Harden server draft sync (Save & Exit + post-login transfer)

messages/en/create/draftHydration.json

@@ -0,0 +1,4 @@
+{
+  "loadingSavedProgress": "Loading your saved progress…",
+  "conflictPrompt": "You have progress saved in this browser and a draft on your account.\n\nOK — load the account draft (discard the browser copy).\nCancel — keep this browser copy."
+}

messages/en/create/topNav.json

@@ -2,5 +2,6 @@
   "saveAndExit": "Save & Exit",
   "exit": "Exit",
   "leaveConfirmLoss": "Leave create flow? Your progress will be lost.",
-  "leaveConfirmSaveFailed": "Could not save to your account. Leave anyway?"
+  "draftSaveBannerTitle": "Couldn't save draft",
+  "postLoginSaveFailedWithReason": "Could not save your draft to your account. Your progress is still stored on this device.\n\n{reason}"
 }