Allow SVG through kses in social-share buttons

wp_kses_post() strips <svg> tags by default (the 'post' context doesn't
allow them), so the icons were being silently removed from the rendered
HTML. Extend the allowed list to include svg/path/rect/circle/line with
the attributes the Tabler-style icons actually use.

projects-portfolio.php

@@ -387,6 +387,51 @@ function projects_portfolio_social_sharing_buttons( $project_id ) {
 
     $html .= '</div>';
 
-    echo wp_kses_post( $html );
+    // wp_kses_post() strips <svg> by default (the 'post' context doesn't allow it).
+    // Extend the allowed list to keep SVG markup intact so the icons render.
+    $allowed = wp_kses_allowed_html( 'post' );
+    $allowed['svg']  = array(
+        'xmlns'               => true,
+        'class'               => true,
+        'width'               => true,
+        'height'              => true,
+        'viewBox'             => true,
+        'fill'                => true,
+        'stroke'              => true,
+        'stroke-width'        => true,
+        'stroke-linecap'      => true,
+        'stroke-linejoin'     => true,
+        'aria-hidden'         => true,
+        'focusable'           => true,
+    );
+    $allowed['path']    = array(
+        'd'                   => true,
+        'fill'                => true,
+        'stroke'              => true,
+    );
+    $allowed['rect']    = array(
+        'x'                   => true,
+        'y'                   => true,
+        'width'               => true,
+        'height'              => true,
+        'fill'                => true,
+        'stroke'              => true,
+    );
+    $allowed['circle']  = array(
+        'cx'                  => true,
+        'cy'                  => true,
+        'r'                   => true,
+        'fill'                => true,
+        'stroke'              => true,
+    );
+    $allowed['line']    = array(
+        'x1'                  => true,
+        'y1'                  => true,
+        'x2'                  => true,
+        'y2'                  => true,
+        'stroke'              => true,
+    );
+
+    echo wp_kses( $html, $allowed );
 }
 add_action( 'projects_after_download_button', 'projects_portfolio_social_sharing_buttons', 999 );