Investigate commented-out Delete action test code in menuactions.cpp

## Summary

There is commented-out test code for a Delete action in the test suite that needs clarification.

### Location 1: `tests/menuactions/menuactions.cpp` (lines 186-189)

In the `testCutCopyDeleteEnabledStates` function:

```cpp
// if (action->text().contains(QStringLiteral("Delete")))
// {
// hasDeleteAction = true;
// }
```

Note: The `hasDeleteAction` variable is declared but never used because this code is commented out.

### Location 2: `tests/smoke/smoke.cpp` (lines 1545-1556)

In the `testDateFormatPreference` function, similar pattern for Date Format actions:

```cpp
// auto actions = window.findChildren();
// bool hasDateFormatAction = false;
// for (const auto* action : actions)
// {
// if (action->text().contains(QStringLiteral("Date Format"), Qt::CaseInsensitive) ||
// action->text().contains(QStringLiteral("Short"), Qt::CaseInsensitive) ||
// action->text().contains(QStringLiteral("Long"), Qt::CaseInsensitive))
// {
// hasDateFormatAction = true;
// break;
// }
// }
```

## Questions to resolve

1. **Was the Delete action intentionally removed from the UI?** If so, this commented code should be deleted.
2. **Is the Delete action planned but not yet implemented?** If so, this should be tracked as a feature request.
3. **Is the Delete action present but under a different name?** The test may need updating to use the correct action text.
4. **Same questions apply to Date Format actions** - are they exposed in the UI?

## Context

This pattern of commenting out tests suggests features that may not be fully implemented or exposed in the UI yet.

## Suggested resolution

- If Delete action is not part of the application design, remove the commented code and the unused `hasDeleteAction` variable
- If Delete action should exist, investigate why it's missing and create a follow-up issue
- Update the test function name (`testCutCopyDeleteEnabledStates`) to match what it actually tests if Delete is intentionally excluded
- Apply same cleanup to Date Format action code in smoke.cpp

Inspect the commented sections in tests/menuactions/menuactions.cpp and tests/smoke/smoke.cpp, then trace whether the Delete and Date Format actions are exposed by the application. Confirm their intended status with the current UI behavior; done means removing obsolete commented code and the unused variable, or documenting the missing feature and updating the test scope.

Written by the indexing model from the issue text.