fix: key threads on the canonical URL, and space the header box

SITEURL is empty in this config, so rendering the thread key into the template
produced a relative path. Threads would have been keyed on /pastfetch.html and
orphaned the moment the site moved or gained a prefix. The page computes
location.origin + location.pathname instead, which is unambiguous and needs no
configuration.

The fill in the REPLIES header ran straight into the count, which read as
'────0 messages'. Every other box on the board keeps a space there.

randogoth.com/bbs/static/bbs.js

@@ -255,7 +255,11 @@ var BBS = {};
   function init() {
     var box = document.getElementById('replies');
     if (!box) return;
-    var host = box.dataset.host, site = box.dataset.site, url = box.dataset.url;
+    var host = box.dataset.host, site = box.dataset.site;
+    // The thread key is the canonical page URL, taken from the page rather than
+    // rendered in: SITEURL is empty in this config, which would key every
+    // thread on a relative path and break the moment the site moved.
+    var url = location.origin + location.pathname;
     var token = null;
 
     function esc(s) {
@@ -296,7 +300,7 @@ var BBS = {};
       var title = ' REPLIES ';
       var tail = count === 1 ? '1 message ' : count + ' messages ';
       var left = '┌─' + title;
-      var right = tail + '─┐';
+      var right = ' ' + tail + '─┐';
       return '<pre class="box">' + esc(left) + fill(W - left.length - right.length) + esc(right) + '</pre>';
     }
 

randogoth.com/bbs/templates/article.html

@@ -26,7 +26,6 @@
     JS the section simply is not there, which is honest, and the capsule never
     sees it at all since Gemini has no way to render it. -#}
 {%- if COMMENTS_HOST %}
-<div id="replies" data-host="{{ COMMENTS_HOST }}" data-site="{{ COMMENTS_SITE }}"
+<div id="replies" data-host="{{ COMMENTS_HOST }}" data-site="{{ COMMENTS_SITE }}"></div>
-     data-url="{{ SITEURL }}/{{ article.url }}"></div>
 {%- endif %}
 {% endblock %}