【界面UI】界面缩放：UI 适配的锚点与缩放策略

---UI 的锚点绑定：九宫格定位
local ANCHORS = {
    leftTop = { x = 0, y = 1 },
    center = { x = 0.5, y = 0.5 },
    rightBottom = { x = 1, y = 0 },
}

function UiLayout.bind(node, anchor, offsetX, offsetY)
    local sw, sh = Screen.size()
    local base = ANCHORS[anchor]
    node:SetPosition(
        base.x * sw + offsetX,
        base.y * sh + offsetY)
end

---小地图绑定右上角
UiLayout.bind(MiniMap.node, 'rightTop', -180, 40)

---UI 的整体缩放：全局的缩放系数
local SCALE_STEPS = { 0.8, 1.0, 1.25, 1.5 }

function UiScale.apply(step)
    local factor = SCALE_STEPS[step]
    UiRoot:SetScale(factor)
    Settings.set('uiScale', step)
end

---安全区的避让：刘海与圆角的遮挡
function UiScale.safeArea(win)
    local inset = Screen.safeAreaInsets()
    win:SetPosition(win.x + inset.left, win.y + inset.top)
end