feat(publish): auto-localize Leaflet CDN to platform assets

Ship Leaflet 1.9.4 under public/assets/leaflet and rewrite common CDN script/stylesheet URLs during publish and public HTML delivery, matching the existing Chart.js guard pattern.

Co-authored-by: Cursor <cursoragent@cursor.com>

server/portal-workspace-publication-delivery.mjs

@@ -27,7 +27,7 @@ import {
   publishedPageCsp,
 } from '../mindspace-published-page-csp.mjs';
 import {
-  rewriteKnownCdnScriptSources,
+  rewriteKnownCdnAssetSources,
 } from '../mindspace-published-script-localize.mjs';
 import {
   injectOgTags,
@@ -188,7 +188,7 @@ export function createPortalWorkspacePublicationDelivery({
     }
 
     let html =
-      rewriteKnownCdnScriptSources(
+      rewriteKnownCdnAssetSources(
         delivery.html,
       ).html;
     html = preparePublicHtmlAssetDelivery(