fix(webapp): stop CopyButton nesting a button inside its tooltip trigger

The button variant rendered a real <button> inside the tooltip trigger's own
<button>. The browser parser splits nested buttons apart, so React failed to
hydrate any page showing one. The trigger now adopts the button itself.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

Author: samejr

apps/webapp/app/components/primitives/CopyButton.tsx

@@ -99,6 +99,11 @@ export function CopyButton({
         content={copied ? "Copied!" : "Copy"}
         className="font-sans"
         disableHoverableContent
+        // The button variant is a real <button>; without asChild the tooltip
+        // trigger wraps it in its own, and the browser parser splits the nested
+        // buttons apart, which React then fails to hydrate.
+        asChild={variant === "button"}
+        tabbable={variant === "button"}
       />
     </span>
   );