Fix Admin Notices not showing on the Dashboard (v2.4.2)

admin_notices fires everywhere, but prints inside #wpbody, which
DashboardTakeover hides entirely on the Dashboard (to hide the *native*
dashboard, not ours) — notices went down with it as collateral damage.
Notices::render_for_dashboard() now renders directly inside the visible
dashboard frame instead, called from DashboardTakeover::render_mount();
the normal admin_notices path bails on the Dashboard so it isn't
rendered twice.

Second, independent bug found along the way: wp-admin/js/common.js
unconditionally relocates every .notice element on the page to right
after the page's <h1>, regardless of where it was placed server-side —
without opting out, it would've silently moved our notice right back
into the hidden #wpbody. Used core's own documented `below-h2` class to
opt out, only for the dashboard render path.

Verified live: notice now shows correctly inside the dashboard frame
with proper dark styling, and dismisses correctly.

Co-Authored-By: Claude Sonnet 5 <[email protected]>

app/src/shell/shell-frame.css

@@ -376,6 +376,21 @@ html.aurora-has-taskbar #site-editor {
   border-top-right-radius: var(--aurora-radius-lg);
 }
 
+/* Custom admin notices (Notices::render_for_dashboard(), reparented in
+   here by windowChrome.js) — native-dark.css already themes .notice
+   elsewhere via #wpbody-content, but that stylesheet isn't loaded on the
+   Dashboard at all (Shell::is_own_page() treats index.php as one of
+   Aurora's own pages), so it needs its own copy of the same treatment
+   here instead. */
+#aurora-admin-dashboard-notices:empty {
+  display: none;
+}
+#aurora-admin-dashboard-notices .notice {
+  background: var(--aurora-card-bg);
+  color: var(--aurora-text);
+  margin: 16px 20px 0;
+}
+
 /* Yellow dot: on the Dashboard itself there's nowhere further "home" to
    send it, so minimize just collapses the frame down to the title bar in
    place — everywhere else, minimize navigates to the dashboard instead