feat(editorial): validate publications and preserve partial event updates

src/messages/en.json

@@ -1237,7 +1237,9 @@
 					"restoreRevision": "Restore into editor",
 					"confirmRevision": "Replace the current editor content with this previous version as a draft? Review it and choose a publication status before saving.",
 					"editConflict": "This article changed after you opened it. Your changes were not applied. Copy your work, reload the article, and merge the changes before saving again.",
-					"retryRecovery": "Reload recovery without changing this form"
+					"retryRecovery": "Reload recovery without changing this form",
+					"imageInvalid": "Use a local image path or an HTTP/HTTPS image URL without credentials.",
+					"linksInvalid": "Review the content links: only local, HTTP/HTTPS and email links are allowed."
 				},
 				"articlesShown": "Articles shown",
 				"latest": "Latest article",
@@ -4332,6 +4334,19 @@
 				"start": "Start synchronization",
 				"description": "Synchronization runs in the background. Progress and safe retries remain in your import history after you leave this page.",
 				"failed": "Could not queue synchronization"
+			},
+			"publicationPreflight": {
+				"affectedPages": "Affected public pages",
+				"scheduleInvalid": "Choose a valid start or publication date. An event end must follow its start.",
+				"description": "Checks use the current form values. Remote image and link availability is not tested.",
+				"slugNormalized": "The public address will use the normalized slug shown below.",
+				"imageInvalid": "Use a local image path or an HTTP/HTTPS image URL without credentials.",
+				"imageMissing": "No cover image selected. The page will use its fallback.",
+				"title": "Publication checks",
+				"ready": "Image, links and schedule passed the local checks.",
+				"linksInvalid": "Review the content links: only local, HTTP/HTTPS and email links are allowed.",
+				"schedulePast": "The selected date is in the past. Review it before publishing.",
+				"previewHint": "These links show the current public pages. Use Preview to check unsaved content. The final article slug may receive a suffix if already in use."
 			}
 		},
 		"mod": {
@@ -4674,5 +4689,10 @@
 				"excludedConflicts": "{count, plural, one {# item needs review and is excluded from this import.} other {# items need review and are excluded from this import.}}"
 			}
 		}
+	},
+	"publicData": {
+		"loadError": "This section could not be loaded. Please try again.",
+		"retry": "Retry",
+		"unavailable": "Unavailable"
 	}
 }