Fix theme and template configuration

Author: N2D4

packages/stack-shared/src/config/schema.ts

@@ -812,6 +812,8 @@ export async function sanitizeEnvironmentConfig<T extends EnvironmentRenderedCon
 export async function sanitizeOrganizationConfig(config: OrganizationRenderedConfigBeforeSanitization) {
   assertNormalized(config);
   const prepared = await sanitizeEnvironmentConfig(config);
+  const themes: typeof prepared.emails.themes = config.emails.server.isShared ? DEFAULT_EMAIL_THEMES : prepared.emails.themes;
+  const templates: typeof prepared.emails.templates = config.emails.server.isShared ? DEFAULT_EMAIL_TEMPLATES : prepared.emails.templates;
   const products = typedFromEntries(typedEntries(prepared.payments.products).map(([key, product]) => {
     const isAddOnTo = product.isAddOnTo === false ?
       false as const :
@@ -835,7 +837,9 @@ export async function sanitizeOrganizationConfig(config: OrganizationRenderedCon
     ...prepared,
     emails: {
       ...prepared.emails,
-      selectedThemeId: has(prepared.emails.themes, prepared.emails.selectedThemeId) ? prepared.emails.selectedThemeId : DEFAULT_EMAIL_THEME_ID,
+      selectedThemeId: has(themes, prepared.emails.selectedThemeId) ? prepared.emails.selectedThemeId : DEFAULT_EMAIL_THEME_ID,
+      themes,
+      templates,
     },
     payments: {
       ...prepared.payments,