refactor(assets): build logo/favicon URLs via withOriginBaseUrl helper

Swap the logo/favicon URL constants from the inline
`${trimTrailingSlash(import.meta.env.BASE_URL)}/public/res/...` form to the
repo's existing `withOriginBaseUrl(getOriginBaseUrl(), '/public/res/...')`
helper (already used here for the OIDC callback URL). Functionally equivalent —
same /public/res/ target, resolves in dev and the static-copied prod build — and
it keeps the logo URL absolute and consistent with clientUri for the OIDC
logoUri. No build-config change (publicDir stays false).

Co-authored-by: Nathan Vititoe <nathanvititoe@gmail.com>
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/app/pages/client/WelcomePage.tsx

@@ -1,10 +1,10 @@
 import React from 'react';
 import { Box, Button, Icon, Icons, Text, config, toRem } from 'folds';
 import { Page, PageHero, PageHeroSection } from '../../components/page';
-import { trimTrailingSlash } from '../../utils/common';
+import { getOriginBaseUrl, withOriginBaseUrl } from '../pathUtils';
 import pkg from '../../../../package.json';
 
-const LotusLogo = `${trimTrailingSlash(import.meta.env.BASE_URL)}/public/res/Lotus.png`;
+const LotusLogo = withOriginBaseUrl(getOriginBaseUrl(), '/public/res/Lotus.png');
 
 export function WelcomePage() {
   return (