audio/bluez: update device aliases at runtime when renamed

fixes #1628

quickshell/Services/AudioService.qml

@@ -210,6 +210,10 @@ Singleton {
         updated[nodeName] = trimmedAlias;
         deviceAliases = updated;
 
+        const btDevice = BluetoothService.deviceForNodeName(nodeName);
+        if (btDevice)
+            btDevice.name = trimmedAlias;
+
         writeWireplumberConfig();
         deviceAliasChanged(nodeName, trimmedAlias);
         return true;
@@ -226,6 +230,11 @@ Singleton {
         delete updated[nodeName];
         deviceAliases = updated;
 
+        // Empty BlueZ alias write resets to the device's real name.
+        const btDevice = BluetoothService.deviceForNodeName(nodeName);
+        if (btDevice)
+            btDevice.name = "";
+
         writeWireplumberConfig();
         deviceAliasChanged(nodeName, "");
         return true;

quickshell/Services/BluetoothService.qml

@@ -245,6 +245,14 @@ Singleton {
         return `bluez_card.${device.address.replace(/:/g, "_")}`;
     }
 
+    function deviceForNodeName(nodeName) {
+        const match = (nodeName || "").match(/^bluez_(?:output|input|card)\.([0-9A-Fa-f_]+)/);
+        if (!match)
+            return null;
+        const address = match[1].replace(/_/g, ":").toUpperCase();
+        return Bluetooth.devices?.values?.find(d => (d.address || "").toUpperCase() === address) ?? null;
+    }
+
     function getDevicePath(device) {
         if (!device || !device.address) {
             return "";