fix: defaults from defaults.bootstrap

Author: gadenbuie

examples/brand/_brand.yml

@@ -103,10 +103,12 @@ typography:
     decoration: "underline"
 
 defaults:
+  bootstrap:
+    my-pink: "$brand-pink"
   shiny:
     theme:
       preset: shiny
       rules: |
-        .navbar-brand { color: $brand-pink }
+        .navbar-brand { color: $my-pink }
       # TODO: Find an appropriate theme variable to set
       # navbar-bg: $brand-purple

shiny/ui/_theme_brand.py

@@ -257,14 +257,14 @@ def _brand_defaults_bootstrap(brand: Brand) -> BrandBootstrapConfigFromYaml:
 
         bootstrap: dict[str, Any] = brand.defaults["bootstrap"]
         defaults: dict[str, Any] = {
-            k: v for k, v in bootstrap if k not in ("version", "preset")
+            k: v for k, v in bootstrap.items() if k not in ("version", "preset")
         }
 
         return BrandBootstrapConfigFromYaml(
             path="defaults.bootstrap",
             version=bootstrap.get("version"),
             preset=bootstrap.get("preset"),
-            **defaults,
+            defaults=defaults,
         )