fix(mobile): Ask-MSOS pill yields to cookie/language banners

In in-app browsers (Instagram/Facebook) the floating pill (z-index 9999, same
as the cookie banner) sat on top of the cookie Accept button and the language
banner, so consent could not be tapped. The pill now hides whenever the
cookie-consent (.msos-cc) or language (.lang-suggest) banner is present, via a
MutationObserver on <body>, and reappears once they are dismissed. With the
pill yielding, the language banner is dropped back to the bottom edge.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

assistant.js

@@ -321,6 +321,19 @@
         root.querySelector(".msa-x").addEventListener("click", close);
         root.querySelector(".msa-form").addEventListener("submit", function (e) { e.preventDefault(); submit(); });
         document.addEventListener("keydown", function (e) { if (e.key === "Escape" && opened) close(); });
+
+        // Yield to bottom-anchored overlays (cookie-consent banner, language
+        // banner) so the launcher never sits on top of their action buttons —
+        // important in in-app browsers (Instagram/Facebook) where everything
+        // stacks at the bottom. The pill reappears once they are dismissed.
+        (function () {
+            function overlayUp() {
+                return !!document.querySelector(".msos-cc") || !!document.querySelector(".lang-suggest");
+            }
+            function sync() { root.classList.toggle("msa-hidden", overlayUp()); }
+            try { new MutationObserver(sync).observe(document.body, { childList: true }); } catch (e) {}
+            sync();
+        })();
     }
 
     if (document.readyState !== "loading") build();