Remove mesa dependency from dev group and add it to docs group

Author: adamamer20

pyproject.toml

@@ -79,6 +79,7 @@ docs = [
   "perfplot>=0.10.2",
   "seaborn>=0.13.2",
   "sphinx-autobuild>=2025.8.25",
+  "mesa>=3.2.0",
 ]
 
 # dev = test ∪ docs ∪ extra tooling
@@ -88,7 +89,6 @@ dev = [
   "numba>=0.60.0",
   "ruff>=0.11.12",
   "pre-commit>=4.2.0",
-  "mesa>=3.2.0",
 ]