fix(cli): stop upgrade list column widths growing with item count

[chennaji9]

What does this PR do?

CLIPrinter::printUpgradeList computed its column widths with the padding added inside the per-item loop:

std::for_each(list.cbegin(), list.cend(), [&idLen, &installedLen](const auto &info) {
    idLen = std::max(idLen, info.id.size()) + 2;
    installedLen = std::max(installedLen, info.oldVersion.size()) + 2;
});

The + 2 column padding accumulates once per package: 100 packages whose ids are all 14 characters produce a 214-character ID column instead of 16. The upgrade table bloats with the number of upgradable apps, wraps in normal terminals, and the column position depends on the item count.

Compute the maxima inside the loop and apply the padding once afterwards.

Validation

• New unit test CLIPrinter.PrintUpgradeListColumnWidthIndependentOfItemCount: 100 entries with identical 14-char ids and a single-entry list both place oldVersion at offset 16 (id.size() + 2); on the old code the 100-entry offset would be 214, so the test fails without the fix.
• All 20 CLIPrinter tests pass with the change: ctest -R CLIPrinter → 20/20 Passed (including the pre-existing PrintUpgradeList and PrintUpgradeListEmpty).
• Full ll-tests target builds cleanly.

🤖 Generated with Claude Code

[deepin-ci-robot]

Hi @chennaji9. Thanks for your PR.

I'm waiting for a OpenAtom-Linyaps member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Files with missing lines	Coverage Δ
libs/linglong/src/linglong/cli/cli_printer.cpp	44.44% <100.00%> (+0.41%)	⬆️

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