【界面UI】邮件附件领取：逐一与全部领取的交互

---邮件详情：附件的图标与状态
function MailWin.show(mailId)
    local mail = MailWin.data[mailId]
    GUI:Text_Create(MailWin.win, "title", 10, 10, 14,
        "#FFD700", mail.title)
    local list = GUI:ListView_Create(MailWin.win,
        "atts", 10, 40, 260, 120)
    for i, att in ipairs(mail.attachments) do
        local row = GUI:Text_Create(list, "att" .. i,
            0, 0, 12,
            att.claimed and "#888888" or "#FFD700",
            att.name .. " x" .. att.count ..
            (att.claimed and "（已领取）" or ""))
        GUI:addOnClickEvent(row, function()
            MailWin.claimOne(mailId, i)
        end)
    end
end

---全部领取：批量提交与部分成功
function MailWin.claimAll(mailId)
    local mail = MailWin.data[mailId]
    local failed = 0
    for i, att in ipairs(mail.attachments) do
        if not att.claimed then
            SL:SendNetMsg(MSGID.MAIL_CLAIM, mailId, i, 0, "")
        end
    end
    SL:ShowSystemTips("正在领取全部附件")
end

---背包满的优雅降级
SL:RegisterLuaNetMsg("CLAIM_RESULT", function(data)
    local d = SL:JsonDecode(data)
    if d and d.err == 2001 then
        SL:ShowSystemTips("背包空间不足，请清理后再领")
        MailWin.markBlocked(d.mailId)
    end
end)