refactor(ui): tokenize world-map HUD + minimap colors (p2-74 cluster 3b)

Route inline Color() in the world-map HUD banners and minimap onto ThemeAssets
design tokens. Visual-only (Rail 3), no logic change:

- world_map_hud: patrol banner box -> background.panel/accent.science + label
  accent.science; rally picker box -> background.panel/accent.sage + title
  accent.science; notification toast box -> background.panel/accent.gold +
  label text.primary
- minimap: const FOG_COLOR/UNEXPLORED_COLOR/PING_RING_COLOR -> _ready()-populated
  vars from fog.explored/fog.unexplored/accent.ping; border stylebox border ->
  border.panel; backdrop fill -> background.deepest

Minimap TERRAIN_COLORS biome palette stays hardcoded with an explicit comment:
it is game-content color (no UI token applies) and a deliberately distinct muted
minimap rendering, not a terrain.json mirror (the arrays diverge). Re-sourcing it
is a Rail-2 data follow-up, out of scope for this visual-only token pass.

DataLoader RGB conversion, env-var viewport color, transparent structural fills,
and the neutral gray default left as-is.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/game/engine/scenes/hud/minimap.gd

@@ -9,7 +9,12 @@ const CityScript: GDScript = preload("res://engine/src/entities/city.gd")
 const UnitScript: GDScript = preload("res://engine/src/entities/unit.gd")
 const PlayerScript: GDScript = preload("res://engine/src/entities/player.gd")
 
-## Terrain colors indexed by terrain_id — keep in sync with terrain.json
+## Minimap terrain palette indexed by terrain_id. These are game-content
+## colors (no UI design token applies) and are a deliberately distinct,
+## muted minimap rendering — NOT a mirror of terrain.json's `color` arrays
+## (those diverge by 10-70/channel; only `coast` coincides). p2-74 leaves
+## this hardcoded; routing it through a data source is a Rail-2 follow-up
+## (logic change, out of scope for the visual-only token pass).
 const TERRAIN_COLORS: Dictionary = {
 	"ocean": Color(0.12, 0.24, 0.55),
 	"coast": Color(0.31, 0.71, 0.86),
@@ -28,8 +33,6 @@ const TERRAIN_COLORS: Dictionary = {
 	"volcano": Color(0.55, 0.16, 0.12),
 }
 const DEFAULT_TERRAIN_COLOR: Color = Color(0.3, 0.3, 0.3)
-const FOG_COLOR: Color = Color(0.0, 0.0, 0.0, 0.70)
-const UNEXPLORED_COLOR: Color = Color(0.0, 0.0, 0.0, 0.90)
 const CITY_DOT_RADIUS: float = 4.0
 const UNIT_DOT_RADIUS: float = 3.0
 const OWNER_TINT_ALPHA: float = 0.38
@@ -39,7 +42,6 @@ const OWNER_TILE_SIZE: Vector2 = Vector2(3.0, 3.0)
 ## `_ping_remaining` ticks down each overlay redraw frame so the pulse
 ## fades naturally without a dedicated tween.
 const PING_DURATION_SEC: float = 1.6
-const PING_RING_COLOR: Color = Color(1.0, 0.92, 0.45, 1.0)
 const PING_RING_BASE_RADIUS: float = 4.0
 const PING_RING_GROWTH: float = 8.0
 const PING_RING_WIDTH: float = 2.0
@@ -53,6 +55,14 @@ var _camera: Camera2D = null
 var _ping_axial: Vector2i = Vector2i(-9999, -9999)
 var _ping_started_at: float = -1.0
 
+## Token-sourced colors, populated in _ready() (ThemeAssets.color isn't
+## const-eval safe). fog/ping map to dedicated design tokens; the minimap
+## backdrop uses the deepest background token.
+var _fog_color: Color = Color(0.0, 0.0, 0.0, 0.70)
+var _unexplored_color: Color = Color(0.0, 0.0, 0.0, 0.90)
+var _ping_ring_color: Color = Color(1.0, 0.92, 0.45, 1.0)
+var _backdrop_color: Color = Color(0.04, 0.04, 0.06)
+
 @onready var _map_rect: TextureRect = %MapRect
 @onready var _overlay_rect: Control = %OverlayRect
 
@@ -62,11 +72,16 @@ func _ready() -> void:
 	_overlay_rect.draw.connect(_draw_overlay)
 	gui_input.connect(_on_gui_input)
 
+	_fog_color = ThemeAssets.color("fog.explored")
+	_unexplored_color = ThemeAssets.color("fog.unexplored")
+	_ping_ring_color = ThemeAssets.color("accent.ping")
+	_backdrop_color = ThemeAssets.color("background.deepest")
+
 	var border_panel: Panel = get_node_or_null("Border") as Panel
 	if border_panel != null:
 		var style: StyleBoxFlat = StyleBoxFlat.new()
 		style.bg_color = Color(0.0, 0.0, 0.0, 0.0)
-		style.border_color = Color(0.75, 0.65, 0.35, 0.95)
+		style.border_color = ThemeAssets.color("border.panel")
 		style.set_border_width_all(2)
 		style.set_corner_radius_all(2)
 		border_panel.add_theme_stylebox_override("panel", style)
@@ -141,7 +156,7 @@ func _rebuild_terrain() -> void:
 	var img_w: int = maxi(1, roundi(mm_size.x))
 	var img_h: int = maxi(1, roundi(mm_size.y))
 	_cached_image = Image.create(img_w, img_h, false, Image.FORMAT_RGB8)
-	_cached_image.fill(Color(0.04, 0.04, 0.06))
+	_cached_image.fill(_backdrop_color)
 
