Show SABnzbd's queue in the header on every page

Adds a live download figure next to the header clock, present on
every page (not just Activity/System). It's populated by the same
/api/sabnzbd poll those pages already use, extended to run
unconditionally and to fill in a new #head-dl span — never a
server-rendered fetch, so an unreachable SABnzbd can't add latency to
pages that don't otherwise touch it. Quiet ink at "0 IN QUEUE" when
idle, live cyan with a speed reading once something's moving.

static/css/teletext.css

@@ -33,7 +33,6 @@
   text-transform: uppercase;
 }
 .tt-head-clock {
-  margin-left: auto;
   color: var(--live);
   white-space: nowrap;
   min-width: 0;
@@ -45,6 +44,16 @@
   letter-spacing: 0.3em;
 }
 .tt-entry[hidden] { display: none; }
+/* SABnzbd's queue, live on every page — filled in by service.js, empty
+   (and so invisible) until its first poll returns. Quiet ink when
+   idle; the live colour only while something is actually moving. */
+.tt-head-dl {
+  margin-left: auto;
+  color: var(--ink-dim);
+  white-space: nowrap;
+  min-width: 0;
+}
+.tt-head-dl.live { color: var(--live); }
 
 /* ── Page ───────────────────────────────────────────────
    One measure for every page in the service. Nothing is ever
@@ -602,6 +611,7 @@ a.tt-row:focus-visible .tt-row-sub { color: var(--tt-black); }
   .tt-row-title { white-space: normal; }
   .tt-row-val { margin-left: auto; white-space: normal; }
   .tt-head-name { letter-spacing: 0.12em; }
+  .tt-head-dl { margin-left: 0; flex-basis: 100%; }
   .tt-head-clock { margin-left: 0; flex-basis: 100%; }
 
   /* The System disk table swaps for its row reflow here — see the