feat: adding the skin_shader_generator, and gacha base barebone

scripts/tools/skin_catalog_editor.gd

@@ -40,6 +40,7 @@ var _form_star:       SpinBox
 var _form_category:   OptionButton
 var _form_rarity:     OptionButton
 var _slots_vbox:      VBoxContainer
+var _duplicate_btn:   Button
 var _delete_btn:      Button
 var _save_btn:        Button
 
@@ -77,6 +78,12 @@ func _build_ui() -> void:
 	add_btn.pressed.connect(_on_add_pressed)
 	top.add_child(add_btn)
 
+	_duplicate_btn = Button.new()
+	_duplicate_btn.text = "📋 Duplicate"
+	_duplicate_btn.disabled = true
+	_duplicate_btn.pressed.connect(_on_duplicate_pressed)
+	top.add_child(_duplicate_btn)
+
 	_delete_btn = Button.new()
 	_delete_btn.text = "✕ Delete"
 	_delete_btn.disabled = true
@@ -247,7 +254,9 @@ func _refresh_list() -> void:
 		c.queue_free()
 	for i in _data.size():
 		var entry: Dictionary = _data[i]
-		var btn := Button.new()
+		var btn := SkinListItem.new()
+		btn.index = i
+		btn.editor = self
 		var cat: String = entry.get("category", "?")
 		var iid: String = entry.get("item_id", "?")
 		btn.text = "[%s]\n%s" % [cat, iid]
@@ -273,11 +282,13 @@ func _populate_form() -> void:
 	if _selected_idx < 0 or _selected_idx >= _data.size():
 		_form_panel.visible  = false
 		_no_sel_label.visible = true
+		_duplicate_btn.disabled = true
 		_delete_btn.disabled  = true
 		return
 
 	_form_panel.visible  = true
 	_no_sel_label.visible = false
+	_duplicate_btn.disabled = false
 	_delete_btn.disabled  = false
 
 	var e: Dictionary = _data[_selected_idx]
@@ -388,6 +399,20 @@ func _on_add_pressed() -> void:
 	_set_status("New skin created. Fill in the form and Save & Generate.", Color.YELLOW)
 
 
+func _on_duplicate_pressed() -> void:
+	if _selected_idx < 0:
+		return
+	_commit_form()
+	var original = _data[_selected_idx]
+	var duplicate = original.duplicate(true)
+	duplicate["item_id"] += "_copy"
+	_data.insert(_selected_idx + 1, duplicate)
+	_selected_idx += 1
+	_refresh_list()
+	_populate_form()
+	_set_status("Skin duplicated.", Color.YELLOW)
+
+
 func _on_delete_pressed() -> void:
 	if _selected_idx < 0:
 		return
@@ -399,6 +424,19 @@ func _on_delete_pressed() -> void:
 	_set_status("Deleted: " + removed, Color.YELLOW)
 
 
+func move_item(from_idx: int, to_idx: int) -> void:
+	if from_idx == to_idx:
+		return
+	_commit_form()
+	var item = _data[from_idx]
+	_data.remove_at(from_idx)
+	_data.insert(to_idx, item)
+	_selected_idx = to_idx
+	_refresh_list()
+	_populate_form()
+	_set_status("Reordered: %s" % item.get("item_id", "?"), Color.WHITE)
+
+
 func _on_add_slot_pressed() -> void:
 	if _selected_idx < 0:
 		return
@@ -534,3 +572,22 @@ func _set_status(msg: String, color: Color = Color.WHITE) -> void:
 		return
 	_status_label.add_theme_color_override("font_color", color)
 	_status_label.text = msg
+
+
+# ─── Inner Classes ───────────────────────────────────────────────────────────
+class SkinListItem extends Button:
+	var index: int
+	var editor: Control
+
+	func _get_drag_data(_at_position: Vector2) -> Variant:
+		var preview := Button.new()
+		preview.text = text
+		preview.modulate.a = 0.5
+		set_drag_preview(preview)
+		return index
+
+	func _can_drop_data(_at_position: Vector2, data: Variant) -> bool:
+		return typeof(data) == TYPE_INT
+
+	func _drop_data(_at_position: Vector2, data: Variant) -> void:
+		editor.move_item(data, index)