feat(cockpit): replace procedural cockpit with twelve scripted models

Instance twelve Blender-scripted glTF models in the cockpit scene and
rebuild the cabin around them: gauge panel, sonar, switch panel, alert
box, speaker, porthole, hull wall, caged lamps, gas bottle, handrails
and side consoles. Presentation only; no domain, application or world
rule changes beyond enabling glow in the test environment.

- Needles, alert lamps and sonar screen are driven by the existing
  snapshots; the alert box now carries SYS/ATTN/ALRM.
- Depth dial reads percent of certified depth.
- Sonar display restyled as a turquoise holographic relief with a
  shader grid and height scale; SubViewport matches the glass (960x604).
- Cabin lighting retuned: warm pooled lamp light, cool porthole rim,
  lamp shadows, dial backlight.
- Procedural stand-ins removed (bulkhead, tanks, consoles, levers,
  indicator columns, placeholder pipe run, dial face PNGs).
- Tests adapted where nodes disappeared; one assertion removed
  (pipe_segment_count) until the pipe kit is placed.
- Model .glb files are committed without LFS; textures Godot extracts
  next to them at import are ignored.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

game/presentation/sonar/sonar_relief_renderer.gd

@@ -5,15 +5,32 @@ const SonarScan = preload("res://game/domain/sonar/sonar_scan.gd")
 const SonarReliefMeshBuilder = preload(
 	"res://game/presentation/sonar/sonar_relief_mesh_builder.gd"
 )
+const SonarReliefStyle = preload("res://game/presentation/sonar/sonar_relief_style.gd")
+
+## Matches the glass of the cockpit sonar monitor (0.690 × 0.434, ratio 1.59).
+const RENDER_SIZE := Vector2i(960, 604)
+## Ground width framed by the orthographic camera, independent of the ratio.
+const VIEW_WIDTH_M := 178.0
+## Table-like oblique view from behind the vehicle. The aim point sits right
+## of the scan axis so the relief leaves the right edge to the height scale.
+const CAMERA_AIM_POINT := Vector3(14.0, -46.0, 50.0)
+const CAMERA_ELEVATION_DEGREES := 44.0
+const CAMERA_DISTANCE_M := 120.0
+const IDLE_PROMPT_SIZE := Vector2(600.0, 64.0)
+## Height scale drawn at the right edge of the screen, in viewport pixels.
+const SCALE_BAR_RECT := Rect2(920.0, 70.0, 12.0, 464.0)
+const SCALE_TICK_COUNT := 3
+const SCALE_LABEL_SIZE := Vector2(112.0, 40.0)
+const SCALE_FONT_SIZE := 34
 
 var _current_mesh_instance: MeshInstance3D
-var _current_grid_instance: MeshInstance3D
 var _previous_mesh_instance: MeshInstance3D
 var _contact_root: Node3D
 var _idle_prompt: Label
-var _current_material: StandardMaterial3D
-var _grid_material: StandardMaterial3D
-var _previous_material: StandardMaterial3D
+var _current_material: ShaderMaterial
+var _previous_material: ShaderMaterial
+var _depth_scale: TextureRect
+var _scale_labels: Array[Label] = []
 var _current_scan_id: StringName = &""
 var _previous_scan_id: StringName = &""
 var _built_current_rows := 0
@@ -22,9 +39,8 @@ var _built_current_grid_segment_count := 0
 
 
 func _ready() -> void:
-	size = Vector2i(960, 540)
+	size = RENDER_SIZE
 	render_target_update_mode = SubViewport.UPDATE_ALWAYS
-	positional_shadow_atlas_size = 1024
 	own_world_3d = true
 	_build_render_world()
 
@@ -41,11 +57,11 @@ func present(
 	if current_scan.scan_id != _current_scan_id:
 		_current_scan_id = current_scan.scan_id
 		_current_mesh_instance.mesh = ArrayMesh.new()
-		_current_grid_instance.mesh = ArrayMesh.new()
 		_built_current_rows = 0
 		_built_current_triangle_count = 0
 		_built_current_grid_segment_count = 0
 		_rebuild_contacts(current_scan)
+		_update_depth_scale(current_scan)
 	_build_current_rows(current_scan, clampi(visible_rows, 0, current_scan.samples.rows))
 	_update_contact_visibility(current_scan, visible_rows)
 
@@ -61,7 +77,7 @@ func present(
 				previous_scan,
 				_previous_material
 			)
-		_previous_material.albedo_color.a = clampf(previous_opacity, 0.0, 1.0)
+		SonarReliefStyle.set_opacity(_previous_material, previous_opacity)
 
 
 func render_texture() -> Texture2D:
@@ -84,6 +100,16 @@ func idle_prompt_visible() -> bool:
 	return _idle_prompt != null and _idle_prompt.visible
 
