feat(ui): render the page toast from the status store

ShellFeedback and the scene director show toasts through createToast(),
each on its own timer as before, and the scene chrome renders the toast.
Every show rewrites the text, so a repeated message is announced again.

scripts/qa-context-arrivals.mjs

@@ -474,12 +474,22 @@ async function contacts() {
 
   // SEARCH NEARBY SITES, as the user presses it.
   await page.evaluate(() => {
-    document.getElementById('toast').textContent = '';
+    const toast = document.getElementById('toast');
+    const before = toast.firstChild;
     document.getElementById('installations-search-btn').click();
+    window.__qaToastBefore = before;
   });
+  // Every toast show writes a new text node, even for a repeated message.
   await page
     .waitForFunction(
-      () => document.getElementById('toast').textContent.trim().length > 0,
+      () => {
+        const toast = document.getElementById('toast');
+        return (
+          toast.classList.contains('visible') &&
+          toast.firstChild !== window.__qaToastBefore &&
+          toast.textContent.trim().length > 0
+        );
+      },
       { timeout: 20_000 },
     )
     .catch(() => {});