complete story 4.3 adfter validation and fixing

lang/en/messages.php

@@ -29,4 +29,7 @@ return [
     'timeline_created' => 'Timeline created successfully.',
     'update_added' => 'Update added successfully.',
     'update_edited' => 'Update edited successfully.',
+    'timeline_archived' => 'Timeline has been archived.',
+    'timeline_unarchived' => 'Timeline has been unarchived.',
+    'cannot_update_archived_timeline' => 'Updates cannot be added to archived timelines.',
 ];

lang/en/timelines.php

@@ -50,4 +50,11 @@ return [
     // Validation messages for updates
     'update_text_required' => 'Please enter the update text.',
     'update_text_min' => 'The update must be at least 10 characters.',
+
+    // Archiving
+    'archive' => 'Archive',
+    'unarchive' => 'Unarchive',
+    'archive_confirm_title' => 'Archive Timeline',
+    'archive_confirm_message' => 'Are you sure you want to archive this timeline? No further updates can be added until it is unarchived.',
+    'archived_notice' => 'This timeline is archived. Updates are disabled.',
 ];