Add final progression to tiny sword, fixes and tweeks required

docs/gyms/tiny_sword/buildings/devil_idol/Castle.png.import

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+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://rpedoq4102to"
+path="res://.godot/imported/Castle.png-abe84e074a7668619903091d591ffce7.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://docs/gyms/tiny_sword/buildings/devil_idol/Castle.png"
+dest_files=["res://.godot/imported/Castle.png-abe84e074a7668619903091d591ffce7.ctex"]
+
+[params]
+
+compress/mode=0
+compress/high_quality=false
+compress/lossy_quality=0.7
+compress/uastc_level=0
+compress/rdo_quality_loss=0.0
+compress/hdr_compression=1
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=false
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/channel_remap/red=0
+process/channel_remap/green=1
+process/channel_remap/blue=2
+process/channel_remap/alpha=3
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=1

docs/gyms/tiny_sword/buildings/devil_idol/devil_idol.gd

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+class_name DevilIdol
+extends Node2D
+
+const UNLOCK_GOAL_ID: StringName = &"gold_50M_food_5M_wood_5M"
+const SAVE_KEY: String = "devil_idol_state"
+const HP_KEY: String = "current_hp"
+
+## Emitted when the idol takes damage.
+signal idol_damaged(current_hp: BigNumber, max_hp: BigNumber)
+## Emitted when the idol is destroyed (one-time win condition).
+signal idol_destroyed()
+
+## Maximum HP mantissa.
+@export var max_hp_mantissa: float = 1.0
+## Maximum HP exponent (default 1e12 = 1 trillion).
+@export var max_hp_exponent: int = 12
+
+@onready var game_state: LevelGameState = find_parent("LevelGameState")
+@onready var _sprite: Sprite2D = $Sprite2D
+@onready var _area: Area2D = $Area2D
+@onready var _panel: PanelContainer = $IdolPanel
+@onready var _hp_value: Label = $IdolPanel/MarginContainer/VBoxContainer/HPValue
+@onready var _damage_button: Button = $IdolPanel/MarginContainer/VBoxContainer/DamageButton
+@onready var _victory_label: Label = $IdolPanel/MarginContainer/VBoxContainer/VictoryLabel
+
+var _max_hp: BigNumber
+var _current_hp: BigNumber
+var _is_targetable: bool = false
+var _is_destroyed: bool = false
+
+
+func _ready() -> void:
+	assert(game_state != null, "DevilIdol: LevelGameState parent not found")
+
+	_max_hp = BigNumber.new(max_hp_mantissa, max_hp_exponent)
+	_current_hp = BigNumber.new(max_hp_mantissa, max_hp_exponent)
+
+	# Load persisted HP from save data
+	_load_state()
+
+	# Panel hidden by default; shown on hover if unlocked
+	_panel.visible = false
+	_victory_label.visible = false
+	_damage_button.pressed.connect(_on_damage_button_pressed)
+
+	# Connect to goal completion for unlocking
+	game_state.goal_completed.connect(_on_goal_completed)
+
+	# If goal was already completed in a previous session, unlock immediately
+	if game_state.is_goal_completed(UNLOCK_GOAL_ID):
+		_unlock_idol()
+
+	_update_ui()
+
+
+func _on_area_2d_mouse_entered() -> void:
+	if _is_targetable and not _is_destroyed:
+		_panel.visible = true
+
+
+func _on_area_2d_mouse_exited() -> void:
+	_panel.visible = false
+
+
+func _on_goal_completed(goal_id: StringName) -> void:
+	if goal_id == UNLOCK_GOAL_ID:
+		_unlock_idol()
+
+
+func _unlock_idol() -> void:
+	_is_targetable = true
+
+
+func _on_damage_button_pressed() -> void:
+	if _is_destroyed:
+		return
+
+	var unit_balance: BigNumber = game_state.get_currency_amount_by_id(&"unit")
+	if unit_balance.mantissa <= 0.0:
+		return
+
+	# Spend all available units as damage
+	var damage: BigNumber = BigNumber.new(unit_balance.mantissa, unit_balance.exponent)
+	if game_state.spend_currency_by_id(&"unit", damage):
+		_current_hp = _current_hp.subtract(damage)
+		if _current_hp.mantissa <= 0.0:
+			_current_hp = BigNumber.new(0.0, 0)
+			_is_destroyed = true
+			idol_destroyed.emit()
+			_victory_label.visible = true
+			_panel.visible = true
+
+		idol_damaged.emit(_current_hp, _max_hp)
+		_save_state()
+		_update_ui()
+
+
+func _update_ui() -> void:
+	if _is_destroyed:
+		_hp_value.text = "0 / %s  —  DESTROYED" % _max_hp.to_string_suffix(2)
+		_damage_button.disabled = true
+		_damage_button.text = "VICTORY!"
+		return
+
+	var progress_pct: float = 0.0
+	if _max_hp.mantissa > 0.0:
+		progress_pct = (1.0 - (_current_hp.mantissa / _max_hp.mantissa)) * pow(10.0, float(_current_hp.exponent - _max_hp.exponent))
+		progress_pct = clampf(progress_pct * 100.0, 0.0, 100.0)
+
+	_hp_value.text = "%s / %s (%.1f%%)" % [_current_hp.to_string_suffix(2), _max_hp.to_string_suffix(2), progress_pct]
+
+	var unit_balance: BigNumber = game_state.get_currency_amount_by_id(&"unit")
+	_damage_button.text = "Send Army (%s units)" % unit_balance.to_string_suffix(2)
+	_damage_button.disabled = unit_balance.mantissa <= 0.0
+
+
+func _save_state() -> void:
+	if game_state == null:
+		return
+	var payload: Dictionary = {HP_KEY: _current_hp.serialize()}
+	game_state.set_external_save_data(SAVE_KEY, payload)
+
+
+func _load_state() -> void:
+	if game_state == null:
+		return
+	var saved: Dictionary = game_state.get_external_save_data(SAVE_KEY)
+	if saved.has(HP_KEY):
+		var raw_hp: Variant = saved.get(HP_KEY)
+		if raw_hp is Dictionary:
+			_current_hp = BigNumber.deserialize(raw_hp)
+			if _current_hp.mantissa <= 0.0:
+				_current_hp = BigNumber.new(0.0, 0)
+				_is_destroyed = true
+				_victory_label.visible = true

