🧪 labsite: Fix link and mobile layout issues (#438)

Fix link and mobile layout issues and lab.evy.dev. The link to the playground
was incorrect in the sidebar (/playground rather than /play), now fixed.

Additionally shared links on mobile didn't work, the output display didn't show.
CSS tweaked for this too.

This merges the following commits:
* labsite: Fix link to playground
* labsite: Fix lab share links for mobile

     frontend/lab/css/overrides.css | 2 +-
     frontend/lab/index.html        | 2 +-
     2 files changed, 2 insertions(+), 2 deletions(-)

Pull-request: #438

frontend/lab/css/overrides.css

@@ -254,7 +254,7 @@ a.youtube {
     }
   }
   /* 1 column layout */
-  .main:has(.notes.hidden, .editorWrap.hidden) {
+  .main:has(> .notes.hidden):has(> .editor-wrap.hidden) {
     &.view-output {
       translate: 0;
     }

frontend/lab/index.html

@@ -140,7 +140,7 @@ <h1>👋 Welcome!</h1>
       </header>
       <ul>
         <li><button id="sidebar-about">About Evy</button></li>
-        <li><a href="/playground" target="_blank">Playground</a></li>
+        <li><a href="/play" target="_blank">Playground</a></li>
         <li><a href="/docs" target="_blank">Docs</a></li>
         <li><a href="/discord" target="_blank">Discord</a></li>
         <li><a href="/gallery" target="_blank">Gallery</a></li>