fix(0.3.2): play-button glyph baseline — drop dashicon for Unicode ▶ / ‖

The dashicon used for the play/pause icon was rendering visibly below
the button text — dashicon font metrics sit the glyph low inside its
own box, so even with `inline-flex` centering the symbol looked like
it was on a separate row from the word "Play".

Swap dashicons-controls-play / dashicons-controls-pause for plain
Unicode glyphs (▶ / ‖) which render on the text baseline like any
other character. Flex container changed to align-items: baseline.
font-variant-emoji: text on the glyph span to keep platforms that
might otherwise pick up an emoji variant of ▶ as monochrome text.

Files: radio.php (version), inc/admin-page.php +
inc/dashboard-widget.php (dashicon span → glyph span),
assets/css/radio.css (drop dashicon-sizing rule, add
.radio-player__play-glyph, baseline alignment),
assets/js/radio.js (setPlayIcon swaps glyph textContent instead of
dashicon className), inc/about.php (history entry).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

inc/about.php

@@ -48,7 +48,11 @@ function radio_render_about_page() {
                 <h2><?php esc_html_e( 'Version history', 'radio' ); ?></h2>
                 <ul>
                     <li>
-                        <span class="ver">v0.3.1</span> &mdash; 29 May 2026 <span class="latest">latest</span><br>
+                        <span class="ver">v0.3.2</span> &mdash; 29 May 2026 <span class="latest">latest</span><br>
+                        <?php esc_html_e( 'Play-button glyph baseline fix. The dashicon used for play/pause was rendering below the button text. Swapped to a plain Unicode glyph (▶ / ‖) that sits on the text baseline like any other character.', 'radio' ); ?>
+                    </li>
+                    <li>
+                        <span class="ver">v0.3.1</span> &mdash; 29 May 2026<br>
                         <?php esc_html_e( 'My Radio layout polish + dropped dark-auto. Player no longer stretches edge-to-edge (max-width 880px); volume slider fixed width so the % label sits next to it; station dropdown capped at 360px; play-button icon shrunk to match the button text baseline; intro paragraph now fits one line. Removed the prefers-color-scheme dark-auto behaviour that was unreadable against WordPress\'s still-white postbox; theme=dark is still available as an explicit choice and now gives the player its own dark surface so it actually reads.', 'radio' ); ?>
                     </li>
                     <li>

inc/admin-page.php

@@ -50,7 +50,7 @@ function radio_render_main_page() {
 
                     <div class="radio-player__controls">
                         <button type="button" class="button button-primary radio-player__play" data-radio-play>
-                            <span class="dashicons dashicons-controls-play" aria-hidden="true"></span>
+                            <span class="radio-player__play-glyph" data-radio-play-glyph aria-hidden="true">&#9654;</span>
                             <span data-radio-play-label><?php esc_html_e( 'Play', 'radio' ); ?></span>
                         </button>
 

inc/dashboard-widget.php

@@ -43,7 +43,7 @@ function radio_render_dashboard_widget() {
 
         <div class="radio-player__controls">
             <button type="button" class="button button-primary radio-player__play" data-radio-play>
-                <span class="dashicons dashicons-controls-play" aria-hidden="true"></span>
+                <span class="radio-player__play-glyph" data-radio-play-glyph aria-hidden="true">&#9654;</span>
                 <span data-radio-play-label><?php esc_html_e( 'Play', 'radio' ); ?></span>
             </button>