 
+## Elevation labels of the height scale, top (highest) to bottom; empty until
+## a scan has been presented.
+func depth_scale_texts() -> PackedStringArray:
+	var texts := PackedStringArray()
+	if _depth_scale != null and _depth_scale.visible:
+		for label: Label in _scale_labels:
+			texts.append(label.text)
+	return texts
+
+
 func visible_contact_count() -> int:
 	var count := 0
 	for child: Node in _contact_root.get_children():
@@ -96,24 +122,17 @@ func _build_render_world() -> void:
 	var environment_node := WorldEnvironment.new()
 	var environment := Environment.new()
 	environment.background_mode = Environment.BG_COLOR
-	environment.background_color = Color("020407")
-	environment.ambient_light_source = Environment.AMBIENT_SOURCE_COLOR
-	environment.ambient_light_color = Color(0.18, 0.31, 0.34)
-	environment.ambient_light_energy = 0.42
+	environment.background_color = SonarReliefStyle.COLOR_BACKGROUND
+	environment.ambient_light_source = Environment.AMBIENT_SOURCE_DISABLED
 	environment_node.environment = environment
 	add_child(environment_node)
 
-	_current_material = _relief_material(false)
-	_grid_material = _surface_grid_material()
-	_previous_material = _relief_material(true)
+	_current_material = SonarReliefStyle.relief_material(false)
+	_previous_material = SonarReliefStyle.relief_material(true)
 	_current_mesh_instance = MeshInstance3D.new()
 	_current_mesh_instance.name = "CurrentRelief"
 	_current_mesh_instance.mesh = ArrayMesh.new()
 	add_child(_current_mesh_instance)
-	_current_grid_instance = MeshInstance3D.new()
-	_current_grid_instance.name = "CurrentReliefGrid"
-	_current_grid_instance.mesh = ArrayMesh.new()
-	add_child(_current_grid_instance)
 	_previous_mesh_instance = MeshInstance3D.new()
 	_previous_mesh_instance.name = "PreviousRelief"
 	_previous_mesh_instance.mesh = ArrayMesh.new()
@@ -128,72 +147,88 @@ func _build_render_world() -> void:
 	var camera := Camera3D.new()
 	camera.name = "SonarCamera"
 	camera.projection = Camera3D.PROJECTION_ORTHOGONAL
-	camera.size = 116.0
+	camera.keep_aspect = Camera3D.KEEP_WIDTH
+	camera.size = VIEW_WIDTH_M
 	camera.far = 240.0
-	camera.position = Vector3(0.0, 65.0, -30.0)
+	var elevation := deg_to_rad(CAMERA_ELEVATION_DEGREES)
+	camera.position = CAMERA_AIM_POINT + CAMERA_DISTANCE_M * Vector3(
+		0.0, sin(elevation), -cos(elevation)
+	)
 	add_child(camera)
-	camera.look_at(Vector3(0.0, -38.0, 58.0), Vector3.UP)
+	camera.look_at(CAMERA_AIM_POINT, Vector3.UP)
 	camera.current = true
 
-	var key_light := DirectionalLight3D.new()
-	key_light.rotation_degrees = Vector3(-52.0, -28.0, 0.0)
-	key_light.light_energy = 1.25
-	key_light.shadow_enabled = true
-	add_child(key_light)
-	var fill_light := DirectionalLight3D.new()
-	fill_light.rotation_degrees = Vector3(-28.0, 145.0, 18.0)
-	fill_light.light_energy = 0.38
-	add_child(fill_light)
+	_build_depth_scale()
 	_build_idle_prompt()
 
 
 func _build_idle_prompt() -> void:
 	_idle_prompt = Label.new()
 	_idle_prompt.name = "IdlePrompt"
-	_idle_prompt.position = Vector2(180.0, 238.0)
-	_idle_prompt.size = Vector2(600.0, 64.0)
+	_idle_prompt.position = (Vector2(RENDER_SIZE) - IDLE_PROMPT_SIZE) * 0.5
+	_idle_prompt.size = IDLE_PROMPT_SIZE
 	_idle_prompt.text = "SONAR PRÊT · F POUR ÉMETTRE"
 	_idle_prompt.horizontal_alignment = HORIZONTAL_ALIGNMENT_CENTER
 	_idle_prompt.vertical_alignment = VERTICAL_ALIGNMENT_CENTER
 	_idle_prompt.add_theme_font_size_override("font_size", 26)
-	_idle_prompt.add_theme_color_override("font_color", Color(0.38, 0.88, 0.86))
+	_idle_prompt.add_theme_color_override("font_color", SonarReliefStyle.COLOR_MIDDLE)
 	_idle_prompt.add_theme_color_override("font_outline_color", Color(0.0, 0.04, 0.05))
 	_idle_prompt.add_theme_constant_override("outline_size", 6)
 	add_child(_idle_prompt)
 
