【界面UI】蓄力条视觉节奏：施法进度的填充与打断反馈

local function startCharge(duration)
    chargeStart = os.clock()
    GUI:setVisible(chargeBar, true)
    chargeId = SL:Schedule(function()
        local pct = math.min(100, (os.clock() - chargeStart) / duration * 100)
        GUI:LoadingBar_SetPercent(chargeBar, pct)
        if pct >= 100 then
            GUI:setVisible(chargeGlow, true)
        end
    end, 0.05)
end

function breakCharge()
    if chargeId ~= nil then
        SL:UnSchedule(chargeId)
        chargeId = nil
    end
    GUI:setVisible(chargeBar, false)
    GUI:setVisible(chargeGlow, false)
    SL:ShowSystemTips("蓄力被打断！")
end