[pengfeixx]

fix: truncate fractional seconds in 7-Zip Modified time

1. Root cause: new 7-Zip (24.09+/26.x) -slt output includes
   fractional seconds in "Modified" field (e.g. 2025-06-04
   11:11:04.8826983), QDateTime::fromString with format
   "yyyy-MM-dd hh:mm:ss" fails to parse, returns invalid QDateTime
2. Fix: truncate the fractional seconds part (dot and after) before
   calling fromString, so both old and new 7-Zip time formats work
3. Impact: archive Modified time now displays correctly instead of
   1970/01/01; no effect on archives without fractional seconds

Log: Fix archive file Modified time showing as 1970/01/01

Influence:

1. Test opening 7z archives created by new 7-Zip with fractional
   seconds in Modified field
2. Test opening 7z archives created by old 7-Zip without fractional
   seconds
3. Verify Modified time displays correctly for various archive types

fix: 截断7-Zip Modified时间字段的小数秒部分

1. 根因：新版7-Zip（24.09+/26.x）的-slt输出中"Modified"字段带小数秒
   （如2025-06-04 11:11:04.8826983），QDateTime::fromString使用
   "yyyy-MM-dd hh:mm:ss"格式解析失败，返回无效QDateTime
2. 方案：在调用fromString前截断小数秒部分（小数点及之后内容），
   兼容新旧两种7-Zip时间格式
3. 影响：修复后压缩包修改时间正常显示，不再显示为1970/01/01；
   对不含小数秒的旧格式压缩包无影响

Log: 修复压缩包文件修改时间显示为1970/01/01的问题

Influence:

1. 测试使用新版7-Zip创建的带小数秒Modified字段的7z压缩包
2. 测试使用旧版7-Zip创建的不带小数秒的7z压缩包
3. 验证各种压缩包类型的修改时间显示正确

PMS: BUG-378795

Summary by Sourcery

Ensure 7-Zip archive Modified timestamps are parsed correctly across timestamp formats.

Bug Fixes:

• Fix archive Modified timestamps displaying as 1970/01/01 when newer 7-Zip versions include fractional seconds in the timestamp.

Enhancements:

• Support both fractional and non-fractional 7-Zip Modified timestamp formats.

[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: pengfeixx

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[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Updates 7-Zip Modified-time parsing to truncate fractional seconds before applying the existing second-precision format, preventing invalid dates and restoring correct archive timestamps for both new and legacy 7-Zip output.

Sequence diagram for 7-Zip Modified time parsing

sequenceDiagram
    participant SevenZip as 7-Zip
    participant Plugin as Cli7zPlugin
    participant Qt as QDateTime

    SevenZip->>Plugin: readListLine(line)
    Plugin->>Plugin: line.mid(11).trimmed()
    opt fractional seconds present
        Plugin->>Plugin: modifiedTime.truncate(dotIndex)
    end
    Plugin->>Qt: fromString(modifiedTime, yyyy-MM-dd hh:mm:ss)
    Qt-->>Plugin: valid archive Modified time

Loading

File-Level Changes

Change	Details	Files
Normalize 7-Zip archive timestamps before parsing to support fractional-second output.	Extract the Modified field value and remove the decimal point and all following fractional digits. Parse the normalized timestamp with the existing Qt-version-specific conversion path, preserving compatibility with timestamps that have no fractional seconds.	3rdparty/cli7zplugin/cli7zplugin.cpp
Add pull-request metadata for the bug fix.	Record the BUG-378795 fix details and test influence notes in the commit message file.	fix/378795/commit-msg.txt

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