Use the radio and wand mockups behind their forms

Draw radio_report/emergency_radio behind a transparent, padded form and switch
the backdrop with the call type. The wand HUD popup now shows wand_screening
behind its text while open. Both covers use the mockup panel bounds so baked-in
controls stay hidden. Headless 226/226 verified in a clean HEAD worktree.

src/game/ui/radio_panel.gd

@@ -8,6 +8,7 @@ signal submitted(report: Dictionary, emergency: bool)
 signal cancelled()
 
 const Rules := preload("res://src/core/rules.gd")
+const UiArt := preload("res://src/game/ui/art.gd")
 
 var panel: PanelContainer
 var npc_name_label: Label
@@ -26,19 +27,32 @@ var _hold_time := 0.0
 const HOLD_NEEDED := 1.6
 var _truth := {"weapons_seen": false, "danger_level": 0}
 
+var _art := UiArt.new()
+var _art_layer: Control = null
+
 func _init() -> void:
 	name = "RadioPanel"
 	layer = 20
-	var dim := ColorRect.new()
-	dim.color = Color(0, 0, 0, 0.55)
-	dim.set_anchors_preset(Control.PRESET_FULL_RECT)
-	add_child(dim)
+	_art_layer = Control.new()
+	_art_layer.name = "RadioArt"
+	_art_layer.set_anchors_preset(Control.PRESET_FULL_RECT)
+	_art_layer.mouse_filter = Control.MOUSE_FILTER_IGNORE
+	add_child(_art_layer)
+	_paint_backdrop()
 
 	var center := CenterContainer.new()
 	center.set_anchors_preset(Control.PRESET_FULL_RECT)
 	center.mouse_filter = Control.MOUSE_FILTER_IGNORE
 	add_child(center)
 	panel = PanelContainer.new()
+	panel.custom_minimum_size = Vector2(560, 0)
+	var panel_style := StyleBoxFlat.new()
+	panel_style.bg_color = Color(0, 0, 0, 0)
+	panel_style.content_margin_left = 28
+	panel_style.content_margin_right = 28
+	panel_style.content_margin_top = 22
+	panel_style.content_margin_bottom = 22
+	panel.add_theme_stylebox_override("panel", panel_style)
 	center.add_child(panel)
 
 	var vbox := VBoxContainer.new()
@@ -99,13 +113,28 @@ func _init() -> void:
 
 var _title_label: Label
 
+func _paint_backdrop() -> void:
+	if _art_layer == null:
+		return
+	for child in _art_layer.get_children():
+		_art_layer.remove_child(child)
+		child.queue_free()
+	var art_name := "emergency_radio" if _emergency else "radio_report"
+	var rect := Rect2(0.120, 0.058, 0.697, 0.882) if _emergency else Rect2(0.176, 0.033, 0.585, 0.923)
+	if not _art.add_screen_backdrop(_art_layer, art_name, rect):
+		var dim := ColorRect.new()
+		dim.color = Color(0, 0, 0, 0.55)
+		dim.set_anchors_preset(Control.PRESET_FULL_RECT)
+		_art_layer.add_child(dim)
+
 func open(controller: Object, emergency: bool, truth: Dictionary) -> void:
 	_emergency = emergency
+	_paint_backdrop()
 	_truth = truth
 	_npc_id = controller.npc_id if controller else ""
 	npc_name_label.text = "Target: %s" % (controller.profile.display_name if controller else "?")
 	var title: Label = panel.find_child("RadioTitle", true, false)
-	title.text = "EMERGENCY CALL" if emergency else "Security Assistance"
+	title.text = "EMERGENCY RADIO" if emergency else "RADIO DISPATCH"
 	weapons_check.button_pressed = truth.get("weapons_seen", false)
 	danger_option.select(truth.get("danger_level", 1))
 	hold_hint.text = "Hold the button for %.1fs" % HOLD_NEEDED if emergency else ""