fix(theme): render app-shell on desktop Chromium via ::details-content (0.2.1)

Chromium >=121 wraps a <details>'s content in a generated ::details-content
box with content-visibility:hidden while closed. The SSR app-shell ships
closed (no JS) and hides its summary toggle at lg+, so on desktop the rail+page
were invisible and the flex-lg-row layout collapsed to a vertical stack.

Add '.app-shell::details-content { display: contents }' inside the lg+ media
query: dissolving the wrapper box reveals the content regardless of open state
and restores rail/page as direct flex children of .app-shell. Browsers without
::details-content support drop the invalid selector and fall back to the legacy
force-show. Mobile (<lg) and nested NavRailSection disclosures unaffected.

Bump 0.2.0 -> 0.2.1.

ZB.MOM.WW.Theme/Directory.Build.props

@@ -4,7 +4,7 @@
     <Nullable>enable</Nullable>
     <ImplicitUsings>enable</ImplicitUsings>
     <LangVersion>latest</LangVersion>
-    <Version>0.2.0</Version>
+    <Version>0.2.1</Version>
     <ManagePackageVersionsCentrally>true</ManagePackageVersionsCentrally>
   </PropertyGroup>
 </Project>