fix(rankings,admissions): correct accuracy issues from education audit

Follow-up audit of the rankings and admissions pages.

Admissions (AdmissionsView.tsx):
- National Offer Day no longer claims offers publish "from 12:01 am";
  release times are set per-council (often late afternoon, some
  overnight), so it now tells parents to check their council's page.
- Secondary preference count no longer states a flat "up to six"
  (that's London/Pan-London); most LAs allow three to six. Mirrors the
  hedge the primary step already used.
- Added the two deadlines that most often catch parents out: selective
  schools' separate entrance-test registration (months earlier), and
  faith schools' supplementary information form sent direct to the
  school. Covered in both the primary and secondary criteria steps.
- Reworded the equal-preference tip so it's precise: order is the
  tie-break among schools you qualify for (you get the highest-ranked
  one), not irrelevant.

Rankings (RankingsView.tsx):
- Subtitle "Top-performing schools by X" -> "Schools ranked by X", so
  it isn't nonsensical for context/equity/absence metrics.
- KS2 progress isn't published for 2023/24 or 2024/25 (no KS1
  baseline). Selecting a primary progress metric on a recent year used
  to dead-end on a generic "No rankings found". Added a scoped caveat
  to the progress hint and an explanatory empty-state (primary only —
  secondary Progress 8 is published).

Added an admissions smoke journey (static content, stable milestones).
Verified with tsc --noEmit and next build.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0146VHeLAWjDVE2B5uU67jCB

nextjs-app/components/AdmissionsView.tsx

@@ -61,7 +61,7 @@ interface Step {
 const SECONDARY_STEPS: Step[] = [
   {
     title: 'Check entry criteria',
-    body: 'Look at each school\'s admissions policy — catchment areas, faith criteria, sibling priority, and aptitude tests vary widely.',
+    body: 'Look at each school\'s admissions policy — catchment areas, faith criteria, sibling priority, and aptitude tests vary widely. Two deadlines catch parents out: grammar and other selective schools need separate entrance-test registration months earlier (often by September), and faith schools often want a supplementary information form sent directly to the school alongside the council application.',
     tool: { label: 'Find schools & view their admissions history', href: '/' },
   },
   {
@@ -73,14 +73,14 @@ const SECONDARY_STEPS: Step[] = [
   {
     date: '31 October',
     title: 'Application deadline',
-    body: 'Submit your ranked list of up to six schools. Councils treat all preferences equally — list schools in the genuine order you want them, not strategically.',
+    body: 'Submit your ranked list of schools — most councils allow three to six preferences (London boroughs typically six). Councils treat all preferences equally, so list schools in the genuine order you want them, not strategically.',
     highlight: 'deadline',
     tool: { label: 'Compare performance to order your preferences', href: '/rankings' },
   },
   {
     date: '1 March',
     title: 'National Offer Day',
-    body: 'Results are published online, usually from 12:01 am. You\'ll receive an email or letter with your allocated school.',
+    body: 'Your allocated school appears on the council\'s online admissions portal and is sent by email. Release times are set by each council — often from late afternoon, though some publish overnight — so check your council\'s page rather than refreshing at midnight.',
     highlight: 'offer',
     tool: { label: 'Look up your allocated school', href: '/' },
   },
@@ -100,7 +100,7 @@ const SECONDARY_STEPS: Step[] = [
 const PRIMARY_STEPS: Step[] = [
   {
     title: 'Research entry criteria',
-    body: 'Faith schools, language units, and distance-based catchments differ by school. Start by reading each school\'s admissions policy on their website or the council\'s website.',
+    body: 'Faith schools, language units, and distance-based catchments differ by school. Start by reading each school\'s admissions policy — and note that faith schools often require a supplementary information form sent directly to the school, in addition to the council application.',
     tool: { label: 'Find schools & view their admissions history', href: '/' },
   },
   {
@@ -144,7 +144,7 @@ interface Tip {
 const TIPS: Tip[] = [
   {
     heading: 'Equal preference rule',
-    body: 'Councils rank offers by your eligibility for each school, not by the order you listed them. You cannot game the system — put schools in the order you actually want them.',
+    body: 'Councils consider every school you list before making any offer, then give you the highest-ranked one you qualify for. Your order only decides which qualifying school you get — you can\'t game it, so list schools in the order you genuinely want them.',
   },
   {
     heading: 'Late applications go to the back',