feat(0.6.3): discreet "buy me a coffee" support link

Tiny footer line inside the Updates panel on Settings + matching line
at the bottom of the Credits + thanks card on About. Pulled from a
single RADIO_SUPPORT_URL constant so both stay in sync. Conditional
render — if the constant is empty, the link is silently hidden, so
forks can strip funding with one line.

Design intent: muted (12px, admin-theme-coloured, subtle top divider).
Reads as housekeeping not a sales pitch — no yellow BMC brand chrome.
Dark-theme divider override so it stays subtle on the dark surface.

Files: radio.php (version, RADIO_SUPPORT_URL constant default
https://buymeacoffee.com/davidtkeane), inc/updater.php (link in
Updates panel), inc/about.php (link in Credits + thanks card; rotate
v0.6.3 → latest, v0.6.2 → earlier list), assets/css/radio.css
(.radio-support-link + dark-theme override), CHANGELOG.md.

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

inc/about.php

@@ -65,6 +65,11 @@ function radio_render_about_page() {
                 <p>
                     <?php esc_html_e( 'Plugin author: David Keane. Part of the RangerHQ plugin family. GPL v2 or later. Source on Gitea.', 'radio' ); ?>
                 </p>
+                <?php if ( defined( 'RADIO_SUPPORT_URL' ) && RADIO_SUPPORT_URL ) : ?>
+                    <a class="radio-support-link" href="<?php echo esc_url( RADIO_SUPPORT_URL ); ?>" target="_blank" rel="noopener">
+                        <?php esc_html_e( 'Like Radio? If You fancy to buy me a coffee →', 'radio' ); ?>
+                    </a>
+                <?php endif; ?>
             </div>
 
         </div><!-- /.radio-about-grid -->
@@ -74,14 +79,15 @@ function radio_render_about_page() {
             <h2><?php esc_html_e( 'Version history', 'radio' ); ?></h2>
 
             <div class="radio-about-versions__latest">
-                <span class="ver">v0.6.2</span> &mdash; 30 May 2026 <span class="latest"><?php esc_html_e( 'latest', 'radio' ); ?></span>
+                <span class="ver">v0.6.3</span> &mdash; 30 May 2026 <span class="latest"><?php esc_html_e( 'latest', 'radio' ); ?></span>
                 <p>
-                    <?php esc_html_e( 'Current version badge on the Settings page. A small grey pill follows the "Radio — Settings" heading so the version you are running is visible at a glance — no need to hover the plugin in Plugins → Installed or open the About page to check.', 'radio' ); ?>
+                    <?php esc_html_e( 'Discreet "buy me a coffee" support link. Tiny footer line inside the Updates panel on Settings, and a matching line in the Credits + thanks card on this About page. Muted styling, admin-theme-coloured link, sits below the existing content as housekeeping rather than a sales pitch. Pulled from a single RADIO_SUPPORT_URL constant so both spots stay in sync.', 'radio' ); ?>
                 </p>
             </div>
 
             <h3><?php esc_html_e( 'Earlier releases', 'radio' ); ?></h3>
             <ul class="radio-about-versions__earlier">
+                <li><span class="ver">v0.6.2</span> <span class="ver-date">30 May 2026</span> &mdash; <?php esc_html_e( 'Current version badge on the Settings page', 'radio' ); ?></li>
                 <li><span class="ver">v0.6.1</span> <span class="ver-date">30 May 2026</span> &mdash; <?php esc_html_e( 'About page restructure — balanced 3-card top row + compact version history', 'radio' ); ?></li>
                 <li><span class="ver">v0.6.0</span> <span class="ver-date">30 May 2026</span> &mdash; <?php esc_html_e( 'Pop-out mini-player — continuous background play across admin navigation', 'radio' ); ?></li>
                 <li><span class="ver">v0.5.0</span> <span class="ver-date">29 May 2026</span> &mdash; <?php esc_html_e( 'Track history + favourites (Spotify / YouTube / Apple Music / Bandcamp search links)', 'radio' ); ?></li>

inc/updater.php

@@ -195,6 +195,12 @@ function radio_render_updates_panel() {
         <p style="margin:10px 0 0; color:#646970; font-size:12px;">
             <?php esc_html_e( 'Manual update path: download the .zip, deactivate the plugin in WordPress, upload via Plugins → Add New → Upload, reactivate. Your settings survive the upgrade (state is stored in user_meta).', 'radio' ); ?>
         </p>
+
+        <?php if ( defined( 'RADIO_SUPPORT_URL' ) && RADIO_SUPPORT_URL ) : ?>
+            <a class="radio-support-link" href="<?php echo esc_url( RADIO_SUPPORT_URL ); ?>" target="_blank" rel="noopener">
+                <?php esc_html_e( 'Like Radio? If You fancy to buy me a coffee →', 'radio' ); ?>
+            </a>
+        <?php endif; ?>
     </div>
 
     <script>