style(badges): Use dotted underline on fixture badges

why: The dotted underline signals that badges have tooltip text on
hover, matching the browser convention for abbr[title] elements.
what:
- Change text-decoration from none to underline dotted on abbr.spf-badge

Author: tony

packages/sphinx-autodoc-pytest-fixtures/src/sphinx_autodoc_pytest_fixtures/_static/css/sphinx_autodoc_pytest_fixtures.css

@@ -288,7 +288,7 @@ dl.py.fixture > dt .spf-badge-group {
 abbr.spf-badge {
   border-bottom-style: solid;
   border-bottom-width: var(--spf-badge-border-w, 1px);
-  text-decoration: none;
+  text-decoration: underline dotted;
 }
 abbr.spf-badge--fixture { border-color: var(--spf-fixture-border); }
 abbr.spf-scope-session  { border-color: var(--spf-scope-session-border); }