api-style(feat[badges]): Apply dense and dotted-underline modifiers

why: Signature-row badges read more cleanly when dense; the dotted underline
gives the label a quiet visual rhythm without implying a link. The shared
Tier A modifiers (SAB.DENSE, SAB.UNDERLINE_DOTTED) already exist in
sphinx-ux-badges and are already in production use by sphinx-autodoc-fastmcp
(with NO_UNDERLINE). No CSS change required.
what:
- Append SAB.DENSE and SAB.UNDERLINE_DOTTED to both modifier and type
  BadgeSpec class tuples in build_badge_group().
- Existing 43 api-style tests continue to pass (their `in` assertions
  tolerate the added classes).

Author: tony

packages/sphinx-autodoc-api-style/src/sphinx_autodoc_api_style/_badges.py

@@ -143,7 +143,13 @@ def build_badge_group(
             BadgeSpec(
                 _MOD_LABELS[mod],
                 tooltip=_MOD_TOOLTIPS[mod],
-                classes=(SAB.BADGE, SAB.BADGE_MOD, _MOD_CSS[mod]),
+                classes=(
+                    SAB.BADGE,
+                    SAB.BADGE_MOD,
+                    SAB.DENSE,
+                    SAB.UNDERLINE_DOTTED,
+                    _MOD_CSS[mod],
+                ),
                 fill=fill,
             )
         )
@@ -155,7 +161,13 @@ def build_badge_group(
             BadgeSpec(
                 label,
                 tooltip=tooltip,
-                classes=(SAB.BADGE, SAB.BADGE_TYPE, SAB.obj_type(objtype)),
+                classes=(
+                    SAB.BADGE,
+                    SAB.BADGE_TYPE,
+                    SAB.DENSE,
+                    SAB.UNDERLINE_DOTTED,
+                    SAB.obj_type(objtype),
+                ),
             )
         )