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>

CHANGELOG.md

@@ -68,7 +68,9 @@ All notable changes to Jarl are documented here. The format follows
   an explore page for it: answers over time, the top clients, names,
   views, types, results and blocklists among them (each a link that
   narrows it further), and the latest answers. "NXDOMAIN in external" →
-  the clients asking → everything one of them asks. `GET /stats/explore`.
+  the clients asking → everything one of them asks. A filter bar types
+  filters in, and **Explore the answers** opens the page from the
+  Statistics page. `GET /stats/explore`.
 - **Storage** on the dashboard: the size of Jarl's databases (and how many
   answers the query log holds), and per disk Jarl uses a bar of how full it
   is and how much of it the databases take. The Statistics page shows the