sphinx-autodoc-fastmcp(fix[badges]): suppress dotted underline on safety/tool badges

why: The live-demo badges on
<https://gp-sphinx.git-pull.com/packages/sphinx-autodoc-fastmcp/#live-demos>
(and the Gallery page) carried a dotted underline under the label
text that was visually noisy and read as a link affordance. The
decoration is a deliberate default of the `sab-dense` badge variant
in `sphinx-ux-badges`, where `.sab-badge.sab-dense .sab-badge-label`
sets `text-decoration: underline dotted` — explicitly designed to be
overridable via the shipped modifier classes (`sab-no-underline`,
`sab-underline`, `sab-underline-solid`, `sab-underline-dotted`)
which the `SAB` enum already exposes at
`sphinx-ux-badges/_css.py:87-91`. Using the designed escape hatch
lets us keep every other visual property of the dense variant
(compact metrics, 1 px bordered pill, tooltip, icon) while dropping
only the text decoration, and keeps the change local to fastmcp —
pytest-fixtures and api-style don't even use `sab-dense`, so they're
unaffected.
what:
- Compose `SAB.NO_UNDERLINE` alongside `SAB.DENSE` in the four
  badge-builder call sites in
  `sphinx-autodoc-fastmcp/_badges.py`:
  - `build_safety_badge` — `[SAB.DENSE, SAB.NO_UNDERLINE, …]`
  - `build_type_tool_badge` — `[SAB.DENSE, SAB.NO_UNDERLINE, …]`
  - `build_tool_badge_group` (safety spec) — `(SAB.DENSE, SAB.NO_UNDERLINE, …)`
  - `build_tool_badge_group` (type spec) — `(SAB.DENSE, SAB.NO_UNDERLINE, …)`
- Update `test_fastmcp_tool_prototype_snapshot` (the one snapshot
  covering the assembled tool-card doctree) to reflect the new class
  list — existing `in` assertions in `test_fastmcp.py` still pass
  since they don't check class-set equality
- No changes to `sphinx-ux-badges`, no new CSS, no new API — the
  override mechanism (`classes` on `build_badge`/`BadgeSpec` + the
  `SAB.NO_UNDERLINE` constant) was already public surface

Verified via `just build-docs`: rendered fastmcp badges now carry
`sab-badge sab-dense sab-no-underline …`; pytest-fixtures and
api-style badges remain untouched.

Author: tony

packages/sphinx-autodoc-fastmcp/src/sphinx_autodoc_fastmcp/_badges.py

@@ -62,7 +62,12 @@ def build_safety_badge(
     style: t.Literal["full", "icon-only", "inline-icon"] = (
         "icon-only" if icon_only else "full"
     )
-    classes = [SAB.DENSE, _CSS.BADGE_SAFETY, _CSS.safety_class(safety)]
+    classes = [
+        SAB.DENSE,
+        SAB.NO_UNDERLINE,
+        _CSS.BADGE_SAFETY,
+        _CSS.safety_class(safety),
+    ]
     return build_badge(
         text,
         tooltip=_SAFETY_TOOLTIPS.get(safety, f"Safety: {safety}"),
@@ -84,7 +89,7 @@ def build_type_tool_badge() -> BadgeNode:
     return build_badge(
         "tool",
         tooltip=_TYPE_TOOLTIP,
-        classes=[SAB.DENSE, SAB.BADGE_TYPE, _CSS.TYPE_TOOL],
+        classes=[SAB.DENSE, SAB.NO_UNDERLINE, SAB.BADGE_TYPE, _CSS.TYPE_TOOL],
     )
 
 
@@ -112,12 +117,17 @@ def build_tool_badge_group(safety: str) -> nodes.inline:
                 safety if safety in _SAFETY_LABELS else safety,
                 tooltip=_SAFETY_TOOLTIPS.get(safety, f"Safety: {safety}"),
                 icon=_SAFETY_ICONS.get(safety, ""),
-                classes=(SAB.DENSE, _CSS.BADGE_SAFETY, _CSS.safety_class(safety)),
+                classes=(
+                    SAB.DENSE,
+                    SAB.NO_UNDERLINE,
+                    _CSS.BADGE_SAFETY,
+                    _CSS.safety_class(safety),
+                ),
             ),
             BadgeSpec(
                 "tool",
                 tooltip=_TYPE_TOOLTIP,
-                classes=(SAB.DENSE, SAB.BADGE_TYPE, _CSS.TYPE_TOOL),
+                classes=(SAB.DENSE, SAB.NO_UNDERLINE, SAB.BADGE_TYPE, _CSS.TYPE_TOOL),
             ),
         ],
     )

tests/ext/layout/__snapshots__/test_snapshots.ambr

@@ -256,10 +256,10 @@
               <api_component classes="api-layout-right sab-toolbar" name="api-layout-right" tag="div">
                   <api_inline_component classes="api-badge-container" name="api-badge-container" tag="span">
                       <inline classes="sab-badge-group">
-                          <BadgeNode badge_icon="🔍" badge_tooltip="Read-only — does not modify external state" classes="sab-badge sab-dense smf-badge--safety smf-safety-readonly" tabindex="0">
+                          <BadgeNode badge_icon="🔍" badge_tooltip="Read-only — does not modify external state" classes="sab-badge sab-dense sab-no-underline smf-badge--safety smf-safety-readonly" tabindex="0">
                               readonly
 
-                          <BadgeNode badge_tooltip="MCP tool" classes="sab-badge sab-dense sab-badge--type smf-type-tool" tabindex="0">
+                          <BadgeNode badge_tooltip="MCP tool" classes="sab-badge sab-dense sab-no-underline sab-badge--type smf-type-tool" tabindex="0">
                               tool
       <desc_content classes="api-content">
           <api_component classes="api-description api-region api-region--narrative" name="api-description" tag="div">