feat: cel-shaded look & feel overhaul — real audio, comic UI, themed VFX

Audio (all CC0 — Kenney packs + OpenGameArt, see assets/sounds/SOURCES.md):
- Replace every procedural synth WAV with forged sounds (ffmpeg pitch/layer
  mixes): distinct fire sounds per weapon with 2-3 variations, explosions,
  footsteps x5, land/jump/dash/vault, knife swing, hit/kill confirms,
  bullet impacts, reload, flight loops, UI hover/click/confirm/error,
  match jingles, menu music
- AudioManager.stream_for(): AudioStreamRandomizer per sound id — every
  weapon now gets variation + pitch randomization on each shot
- Explosions and bullet impacts play positional audio; landing has its own
  sound instead of a pitched footstep; ambient wind bed on every map

Visuals:
- ExplosionVFX: shared cel-shaded burst (white-hot stepped core, ink
  shockwave ring, star spikes, flat smoke puffs) replaces the orange
  sphere in both local and remote-replay paths
- Comic star muzzle flashes on all weapons; unified cel tracer bolts with
  ink outlines across hitscan/shotgun/remote paths
- Impact decals: hard-stepped ink-splat gradients instead of soft airbrush
- Toon shading on first-person view models + arms, third-person weapons,
  and the procedural humanoid fallback (no hull outlines on FBX weapons —
  their hard normals tear the inverted hull)
- Fix: giant soft "blob" highlight on floors — toon rim/specular disabled
  on level-geometry materials (pre-existing artifact since the cel commit)
- Fix: own third-person weapon rendered into the first-person camera
  (shadows-only now covers first_person_mode)

UI:
- UITheme: comic theme on the root window — Bangers display font (OFL),
  paper panels with thick ink borders + hard drop shadows, papaya accent,
  themed buttons/inputs/popups; hover/click sounds on all menu buttons
- Main menu: tilted comic wordmark, sunset toon diorama, looping menu music
- Match HUD: themed scoreboard/killfeed/kill counter

Viewports:
- 4x MSAA project-wide + viewmodel/diorama viewports (crisp ink lines)
- Viewmodel camera near plane 0.01; third-person camera FOV syncs settings
- debug/visual_capture.gd: dev tool to screenshot menu + level for review

Verified: 11/11 movement tests, spawn smoke test 0 failures, before/after
screenshot comparison of menu and level.

Co-Authored-By: Claude Fable 5 <[email protected]>

movement/player_movement_controller.gd

@@ -36,6 +36,8 @@ var death_screen: Control
 var ragdoll_instance: Node3D
 # Audio
 var footstep_player: AudioStreamPlayer
+var footstep_streams: Array = []
+var land_player: AudioStreamPlayer
 var dash_player: AudioStreamPlayer
 var recent_attackers: Dictionary = {} # attacker_id: timestamp
 var hit_player: AudioStreamPlayer
@@ -182,6 +184,7 @@ func set_third_person(on: bool) -> void:
 		return
 	third_person = on
 	if is_instance_valid(_tp_camera):
+		_tp_camera.fov = SettingsManager.world_fov # stay in sync with settings
 		_tp_camera.current = on
 	if is_instance_valid(camera):
 		camera.current = not on
@@ -250,8 +253,18 @@ func _hide_remote_weapons() -> void:
 func _setup_audio() -> void:
 	footstep_player = AudioStreamPlayer.new()
 	footstep_player.bus = "SFX"
-	footstep_player.stream = load("res://assets/sounds/footstep.wav")
+	for path in ["res://assets/sounds/footstep.wav", "res://assets/sounds/footstep_01.wav",
+			"res://assets/sounds/footstep_02.wav", "res://assets/sounds/footstep_03.wav",
+			"res://assets/sounds/footstep_04.wav"]:
+		if ResourceLoader.exists(path):
+			footstep_streams.append(load(path))
+	footstep_player.stream = footstep_streams[0] if not footstep_streams.is_empty() else null
 	add_child(footstep_player)
+
+	land_player = AudioStreamPlayer.new()
+	land_player.bus = "SFX"
+	land_player.stream = load("res://assets/sounds/land.wav")
+	add_child(land_player)
 	
 	jump_player = AudioStreamPlayer.new()
 	jump_player.bus = "SFX"
@@ -492,34 +505,7 @@ func rpc_play_fire_effects(origin: Vector3, target_or_dir: Vector3, _weapon_name
 		_spawn_remote_projectile(origin, target_or_dir, _weapon_name)
 