docs/gyms/tiny_sword/buildings/devil_idol/devil_idol.gd.uid

@@ -0,0 +1 @@
+uid://blfof77kjp7x0

docs/gyms/tiny_sword/buildings/devil_idol/devil_idol.tscn

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+[gd_scene format=3 uid="uid://d1cvlnd5vwjol"]
+
+[ext_resource type="Script" uid="uid://blfof77kjp7x0" path="res://docs/gyms/tiny_sword/buildings/devil_idol/devil_idol.gd" id="1_script"]
+[ext_resource type="Texture2D" uid="uid://rpedoq4102to" path="res://docs/gyms/tiny_sword/buildings/devil_idol/Castle.png" id="2_g7pcm"]
+
+[sub_resource type="RectangleShape2D" id="RectangleShape2D_idol"]
+size = Vector2(312, 198)
+
+[node name="DevilIdol" type="Node2D" unique_id=797117647]
+script = ExtResource("1_script")
+
+[node name="Sprite2D" type="Sprite2D" parent="." unique_id=661703335]
+texture = ExtResource("2_g7pcm")
+
+[node name="Area2D" type="Area2D" parent="." unique_id=1812195052]
+
+[node name="CollisionShape2D" type="CollisionShape2D" parent="Area2D" unique_id=1492517397]
+position = Vector2(1, 22)
+shape = SubResource("RectangleShape2D_idol")
+
+[node name="IdolPanel" type="PanelContainer" parent="." unique_id=906038530]
+offset_left = -200.0
+offset_top = -120.0
+offset_right = 200.0
+offset_bottom = -10.0
+
+[node name="MarginContainer" type="MarginContainer" parent="IdolPanel" unique_id=1952977282]
+layout_mode = 2
+theme_override_constants/margin_left = 10
+theme_override_constants/margin_top = 10
+theme_override_constants/margin_right = 10
+theme_override_constants/margin_bottom = 10
+
+[node name="VBoxContainer" type="VBoxContainer" parent="IdolPanel/MarginContainer" unique_id=1214756176]
+layout_mode = 2
+theme_override_constants/separation = 8
+
+[node name="TitleLabel" type="Label" parent="IdolPanel/MarginContainer/VBoxContainer" unique_id=1268978638]
+layout_mode = 2
+text = "Devil Idol"
+
+[node name="HPValue" type="Label" parent="IdolPanel/MarginContainer/VBoxContainer" unique_id=529436307]
+layout_mode = 2
+text = "??? / ???"
+
+[node name="DamageButton" type="Button" parent="IdolPanel/MarginContainer/VBoxContainer" unique_id=1565608485]
+layout_mode = 2
+disabled = true
+text = "Send Army"
+
+[node name="VictoryLabel" type="Label" parent="IdolPanel/MarginContainer/VBoxContainer" unique_id=169309796]
+layout_mode = 2
+text = "THE DEVIL IDOL HAS BEEN DESTROYED!"
+horizontal_alignment = 1
+
+[connection signal="mouse_entered" from="Area2D" to="." method="_on_area_2d_mouse_entered"]
+[connection signal="mouse_exited" from="Area2D" to="." method="_on_area_2d_mouse_exited"]