Explore: several values per filter, !value to leave one out, *.domain

Each explore filter takes several values, comma separated (any of them), !value to leave one out, and *.example.com for a name and the names below it. Every value is a chip with its own ✕; clicking a value in the lists adds it, and hide leaves it out. The filter bar's fields take lists. domain= still works.

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

internal/web/static/assets/style.css

@@ -619,3 +619,6 @@ table.recent-queries td.oneline-cell { max-width: 40ch; white-space: nowrap; ove
 form.explore-filters { display: flex; flex-wrap: wrap; gap: 6px 12px; align-items: center; }
 form.explore-filters label { color: var(--muted); display: inline-flex; gap: 6px; align-items: center; }
 .explore-filter-panel { padding-top: 10px; padding-bottom: 10px; }
+.chip.filter-chip.not strong { text-decoration: line-through; }
+.bar-list a.bar-hide { font-size: 11px; color: var(--muted); margin-right: 4px; text-decoration: none; opacity: 0.6; }
+.bar-list li:hover a.bar-hide, .bar-list a.bar-hide:focus { opacity: 1; text-decoration: underline; }