Sort numeric custom fields by value

[sorinmarta]

fixes Strategy11/business-directory-premium#90

Validated numeric fields now sort by value across sortbar and default directory queries through shared numeric-aware orderby handling.

[coderabbitai]

Walkthrough

The sortbar_orderby() function was modified to introduce a $numeric_sort flag that determines whether a meta-derived sort field should use a numeric-safe REPLACE/+0 expression instead of the existing get_space_replace() ordering logic.

Changes

Sortbar Orderby Numeric Handling

Layer / File(s)	Summary
Numeric sort flag and orderby clause generation includes/class-query-integration.php	Adds a $numeric_sort flag computed from field expression comparison and numeric type check, then conditionally builds the orderby clause using a REPLACE(..., ' ', '') + 0 numeric expression or the existing get_space_replace() path.

Estimated code review effort: 2 (Simple) | ~10 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly summarizes the main change: sorting numeric custom fields by value.
Description check	✅ Passed	The description is directly related to the change and accurately describes numeric-aware sorting.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/numeric-field-sort

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