fix: add missing alt text to Who's Online widget avatar

[i-am-chitti]

Description

This Pull Request resolves an accessibility issue where the avatar in the "Who's Online" dashboard widget is rendered without alternative text (alt="").

In includes/widgets/class-wp-presence-widget-whos-online.php, get_avatar() was called without the $alt argument:

echo wp_kses_post( get_avatar( $user->ID, 24 ) );

This PR updates the call to pass the user's display_name as the $alt parameter, matching the existing pattern used elsewhere in the plugin (e.g., includes/post-list.php):

echo wp_kses_post( get_avatar( $user->ID, 24, '', $user->display_name ) );

Fixes

• Missing alt text on Who's Online widget avatar #142

[github-actions]

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Props iamchitti.

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[github-actions]

▶ Preview in WordPress Playground

Boots a fresh WordPress with this PR's presence-api build, seeds 5 demo users, and drops you on the dashboard.

_{Stress-test variant: 40 demo users · Built from 1771cf2711ef647670942dd4d769a2ffaf363571. Auto-updates when you push.}

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 28.94%. Comparing base (f1f3a2e) to head (1771cf2).
⚠️ Report is 44 commits behind head on main.

Files with missing lines	Patch %	Lines
...s/widgets/class-wp-presence-widget-whos-online.php	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #147      +/-   ##
============================================
+ Coverage     27.24%   28.94%   +1.70%     
  Complexity      174      174              
============================================
  Files            15       15              
  Lines          1817     1817              
============================================
+ Hits            495      526      +31     
+ Misses         1322     1291      -31     

Flag	Coverage Δ
phpunit	28.94% <0.00%> (+1.70%)	⬆️

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