fix: Update notebooks to use public_marts schema

dbt creates mart tables in public_marts schema, not public.
Updated all notebook SQL queries to use the correct schema.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

notebooks/safety/crime_breakdown_bar.ipynb

@@ -47,8 +47,8 @@
     "    homicide_count,\n",
     "    total_incidents,\n",
     "    crime_rate_per_100k\n",
-    "FROM mart_neighbourhood_safety\n",
-    "WHERE year = (SELECT MAX(year) FROM mart_neighbourhood_safety)\n",
+    "FROM public_marts.mart_neighbourhood_safety\n",
+    "WHERE year = (SELECT MAX(year) FROM public_marts.mart_neighbourhood_safety)\n",
     "ORDER BY total_incidents DESC\n",
     "LIMIT 15\n",
     "\"\"\"\n",