Feature Request: Add Standard Errors to Tabular Output in Classical Meta-Analysis

Summary:
Classical meta-analysis does not currently display the standard errors (SEs) of the pooled effect size estimate and the estimated marginal means/contrasts in the tabular output. This feature request is to extract and display these SEs as a new column immediately following the respective estimate columns in the following outputs:

1. Pooled effect size estimate (main output)
2. Estimated marginal means
3. Estimated contrasts

Implementation Notes:

• This change requires modifications to multiple helper functions that extract effect size and marginal mean values. Existing functionality must be preserved.
• Standard errors should NOT be shown when effect size transformation is specified, as the SEs do not follow the simple transformation.
• The effect size transformation is controlled by QML. Please identify the relevant QML options and ensure SEs are only displayed when transformation is OFF.
• Output formatting: SEs should be presented in a new column directly after each estimate column in all relevant tables.
• Maintain consistency with existing numeric formatting unless otherwise specified in repository standards.

Additional Notes:

• Please ensure the changes are documented and tested for backward compatibility.
• If the repository has specific guidelines for displaying numeric columns, follow those for SE columns.

Feature requested by user: @FBartos