 	for py: int in img_h:
 		for px: int in img_w:
@@ -204,7 +219,7 @@ func _draw_ping() -> void:
 		return
 	var t: float = clampf(elapsed / PING_DURATION_SEC, 0.0, 1.0)
 	var radius: float = PING_RING_BASE_RADIUS + PING_RING_GROWTH * t
-	var color: Color = PING_RING_COLOR
+	var color: Color = _ping_ring_color
 	color.a = 1.0 - t
 	var pixel_pos: Vector2 = _world_to_mini(
 		HexUtilsScript.axial_to_pixel(_ping_axial) + Vector2(
@@ -224,7 +239,7 @@ func _draw_fog(game_map: RefCounted, player_index: int) -> void:
 				HexUtilsScript.HEX_WIDTH * 0.5, HexUtilsScript.HEX_HEIGHT * 0.5
 			)
 		)
-		var fog_col: Color = FOG_COLOR if vis == 1 else UNEXPLORED_COLOR
+		var fog_col: Color = _fog_color if vis == 1 else _unexplored_color
 		_overlay_rect.draw_rect(
 			Rect2(pixel_pos - Vector2(1.0, 1.0), Vector2(3.0, 3.0)), fog_col
 		)

src/game/engine/scenes/hud/world_map_hud.gd

@@ -213,8 +213,8 @@ func _build_patrol_banner() -> void:
 	_patrol_banner.offset_bottom = 162.0
 	_patrol_banner.visible = false
 	var style: StyleBoxFlat = StyleBoxFlat.new()
-	style.bg_color = Color(0.05, 0.08, 0.14, 0.94)
+	style.bg_color = ThemeAssets.color("background.panel")
-	style.border_color = Color(0.3, 0.55, 0.9, 0.9)
+	style.border_color = ThemeAssets.color("accent.science")
 	style.set_border_width_all(2)
 	style.set_corner_radius_all(4)
 	style.content_margin_left = 12.0
@@ -226,7 +226,7 @@ func _build_patrol_banner() -> void:
 	_patrol_banner_label = Label.new()
 	_patrol_banner_label.name = "PatrolBannerLabel"
 	_patrol_banner_label.add_theme_font_size_override("font_size", 15)
-	_patrol_banner_label.add_theme_color_override("font_color", Color(0.75, 0.88, 1.0))
+	_patrol_banner_label.add_theme_color_override("font_color", ThemeAssets.color("accent.science"))
 	_patrol_banner_label.horizontal_alignment = HORIZONTAL_ALIGNMENT_CENTER
 	_patrol_banner_label.autowrap_mode = TextServer.AUTOWRAP_WORD_SMART
 	_patrol_banner.add_child(_patrol_banner_label)
@@ -245,8 +245,8 @@ func _build_rally_command_picker() -> void:
 	_rally_command_picker.offset_bottom = 48.0
 	_rally_command_picker.visible = false
 	var style: StyleBoxFlat = StyleBoxFlat.new()
-	style.bg_color = Color(0.05, 0.08, 0.14, 0.96)
+	style.bg_color = ThemeAssets.color("background.panel")
-	style.border_color = Color(0.55, 0.75, 0.35, 0.9)
+	style.border_color = ThemeAssets.color("accent.sage")
 	style.set_border_width_all(2)
 	style.set_corner_radius_all(4)
 	style.content_margin_left = 14.0
@@ -263,7 +263,7 @@ func _build_rally_command_picker() -> void:
 	var title: Label = Label.new()
 	title.text = ThemeVocabulary.lookup("rally_command_pick_title")
 	title.add_theme_font_size_override("font_size", 13)
-	title.add_theme_color_override("font_color", Color(0.75, 0.88, 1.0))
+	title.add_theme_color_override("font_color", ThemeAssets.color("accent.science"))
 	title.horizontal_alignment = HORIZONTAL_ALIGNMENT_CENTER
 	vbox.add_child(title)
 
@@ -360,8 +360,8 @@ func show_notification(text: String) -> void:
 	panel.mouse_filter = Control.MOUSE_FILTER_IGNORE
 
 	var style: StyleBoxFlat = StyleBoxFlat.new()
-	style.bg_color = Color(0.08, 0.06, 0.04, 0.92)
+	style.bg_color = ThemeAssets.color("background.panel")
-	style.border_color = Color(0.85, 0.7, 0.3, 0.85)
+	style.border_color = ThemeAssets.color("accent.gold")
 	style.set_border_width_all(2)
 	style.set_corner_radius_all(4)
 	style.content_margin_left = 12.0
@@ -373,7 +373,7 @@ func show_notification(text: String) -> void:
 	var label: Label = Label.new()
 	label.text = text
 	label.add_theme_font_size_override("font_size", 14)
-	label.add_theme_color_override("font_color", Color(1.0, 0.94, 0.78))
+	label.add_theme_color_override("font_color", ThemeAssets.color("text.primary"))
 	label.autowrap_mode = TextServer.AUTOWRAP_WORD_SMART
 	panel.add_child(label)