 
-func _relief_material(transparent: bool) -> StandardMaterial3D:
-	var material := StandardMaterial3D.new()
-	material.vertex_color_use_as_albedo = true
-	material.shading_mode = BaseMaterial3D.SHADING_MODE_UNSHADED
-	material.cull_mode = BaseMaterial3D.CULL_DISABLED
-	if transparent:
-		material.transparency = BaseMaterial3D.TRANSPARENCY_ALPHA
-		material.albedo_color = Color(1.0, 1.0, 1.0, 0.0)
-	return material
+## Height legend: the relief palette is relative to the scan, so the bar shows
+## the real elevations of its two ends and of the steps in between.
+func _build_depth_scale() -> void:
+	var gradient := GradientTexture2D.new()
+	gradient.gradient = SonarReliefStyle.height_gradient()
+	gradient.fill_from = Vector2(0.0, 1.0)
+	gradient.fill_to = Vector2(0.0, 0.0)
+	gradient.width = int(SCALE_BAR_RECT.size.x)
+	gradient.height = int(SCALE_BAR_RECT.size.y)
+	_depth_scale = TextureRect.new()
+	_depth_scale.name = "DepthScale"
+	_depth_scale.texture = gradient
+	_depth_scale.position = SCALE_BAR_RECT.position
+	_depth_scale.size = SCALE_BAR_RECT.size
+	_depth_scale.visible = false
+	add_child(_depth_scale)
+	for tick in SCALE_TICK_COUNT:
+		var label := Label.new()
+		label.size = SCALE_LABEL_SIZE
+		label.position = Vector2(
+			-label.size.x - 8.0,
+			SCALE_BAR_RECT.size.y * tick / float(SCALE_TICK_COUNT - 1) - label.size.y * 0.5
+		)
+		label.horizontal_alignment = HORIZONTAL_ALIGNMENT_RIGHT
+		label.vertical_alignment = VERTICAL_ALIGNMENT_CENTER
+		label.add_theme_font_size_override("font_size", SCALE_FONT_SIZE)
+		label.add_theme_color_override("font_color", SonarReliefStyle.COLOR_MIDDLE)
+		_depth_scale.add_child(label)
+		_scale_labels.append(label)
 
 
-func _surface_grid_material() -> StandardMaterial3D:
-	var material := StandardMaterial3D.new()
-	material.shading_mode = BaseMaterial3D.SHADING_MODE_UNSHADED
-	material.transparency = BaseMaterial3D.TRANSPARENCY_ALPHA
-	material.albedo_color = Color(0.32, 0.95, 0.91, 0.34)
-	material.emission_enabled = true
-	material.emission = Color(0.18, 0.78, 0.76)
-	material.emission_energy_multiplier = 1.35
-	return material
+func _update_depth_scale(scan: SonarScan) -> void:
+	for tick in _scale_labels.size():
+		var elevation := lerpf(
+			scan.maximum_elevation_m,
+			scan.minimum_elevation_m,
+			tick / float(_scale_labels.size() - 1)
+		)
+		_scale_labels[tick].text = "%.0f m" % elevation
+	_depth_scale.visible = true
 
 
 func _build_current_rows(scan: SonarScan, visible_rows: int) -> void:
 	var mesh := _current_mesh_instance.mesh as ArrayMesh
-	var grid_mesh := _current_grid_instance.mesh as ArrayMesh
 	while _built_current_rows < visible_rows:
 		if _built_current_rows > 0:
-			_built_current_triangle_count += SonarReliefMeshBuilder.add_row_band(
+			var triangles := SonarReliefMeshBuilder.add_row_band(
 				mesh, scan, _built_current_rows, _current_material
 			)
-			_built_current_grid_segment_count += SonarReliefMeshBuilder.add_grid_band(
-				grid_mesh, scan, _built_current_rows, _grid_material
+			_built_current_triangle_count += triangles
+			_built_current_grid_segment_count += (
+				triangles / 2 * SonarReliefMeshBuilder.GRID_SEGMENTS_PER_CELL
 			)
 		_built_current_rows += 1
 
@@ -210,13 +245,9 @@ func _rebuild_contacts(scan: SonarScan) -> void:
 		marker.position = contact.center_m + Vector3.UP * 1.4
 		marker.visible = false
 		marker.set_meta("forward_distance_m", contact.center_m.z)
-		var material := StandardMaterial3D.new()
-		material.shading_mode = BaseMaterial3D.SHADING_MODE_UNSHADED
-		material.albedo_color = SonarReliefMeshBuilder.COLOR_METAL
-		material.emission_enabled = true
-		material.emission = SonarReliefMeshBuilder.COLOR_METAL
-		material.emission_energy_multiplier = 4.0
-		marker.material_override = material
+		marker.material_override = SonarReliefStyle.marker_material(
+			SonarReliefStyle.COLOR_METAL
+		)
 		_contact_root.add_child(marker)
 
 
@@ -244,11 +275,7 @@ func _add_submarine_marker() -> void:
 	box.size = Vector3(3.2, 1.1, 5.8)
 	marker.mesh = box
 	marker.position = Vector3(0.0, 0.0, 1.0)
-	var material := StandardMaterial3D.new()
-	material.shading_mode = BaseMaterial3D.SHADING_MODE_UNSHADED
-	material.albedo_color = Color.WHITE
-	material.emission_enabled = true
-	material.emission = Color.WHITE
-	material.emission_energy_multiplier = 2.4
-	marker.material_override = material
+	marker.material_override = SonarReliefStyle.marker_material(
+		SonarReliefStyle.COLOR_VEHICLE
+	)
 	add_child(marker)