fix(search): match primary phases by their words, not exact labels

The secondary-only filters were hidden for an exact set of lowercased
labels, so a change of case, hyphen or spacing in a GIAS phase label
would have left them showing. Phases are now matched on their words, as
compareGroups already reads "primary".

The E2E journey no longer counts school types: it asserts that choosing
one leaves the same list on offer, whatever the data holds. A test now
pins that a filter with no options is left out, not shown with only its
"any" option.

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

nextjs-app/components/FilterBar.tsx

@@ -69,10 +69,19 @@ type FilterKey = (typeof FILTER_KEYS)[number];
 /** Filters that only mean something for schools teaching beyond primary. */
 const SECONDARY_ONLY_KEYS = ["gender", "has_sixth_form", "admissions_policy"] as const;
 
-/** Phases with no secondary-age pupils, for which those filters are hidden. */
-const PRIMARY_PHASES = new Set(["primary", "nursery", "middle deemed primary"]);
-
-const hasSecondaryFilters = (phase: string) => !PRIMARY_PHASES.has(phase.toLowerCase());
+/**
+ * False for a phase with no secondary-age pupils, for which those filters are
+ * hidden: Primary, Nursery and Middle deemed primary. Matched on the words,
+ * not exact labels, so a change of case, hyphen or spacing in the GIAS label
+ * cannot leave them showing. The same reading of "primary" as
+ * compareGroups in lib/compareLogic.ts. The API's PHASE_GROUPS answers a
+ * different question (which phases a phase filter returns: primary includes
+ * all-through), so it is not this list.
+ */
+function hasSecondaryFilters(phase: string): boolean {
+  const p = phase.toLowerCase().replace(/[^a-z]+/g, " ").trim();
+  return !(p === "nursery" || (p.includes("primary") && !p.includes("secondary")));
+}
 
 function SlidersIcon() {
   return (