Update audio pipeline with extensive logging and defualt with fallbacks

tests/test_audio.cpp

@@ -8,6 +8,7 @@ TEST(AudioTest, FriendlyDeviceNameMapping) {
     EXPECT_EQ(mapToFriendlyDeviceName("AMD Radeon HD Audio Controller HDMI"), "TV / HDMI Monitor");
     EXPECT_EQ(mapToFriendlyDeviceName("USB Audio Headset Dongle"), "USB Audio Device");
     EXPECT_EQ(mapToFriendlyDeviceName("bluez_sink.00_11_22_33_44_55"), "Bluetooth Audio");
+    EXPECT_EQ(mapToFriendlyDeviceName("Virtual Speaker"), "Built-In Speakers");
     EXPECT_EQ(mapToFriendlyDeviceName(""), "Default Audio Output");
 }
 
@@ -30,6 +31,7 @@ TEST(AudioTest, GetPlaybackDevicesFallsBackWithIdZeroWhenNone) {
     for (const auto& d : devices) {
         if (d.raw_name.empty()) {
             EXPECT_EQ(d.id, 0u);
+            EXPECT_EQ(d.friendly_name, "System Default");
         }
     }
 }