feat: implement MusicManager singleton and integrate background music into lobby scene

assets/sounds/arena_bg_music.wav.import

@@ -1,24 +0,0 @@
-[remap]
-
-importer="wav"
-type="AudioStreamWAV"
-uid="uid://du6b246jhn0tj"
-path="res://.godot/imported/arena_bg_music.wav-12fe73cd56e22aeda5761a2108eff1b3.sample"
-
-[deps]
-
-source_file="res://assets/sounds/arena_bg_music.wav"
-dest_files=["res://.godot/imported/arena_bg_music.wav-12fe73cd56e22aeda5761a2108eff1b3.sample"]
-
-[params]
-
-force/8_bit=false
-force/mono=false
-force/max_rate=false
-force/max_rate_hz=44100
-edit/trim=false
-edit/normalize=false
-edit/loop_mode=0
-edit/loop_begin=0
-edit/loop_end=-1
-compress/mode=2

assets/sounds/default_bg.wav.import

@@ -0,0 +1,24 @@
+[remap]
+
+importer="wav"
+type="AudioStreamWAV"
+uid="uid://crkiqt7sr6kar"
+path="res://.godot/imported/default_bg.wav-839b907576844c120319a9c7e4b45fb3.sample"
+
+[deps]
+
+source_file="res://assets/sounds/default_bg.wav"
+dest_files=["res://.godot/imported/default_bg.wav-839b907576844c120319a9c7e4b45fb3.sample"]
+
+[params]
+
+force/8_bit=false
+force/mono=false
+force/max_rate=false
+force/max_rate_hz=44100
+edit/trim=false
+edit/normalize=false
+edit/loop_mode=0
+edit/loop_begin=0
+edit/loop_end=-1
+compress/mode=2

assets/sounds/level_bridge.wav.import

@@ -0,0 +1,24 @@
+[remap]
+
+importer="wav"
+type="AudioStreamWAV"
+uid="uid://cvmjyk2fahm1j"
+path="res://.godot/imported/level_bridge.wav-dbed4a154c1ff2dc59be89f0c47534d7.sample"
+
+[deps]
+
+source_file="res://assets/sounds/level_bridge.wav"
+dest_files=["res://.godot/imported/level_bridge.wav-dbed4a154c1ff2dc59be89f0c47534d7.sample"]
+
+[params]
+
+force/8_bit=false
+force/mono=false
+force/max_rate=false
+force/max_rate_hz=44100
+edit/trim=false
+edit/normalize=false
+edit/loop_mode=0
+edit/loop_begin=0
+edit/loop_end=-1
+compress/mode=2

scenes/lobby.gd

@@ -102,8 +102,8 @@ var _bot_names: Dictionary = {}
 # var server_ip_input: LineEdit
 
 func _ready():
-	# Stop background music when in Lobby
-	MusicManager.stop_music()
+	# Start background music for Lobby
+	MusicManager.start_music()
 	
 	# Load character textures
 	_load_character_textures()

scripts/managers/music_manager.gd

@@ -48,7 +48,7 @@ func start_music():
 		"Stop n Go":
 			track_path = "res://assets/sounds/stop_n_go.wav"
 		"Freemode", "Tekton Doors", _:
-			track_path = "res://assets/sounds/freemode.wav"
+			track_path = "res://assets/sounds/level_bridge.wav"
 	
 	play_track(track_path)
 
@@ -104,4 +104,5 @@ func _on_music_finished():
 	print("[MusicManager] Track finished: ", current_track)
 	# Fallback looping if for some reason the native loop didn't work
 	if current_track != "":
-		print("[MusicManag
+		print("[MusicManager] Restarting track (manual loop fallback): ", current_track)
+		music_player.play()