docs(_ext[sab_demo]): Fix mypy dict type-arg on setup()

why: CI runs mypy . (whole workspace) but local ran mypy src tests;
dict return annotation needs generic args to pass strict type-arg check.
what:
- Add import typing as t
- Annotate setup() return type as dict[str, t.Any]

Author: tony

docs/_ext/sab_demo.py

@@ -7,6 +7,8 @@
 
 from __future__ import annotations
 
+import typing as t
+
 from docutils import nodes
 from sphinx.application import Sphinx
 from sphinx.util.docutils import SphinxDirective
@@ -140,7 +142,7 @@ def _row(*badge_nodes: nodes.Node, label: str = "") -> nodes.paragraph:
         return result
 
 
-def setup(app: Sphinx) -> dict:
+def setup(app: Sphinx) -> dict[str, t.Any]:
     """Register the ``sab-badge-demo`` directive."""
     app.add_directive("sab-badge-demo", BadgeDemoDirective)
     app.add_css_file("css/sab_demo.css")