Explore: a filter bar, and Explore the answers on the Statistics page

The explore page has a filter bar to type filters in (client, name or it and below, view, type, result, blocked), starting from the current filters and suggesting values from what is shown, so taking every filter out no longer means going back. The Statistics page opens it with Explore the answers.

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

docs/stats.md

@@ -213,7 +213,11 @@ which shows, for what you clicked:
 * the latest 100 answers, every cell a link.
 
 So "external, NXDOMAIN" leads to the clients asking, a client to everything
-it asks, one of its names to who else asks for it. Filters combine (this
+it asks, one of its names to who else asks for it. The page also opens
+from **Explore the answers** at the top of the Statistics page, and has a
+filter bar to type filters in: a client, a name (or it and the names below
+it), a view, a record type, a result, blocked or not; it suggests values
+from what is shown. Filters combine (this
 client, in this view, blocked only) and each has a ✕ to take it out. A name
 can be widened to the names below it (`domain=`). The Statistics page's
 view switches apply here too.