panel: show the send log's status as a badge

The send log was the one place in the panel where a status was bare text, next
to a delivery's own page where the same value is a badge, and a domain list
where the DNS verdict is one too — so a message's outcome looked like a
different kind of fact depending on which page you read it from.

The level travels on the row rather than being worked out in the template:
deliveryLevel is the one place that decides what a status means, the delivery
page already reads it, and a second mapping written into the template or the
stylesheet would have been free to drift from it. sent is ok, deferred a
warning, bounced and rejected errors, and queued unknown — nothing has gone
wrong, nothing has been reported yet.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

CHANGELOG.md

@@ -28,7 +28,13 @@ Format follows [Keep a Changelog](https://keepachangelog.com/en/1.1.0/); version
   whose only card is the narrow one now takes its heading and footer down to the
   card's width instead of splitting them across the wider measure, and the send
   log stops breaking `Details` and `deferred` across two lines when a row is
-  tight. The three
+  tight.
+- panel: the send log's **status is a badge**, in the same ok/warn/error/unknown
+  colours the status page and the DNS checks use, instead of the one place in
+  the panel where a status was bare text. The mapping is the one the delivery
+  page already applied — `sent` is ok, `deferred` a warning, `bounced` and
+  `rejected` errors, `queued` unknown because nothing has gone wrong yet.
+  The three
   WOFF2 files add ~76 KB to the image and are served from the panel's own origin,
   so the Content-Security-Policy is unchanged (`default-src 'self'`).