feat(14.2.1-05): hydrate ML create/GET/save through TranslatedExact

Form schema meta lists enabled locales, Show/save expand mltext maps
without D-11 fallback, and the SPA seeds and adopt-merges every locale.

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

admin/src/components/form/formState.ts

@@ -92,8 +92,9 @@ export function presetValue(type: string, source: unknown): string {
     .replace(/^-+|-+$/g, '')
 }
 
-/** Initial values of a new record: schema defaults, toggles off, no ids. */
-export function initialValues(fields: FormField[]): AdminRecord {
+/** Initial values of a new record: schema defaults, toggles off, no ids.
+ * ML fields seed an empty string for every enabled locale. */
+export function initialValues(fields: FormField[], enabledLocales: readonly string[] = []): AdminRecord {
   const out: AdminRecord = {}
   for (const field of fields) {
     if (field.default !== undefined) {
@@ -103,12 +104,38 @@ export function initialValues(fields: FormField[]): AdminRecord {
     } else if (field.type === 'relation' && field.multiple) {
       out[field.name] = []
     } else if (field.type === 'mltext' || field.type === 'mlmarkdown') {
-      out[field.name] = {}
+      const seed: Record<string, string> = {}
+      for (const code of enabledLocales) {
+        seed[code] = ''
+      }
+      out[field.name] = seed
     }
   }
   return out
 }
 
+/** Content locales from form schema meta; empty when the writer is unpublished. */
+export function schemaEnabledLocales(meta: { enabledLocales?: readonly string[] } | null | undefined): readonly string[] {
+  return meta?.enabledLocales ?? []
+}
+
+/** Merge a GET/save ML value onto a seed map of every enabled locale. A host
+ * string becomes the first enabled locale; it never replaces sibling keys. */
+export function mergeMLValue(incoming: unknown, enabledLocales: readonly string[]): Record<string, string> {
+  const seeded: Record<string, string> = {}
+  for (const code of enabledLocales) {
+    seeded[code] = ''
+  }
+  if (typeof incoming === 'string') {
+    const fallback = enabledLocales[0]
+    if (fallback) {
+      seeded[fallback] = incoming
+    }
+    return seeded
+  }
+  return { ...seeded, ...localeRecord(incoming) }
+}
+
 /** D-10 422 details (field -> messages) as a string-list map. */
 export function fieldErrors(details: ErrorBody['details'] | undefined): Record<string, string[]> {
   const out: Record<string, string[]> = {}