Fix "Custom visibility" test to validate non-default behavior

[Copilot]

The bot reviewer correctly identified that the "Custom visibility" test was testing default behavior (IsVisible: false) instead of custom behavior. This has been corrected.

Changes

• Test coverage now properly validates both behaviors:
  • "Success" test: validates default IsVisible: false when not explicitly set
  • "Custom visibility" test: validates custom IsVisible: true when explicitly set

t.Run("Custom visibility", func(t *testing.T) {
    task := &schemas.Task{
        Title:     "Visible Task",
        CreatedBy: adminUser.ID,
        IsVisible: true,  // Changed from false to test non-default
    }
    // ...
    tr.EXPECT().Create(gomock.Any(), gomock.Any()).DoAndReturn(func(_ database.Database, model *models.Task) (int64, error) {
        assert.True(t, model.IsVisible)  // Changed from False to True
        return int64(2), nil
    }).Times(1)
    // ...
})

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