Show blocked counts on the Blocking page, and reveal + CNAME on hover

The Blocking page shows how many queries each blocklist, and the rules
together, blocked in the last 24 hours (with statistics on). The + CNAME
button on A/AAAA rows shows when the row is hovered or focused, and
always on touch screens.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

CHANGELOG.md

@@ -92,7 +92,11 @@ All notable changes to Jarl are documented here. The format follows
   reorder them; view links everywhere open the view's page.
 - Web UI: A and AAAA records have a **+ CNAME** button that fills in the
   add form with a CNAME pointing to the record's name, leaving only the
-  alias's name to type.
+  alias's name to type. It shows when the row is hovered or focused
+  (always on touch screens).
+- Blocking page: how many queries each blocklist blocked in the last 24
+  hours, and your rules together, with statistics on (linking to the
+  Statistics page).
 - Options are kept in one fixed order, in named.conf, the web UI and the
   CLI: grouped by topic (files, listening, access control, recursion and
   forwarding, DNSSEC, transfers and notify, then the rest), alphabetical