Sharpen upgrades, mark the convoy's destination, and give the world sound

#204 the Beam Collimator widens the beam instead of adding range to one that
already crosses the screen; beam width becomes a per-shot vessel stat.
#205 the Energy Propulser gains three upgrades - dash recharge, dash reach,
and boosted-cruise drain - which turns three constants into vessel stats.
#206 three further doctrines carry the fleet from ten to twenty.
#207 the prologue's World Ship gets a marker, through the scanner's own
guidance arrow rather than a second one.
#208 #210 #213 #214 four new synthesised sounds: the breach opening, cargo
reaching the hold, a rock breaking, and a gas bomb blooming.
#215 building health bars are larger, plated and framed.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019AJMdB7iuHuLFZM1aBu3GD

ui/ScannerGuidance.gd

@@ -4,6 +4,12 @@ extends Control
 const PLANET_DEFINITIONS = preload("res://planets/PlanetDefinitions.gd")
 const EDGE_MARGIN: float = 34.0
 
+# The scene sets process_mode = ALWAYS. A narration line stops the tree
+# (NarrationBanner, #128) and the prologue is nearly all narration, so a
+# pausable marker would be absent for most of the run it exists to guide
+# (#207). Nothing here simulates anything - it reads a target and points at
+# it - so running while the game is stopped costs nothing and stops the
+# marker blinking out every time somebody speaks.
 @onready var indicator: Control = $Indicator
 @onready var target_label: Label = $TargetLabel
 
@@ -16,8 +22,11 @@ func _ready() -> void:
 
 
 func _process(_delta: float) -> void:
-	var target: Dictionary = GameState.active_scanner_target()
-	if target.is_empty() or GameState.intro_active or _modal_is_open():
+	# #207: the prologue's destination comes through the same marker, so this
+	# no longer hides for the intro - GameState decides which target is live,
+	# and an empty answer is what hides it.
+	var target: Dictionary = GameState.active_guidance_target()
+	if target.is_empty() or _modal_is_open():
 		visible = false
 		return
 	if fleet == null or not is_instance_valid(fleet):
@@ -39,8 +48,11 @@ func _process(_delta: float) -> void:
 	if toward_target.length_squared() > 0.01:
 		indicator.rotation = toward_target.angle() + PI / 2.0
 
+	# A scanned planet colours the arrow with its own map colour. The World
+	# Ship is not a planet and has no definition, so it keeps the indicator's
+	# authored colour rather than being forced into one.
 	var definition: Resource = PLANET_DEFINITIONS.get_definition(
-		String(target.definition_id))
+		String(target.get("definition_id", "")))
 	if definition != null:
 		indicator.glow_color = definition.map_color
 		indicator.queue_redraw()

ui/ScannerGuidance.tscn

@@ -6,6 +6,7 @@
 [node name="ScannerGuidance" type="Control"]
 visible = false
 mouse_filter = 2
+process_mode = 3
 anchor_right = 1.0
 anchor_bottom = 1.0
 script = ExtResource("1")