make RSS feed link smaller and more subtle

Replace the full neobrutalism card with a compact inline row. The
URL is now clickable to copy, with a brief Copied! confirmation.

template/dashboard.html

@@ -62,15 +62,11 @@
             {{end}}
         </div>
 
-        <div class="nb-card rss-card">
-            <div class="nb-card-content">
-                <h4 class="nb-card-title">RSS Feed</h4>
-                <p class="nb-card-text">
-                    <code id="rss-url"></code>
-                    <span id="rss-url-src" hidden>{{.RSSURL}}</span>
-                    <button class="nb-button default" onclick="copyRSS()">Copy</button>
-                </p>
-            </div>
+        <div class="rss-row">
+            <span class="rss-label">RSS Feed</span>
+            <code id="rss-url" onclick="copyRSS()"></code>
+            <span id="rss-url-src" hidden>{{.RSSURL}}</span>
+            <span class="rss-copied" id="rss-copied" hidden>Copied!</span>
         </div>
 
         <script>
@@ -104,9 +100,9 @@
             document.getElementById('rss-url').textContent = rssURL;
             function copyRSS() {
                 navigator.clipboard.writeText(rssURL).then(() => {
-                    const btn = event.target;
-                    btn.textContent = 'Copied!';
-                    setTimeout(() => btn.textContent = 'Copy', 1500);
+                    const el = document.getElementById('rss-copied');
+                    el.hidden = false;
+                    setTimeout(() => el.hidden = true, 1500);
                 });
             }
         </script>