feat(ux): 8 UX improvements — simpler home, advanced filters, phase tabs, 4-line rows

1. Simpler home page: only search box on landing, no filter dropdowns
2. Advanced filters: hidden behind toggle on results page, auto-open if active
3. Per-school phase rendering: each row renders based on its own data
4. Taller 4-line rows with context line (type, age range, denomination, gender)
5. Result-scoped filters: dropdown values reflect current search results
6. Fix blank filter values: exclude empty strings and "Not applicable"
7. Rankings: Primary/Secondary phase tabs with phase-specific metrics
8. Compare: Primary/Secondary tabs with school counts and phase metrics

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

nextjs-app/components/HomeView.tsx

@@ -108,6 +108,7 @@ export function HomeView({ initialSchools, filters, totalSchools }: HomeViewProp
       <FilterBar
         filters={filters}
         isHero={!isSearchActive}
+        resultFilters={initialSchools.result_filters}
       />
 
       {/* Discovery section shown on landing page before any search */}
@@ -257,7 +258,7 @@ export function HomeView({ initialSchools, filters, totalSchools }: HomeViewProp
           <>
             <div className={styles.schoolList}>
               {sortedSchools.map((school) => (
-                isSecondaryView || school.attainment_8_score != null ? (
+                school.attainment_8_score != null ? (
                   <SecondarySchoolRow
                     key={school.urn}
                     school={school}