Fix thread list sorting with active filters

[Copilot]

Problem

Clicking the "Last email" column header toggles the sort indicator but doesn't reorder rows when filters are active.

Root Cause

tableSearch.js hides filtered rows via display: none. The sorting code was sorting all rows including hidden ones, then re-appending them to the DOM - which made hidden rows visible again, breaking the filter.

Changes

Modified organizer/src/webroot/js/tableSorting.js to partition rows before sorting:

// Separate visible and hidden rows to preserve filter state
const visibleRows = rows.filter(row => row.style.display !== 'none');
const hiddenRows = rows.filter(row => row.style.display === 'none');

// Sort only the visible rows
visibleRows.sort((a, b) => { /* ... */ });

// Re-append: header → sorted visible rows → hidden rows

Verification

Before filtering:

With filter applied:

Sorting while filtered (critical case):

Clear filter:

Original prompt

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This section details on the original issue you should resolve

<issue_title>Thread list - The sorting does not work</issue_title>
<issue_description>The arrow switches way, but nothing else happens
</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Thread list - The sorting does not work #157

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[Copilot]

Pull request overview

This PR fixes a bug where clicking the "Last email" column header in the thread list would toggle the sort indicator but fail to reorder rows when filters were active. The root cause was that the sorting code was re-appending all rows (including hidden ones), which inadvertently made filtered rows visible again.

Changes:

• Modified tableSorting.js to partition rows into visible and hidden before sorting
• Sort operation now only reorders visible rows while preserving hidden rows at the end

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