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/auth/oidc/oidcConfig.ts

@@ -1,9 +1,8 @@
 import type { OidcRegistrationClientMetadata } from 'matrix-js-sdk';
-import { trimTrailingSlash } from '../../../utils/common';
 import { OIDC_CALLBACK_PATH } from '../../paths';
 import { getOriginBaseUrl, withOriginBaseUrl } from '../../pathUtils';
 
-const LotusLogo = `${trimTrailingSlash(import.meta.env.BASE_URL)}/public/res/Lotus.png`;
+const LotusLogo = withOriginBaseUrl(getOriginBaseUrl(), '/public/res/Lotus.png');
 
 /**
  * Absolute URL the OIDC provider redirects back to after authorization.