refactor(phase): merge KS2+KS4 into fact_performance, fix all phase inconsistencies

Root cause: the UNION ALL query in data_loader.py produced two rows per
all-through school per year (one KS2, one KS4), with drop_duplicates()
silently discarding the KS4 row. Fixes:

- New dbt mart `fact_performance`: FULL OUTER JOIN of fact_ks2_performance
  and fact_ks4_performance on (urn, year). One row per school per year.
  All-through schools have both KS2 and KS4 columns populated.
- data_loader.py: replace 175-line UNION ALL with a simple JOIN to
  fact_performance. No more duplicate rows or drop_duplicates needed.
- sync_typesense.py: single LATERAL JOIN to fact_performance instead of
  two separate KS2/KS4 joins.
- app.py: remove drop_duplicates (no longer needed); add PHASE_GROUPS
  constant so all-through/middle schools appear in primary and secondary
  filter results (were previously invisible to both); scope result_filters
  gender/admissions_policies to secondary schools only.
- HomeView.tsx: isSecondaryView is now majority-based (not "any secondary")
  and isMixedView shows both sort option sets for mixed result sets.
- school/[slug]/page.tsx: all-through schools route to SchoolDetailView
  (renders both SATs + GCSE sections) instead of SecondarySchoolDetailView
  (KS4-only). Dedicated SEO metadata for all-through schools.

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

pipeline/scripts/sync_typesense.py

@@ -58,24 +58,14 @@ QUERY_BASE = """
     LEFT JOIN marts.dim_location l ON s.urn = l.urn
 """
 
-QUERY_KS2_JOIN = """
+QUERY_PERFORMANCE_JOIN = """
     LEFT JOIN LATERAL (
-        SELECT rwm_expected_pct
-        FROM marts.fact_ks2_performance
+        SELECT rwm_expected_pct, progress_8_score
+        FROM marts.fact_performance
         WHERE urn = s.urn
         ORDER BY year DESC
         LIMIT 1
-    ) ks2 ON true
-"""
-
-QUERY_KS4_JOIN = """
-    LEFT JOIN LATERAL (
-        SELECT progress_8_score
-        FROM marts.fact_ks4_performance
-        WHERE urn = s.urn
-        ORDER BY year DESC
-        LIMIT 1
-    ) ks4 ON true
+    ) p ON true
 """
 
 
@@ -136,30 +126,23 @@ def sync(typesense_url: str, api_key: str):
     schema = {**COLLECTION_SCHEMA, "name": collection_name}
     client.collections.create(schema)
 
-    # Fetch data from marts — dynamically include KS2/KS4 joins if tables exist
+    # Fetch data from marts — join fact_performance if it exists
     conn = get_db_connection()
     with conn.cursor(cursor_factory=psycopg2.extras.RealDictCursor) as cur:
-        # Check which fact tables exist
+        # Check whether the merged fact table exists
         cur.execute("""
             SELECT table_name FROM information_schema.tables
-            WHERE table_schema = 'marts' AND table_name IN ('fact_ks2_performance', 'fact_ks4_performance')
+            WHERE table_schema = 'marts' AND table_name = 'fact_performance'
         """)
-        existing_tables = {r["table_name"] for r in cur.fetchall()}
-
-        select_extra = []
-        joins = ""
-        if "fact_ks2_performance" in existing_tables:
-            select_extra.append("ks2.rwm_expected_pct")
-            joins += QUERY_KS2_JOIN
-        if "fact_ks4_performance" in existing_tables:
-            select_extra.append("ks4.progress_8_score")
-            joins += QUERY_KS4_JOIN
+        has_fact_performance = cur.fetchone() is not None
 
         query = QUERY_BASE
-        if select_extra:
-            # Insert extra select columns before FROM
-            query = query.replace("l.longitude as lng", "l.longitude as lng,\n        " + ",\n        ".join(select_extra))
-        query += joins
+        if has_fact_performance:
+            query = query.replace(
+                "l.longitude as lng",
+                "l.longitude as lng,\n        p.rwm_expected_pct,\n        p.progress_8_score",
+            )
+            query += QUERY_PERFORMANCE_JOIN
 
         cur.execute(query)
         rows = cur.fetchall()