after connect, before MON-VER resolves the device
name, so history entries kept the placeholder ID forever. Dedupe LRU
entries by connection endpoint (host/port, serial port, or file path)
instead of by receiver_id, and re-push once the device name is known
so the corrected entry replaces the placeholder instead of duplicating
it.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XM4FNUjhu9x8df5Dp1hHvd

gui/connection_tab.py

@@ -356,3 +356,5 @@ class ConnectionTab(QWidget):
             if row.get_receiver_id() == rid:
                 row.set_version_info(device_id, sw_version)
                 break
+        if device_id:
+            self._refresh_history_combo()

gui/data_model.py

@@ -77,6 +77,13 @@ class ConnectionConfig:
             return f"{self.receiver_id}  [{self.serial_port} @ {self.baud_rate}]"
         return f"{self.receiver_id}  [file: {os.path.basename(self.file_path)}]"
 
+    def endpoint_key(self):
+        if self.conn_type == 'tcp':
+            return ('tcp', self.host, self.port)
+        if self.conn_type == 'serial':
+            return ('serial', self.serial_port, self.baud_rate)
+        return ('file', self.file_path)
+
     def to_dict(self):
         return dataclasses.asdict(self)
 
@@ -135,8 +142,8 @@ class ReceiverManager(QObject):
             pass
 
     def _push_lru(self, config: ConnectionConfig):
-        key = config.display_str()
-        self._lru = [c for c in self._lru if c.display_str() != key]
+        key = config.endpoint_key()
+        self._lru = [c for c in self._lru if c.endpoint_key() != key]
         self._lru.insert(0, config)
         self._lru = self._lru[:LRU_MAX]
         self._save_lru()
@@ -333,3 +340,7 @@ class ReceiverManager(QObject):
         if state:
             state.device_id  = device_id
             state.sw_version = sw_version
+        config = self._configs.get(rid)
+        if config and device_id:
+            config.receiver_id = device_id
+            self._push_lru(config)