Fix Android updates dialog, mobile About page, and user color crash guard.

Use stripBase for update static copy paths, show Settings detail on mobile
when nav is hidden, pause Settings focus trap during release notes, and guard
extractMemberColorPreference when room is not a Matrix Room instance.

src/app/features/settings/about/About.tsx

@@ -21,6 +21,9 @@ export function About({ requestClose }: AboutProps) {
   const [version, setVersion] = useState<string>('');
   const [protocolStatus, setProtocolStatus] = useState<string>('Checking desktop protocol integration...');
   const [protocolBusy, setProtocolBusy] = useState<boolean>(false);
+  const [updatePreview, setUpdatePreview] = useState<{ title: string; description: string } | null>(
+    null
+  );
 
   const formatProtocolStatus = useCallback((data: {
     scheme: string;
@@ -101,8 +104,6 @@ export function About({ requestClose }: AboutProps) {
     getCurrentUpdatePreview().then(setUpdatePreview).catch(() => setUpdatePreview(null));
   }, [refreshProtocolStatus]);
 
-  const [updatePreview, setUpdatePreview] = useState<{ title: string; description: string } | null>(null);
-
   return (
     <Page>
       <PageHeader outlined={false}>