refactor: update app code for domain-scoped schema migration

- Update dbt model references to use new schema naming (stg_toronto, int_toronto, mart_toronto)
- Refactor figure factories to use consistent column naming from new schema
- Update callbacks to work with refactored data structures
- Add centralized design tokens module for consistent styling
- Streamline CLAUDE.md documentation

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

dbt/models/intermediate/toronto/_intermediate.yml

@@ -5,11 +5,11 @@ models:
     description: "Rental data enriched with time and zone dimensions"
     columns:
       - name: rental_id
-        tests:
+        data_tests:
           - unique
           - not_null
       - name: zone_code
-        tests:
+        data_tests:
           - not_null
 
   - name: int_neighbourhood__demographics
@@ -17,11 +17,11 @@ models:
     columns:
       - name: neighbourhood_id
         description: "Neighbourhood identifier"
-        tests:
+        data_tests:
           - not_null
       - name: census_year
         description: "Census year"
-        tests:
+        data_tests:
           - not_null
       - name: income_quintile
         description: "Income quintile (1-5, city-wide)"
@@ -31,7 +31,7 @@ models:
     columns:
       - name: neighbourhood_id
         description: "Neighbourhood identifier"
-        tests:
+        data_tests:
           - not_null
       - name: year
         description: "Reference year"
@@ -45,11 +45,11 @@ models:
     columns:
       - name: neighbourhood_id
         description: "Neighbourhood identifier"
-        tests:
+        data_tests:
           - not_null
       - name: year
         description: "Statistics year"
-        tests:
+        data_tests:
           - not_null
       - name: crime_rate_per_100k
         description: "Total crime rate per 100K population"
@@ -61,7 +61,7 @@ models:
     columns:
       - name: neighbourhood_id
         description: "Neighbourhood identifier"
-        tests:
+        data_tests:
           - not_null
       - name: year
         description: "Reference year"
@@ -75,11 +75,11 @@ models:
     columns:
       - name: neighbourhood_id
         description: "Neighbourhood identifier"
-        tests:
+        data_tests:
           - not_null
       - name: year
         description: "Survey year"
-        tests:
+        data_tests:
           - not_null
       - name: avg_rent_2bed
         description: "Weighted average 2-bedroom rent"