feat(designer): 新增整数元组列表行编辑器组件

addons/game_designer/tuple_list_editor.gd

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+## 整数元组列表编辑器（@tool）— 每行 N 个 SpinBox + 🗑 删行，底部 ➕ 加行。
+## 用于 Core edges（from/to）、balance aether_thresholds（波次/碎片）等可变长小整数元组列表。
+## 数据模型：Array[Array]（行数组）；调用方负责与自身 JSON 结构互转。
+@tool
+extends VBoxContainer
+
+var _cols: Array = []            # [{label,min,max,step,int,default}]
+var _rows_box: VBoxContainer
+var _add_label: String = "➕ 加行"
+
+func setup(col_specs: Array, add_label: String = "➕ 加行") -> void:
+	_cols = col_specs
+	_add_label = add_label
+	_rows_box = VBoxContainer.new()
+	add_child(_rows_box)
+	var add_btn := Button.new()
+	add_btn.text = _add_label
+	add_btn.pressed.connect(_on_add)
+	add_child(add_btn)
+
+func set_values(rows: Array) -> void:
+	if _rows_box == null:
+		return
+	for c in _rows_box.get_children():
+		_rows_box.remove_child(c)
+		c.free()
+	for r in rows:
+		_add_row(r)
+
+func get_values() -> Array:
+	var out: Array = []
+	if _rows_box == null:
+		return out
+	for h in _rows_box.get_children():
+		var row: Array = []
+		var ci := 0
+		for ch in h.get_children():
+			if ch is SpinBox:
+				var v: float = (ch as SpinBox).value
+				var is_int: bool = bool(_cols[ci].get("int", true)) if ci < _cols.size() else true
+				row.append(int(v) if is_int else v)
+				ci += 1
+		out.append(row)
+	return out
+
+func _on_add() -> void:
+	_add_row([])
+
+func _add_row(vals: Array) -> void:
+	var h := HBoxContainer.new()
+	for i in _cols.size():
+		var c: Dictionary = _cols[i]
+		var lbl := String(c.get("label", ""))
+		if lbl != "":
+			var l := Label.new(); l.text = lbl
+			h.add_child(l)
+		var sp := SpinBox.new()
+		sp.min_value = c.get("min", 0)
+		sp.max_value = c.get("max", 100000)
+		sp.step = c.get("step", 1)
+		sp.value = float(vals[i]) if i < vals.size() else float(c.get("default", c.get("min", 0)))
+		sp.size_flags_horizontal = Control.SIZE_EXPAND_FILL
+		h.add_child(sp)
+	var del := Button.new()
+	del.text = "🗑"
+	del.pressed.connect(func(): _rows_box.remove_child(h); h.queue_free())
+	h.add_child(del)
+	_rows_box.add_child(h)