website: AA on the shell's copied button and group label

Measured on the deployed M3 page: .btn-primary 4.01:1 (white on --blue, 13.6px/600)
and .nav-group-label 3.14:1 (--text-3), both under the 4.5 floor.

This is R-930 arriving a second time by a different route: fixing .cta-button on
the website did not fix the CONTROLLER's button, and the shell imports it. Same
remedy the operator already chose - 1.2rem/700 puts the label in WCAG's large-text
band where 3:1 applies - so --blue stays untouched.

The sidebar's own CTA becomes an OUTLINE button rather than a filled one: blue on
transparent passes comfortably, and a 19.2px filled button does not fit a 240px
sidebar without wrapping. Measured both ways rather than guessed.

The controller has both defects on its own surface. Not fixed here - that repo is
read-only this session - so it is going to the register.

website/en/testing.html

@@ -37,7 +37,7 @@
     }
     </script>
     <!-- shared assets: bump ?v= together on any site.css/icons.svg change -->
-    <link rel="stylesheet" href="/assets/site.css?v=17">
+    <link rel="stylesheet" href="/assets/site.css?v=18">
     <link rel="icon" type="image/png" href="/assets/logo_favicon_2.svg">
     <script defer src="https://stats.felhom.eu/script.js" data-website-id="d419db57-5e1c-48df-bdb3-c29f25fb1661"></script>
 </head>