feat(14.2.1-03): add markdown and multilingual cabana fields

Lift locale maps before ProjectWritableFields so a Journal-shaped save can persist the default host scalar and non-default locales through TranslationWriter without dropping nested JSON.

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

admin/src/components/form/mlLocale.ts

@@ -0,0 +1,24 @@
+/** Window event that keeps every ML control on one active locale. */
+export const ML_LOCALE_CHANGE = 'summer:ml-locale'
+
+/** Broadcast the locale the administrator selected on any ML control. */
+export function broadcastMLLocale(locale: string): void {
+  if (typeof window === 'undefined' || locale === '') {
+    return
+  }
+  window.dispatchEvent(new CustomEvent(ML_LOCALE_CHANGE, { detail: locale }))
+}
+
+/** Locale → text map as it is sent on save: only string values. */
+export function localeRecord(value: unknown): Record<string, string> {
+  const out: Record<string, string> = {}
+  if (value === null || typeof value !== 'object' || Array.isArray(value)) {
+    return out
+  }
+  for (const [locale, text] of Object.entries(value as Record<string, unknown>)) {
+    if (typeof text === 'string') {
+      out[locale] = text
+    }
+  }
+  return out
+}