 func _spawn_remote_tracer(origin: Vector3, target: Vector3) -> void:
-	var tracer = Node3D.new()
-	tracer.set_script(load("res://weapons/hitscan_tracer.gd"))
-	
-	var t_mesh_inst = MeshInstance3D.new()
-	var t_mesh = CapsuleMesh.new()
-	t_mesh.radius = 0.02
-	t_mesh.height = 1.0
-	var t_mat = StandardMaterial3D.new()
-	t_mat.albedo_color = Color(1.0, 0.8, 0.2)
-	t_mat.emission_enabled = true
-	t_mat.emission = Color(2.0, 1.5, 0.5)
-	t_mesh.material = t_mat
-	
-	t_mesh_inst.mesh = t_mesh
-	t_mesh_inst.rotation.x = deg_to_rad(90)
-	t_mesh_inst.position = Vector3(0, 0, -0.5)
-	tracer.add_child(t_mesh_inst)
-	
-	tracer.target_position = target
-	
-	if origin.distance_squared_to(target) > 0.1:
-		get_tree().current_scene.add_child(tracer)
-		tracer.global_position = origin
-		
-		var up_vec = Vector3.UP
-		if abs((target - origin).normalized().dot(up_vec)) > 0.99:
-			up_vec = Vector3.RIGHT
-		tracer.look_at(target, up_vec)
+	HitscanTracer.spawn_bolt(get_tree().current_scene, origin, target)
 
 func _spawn_remote_projectile(origin: Vector3, fire_dir: Vector3, weapon_name: String) -> void:
 	# Try to find the actual weapon to spawn its custom projectile so it looks identical!
@@ -620,36 +606,7 @@ func server_play_explosion(pos: Vector3, radius: float) -> void:
 func rpc_play_explosion(pos: Vector3, radius: float) -> void:
 	if is_multiplayer_authority(): return
 	
-	var visual = MeshInstance3D.new()
-	var s_mesh = SphereMesh.new()
-	s_mesh.radius = radius
-	s_mesh.height = radius * 2.0
-	visual.mesh = s_mesh
-	
-	var mat = StandardMaterial3D.new()
-	mat.albedo_color = Color(1.0, 0.5, 0.0, 0.6) # Translucent orange
-	mat.transparency = BaseMaterial3D.TRANSPARENCY_ALPHA
-	mat.emission_enabled = true
-	mat.emission = Color(1.0, 0.3, 0.0)
-	visual.material_override = mat
-	
-	visual.position = pos
-	get_tree().current_scene.add_child(visual)
-	
-	var tween = visual.create_tween()
-	tween.tween_property(mat, "albedo_color:a", 0.0, 0.3)
-	tween.parallel().tween_property(visual, "scale", Vector3(1.1, 1.1, 1.1), 0.3)
-	tween.tween_callback(visual.queue_free)
-	
-	var audio = AudioStreamPlayer3D.new()
-	audio.stream = load("res://assets/sounds/shotgun_fire.wav")
-	audio.bus = "SFX"
-	audio.pitch_scale = 0.7
-	audio.max_distance = 150.0
-	get_tree().current_scene.add_child(audio)
-	audio.global_position = pos
-	audio.play()
-	audio.finished.connect(audio.queue_free)
+	ExplosionVFX.spawn(get_tree(), pos, radius)
 
 @rpc("any_peer", "call_local", "reliable")
 func server_take_damage(amount: float, hit_pos: Vector3, attacker_id: int, weapon_name: String, impulse: Vector3) -> void:
@@ -973,13 +930,11 @@ func _on_movement_event(ev: String, data: Dictionary) -> void:
 	elif ev == "dash":
 		_speedline_burst = 1.0
 	elif ev == "land":
-		# Landing thud: reuse the footstep sample, pitched down and louder
-		# with impact. Ground state resets pitch/volume before each step.
-		if footstep_player:
+		if land_player:
 			var heavy: bool = data.get("heavy", false)
-			footstep_player.pitch_scale = 0.55 if heavy else 0.7
-			footstep_player.volume_db = 2.0 if heavy else -2.0
-			footstep_player.play()
+			land_player.pitch_scale = (0.8 if heavy else 1.0) * randf_range(0.95, 1.05)
+			land_player.volume_db = 2.0 if heavy else -3.0
+			land_player.play()
 
 func _process(delta: float) -> void:
 	# Remote players: interpolate toward the owner's synced transform and

movement/states/state_ground.gd

@@ -82,8 +82,9 @@ func update(delta: float) -> void:
 		_footstep_timer -= delta
 		if _footstep_timer <= 0.0:
 			if player.footstep_player:
-				# Reset pitch/volume (the landing thud reuses this player) and
-				# add slight variation so steps don't machine-gun.
+				# Random sample + slight pitch variation so steps don't machine-gun.
+				if "footstep_streams" in player and not player.footstep_streams.is_empty():
+					player.footstep_player.stream = player.footstep_streams.pick_random()
 				player.footstep_player.pitch_scale = randf_range(0.92, 1.08)
 				player.footstep_player.volume_db = -6.0
 				player.footstep_player.play()