@

feat(runbackup): open record link in new window; harden leave warning

- The "View backup record" link on the pre-update completion screen now
  opens in a new window (target=_blank rel=noopener), so viewing the
  record does not leave the "Continue the update" flow.
- beforeunload leave-warning now also returns the message (broader browser
  support) so closing the window mid-backup reliably prompts a warning.

Claude-Session: https://claude.ai/code/session_01WbGBN9VyRK61zczYWcCQ2i
@

source/packages/com_mokosuitebackup/tmpl/runbackup/default.php

@@ -132,7 +132,7 @@ $this->getDocument()->addStyleSheet(Uri::root(true) . '/media/com_mokosuitebacku
 
 			<div id="msb-rb-actions" class="d-none mt-3">
 				<button type="button" id="msb-rb-retry" class="btn btn-primary d-none"></button>
-				<a href="#" id="msb-rb-record" class="btn btn-primary d-none"></a>
+				<a href="#" id="msb-rb-record" class="btn btn-primary d-none" target="_blank" rel="noopener"></a>
 				<a href="#" id="msb-rb-continue" class="btn btn-warning d-none"></a>
 				<a href="<?php echo $dashboardUrl; ?>" id="msb-rb-dashboard" class="btn btn-secondary d-none"></a>
 			</div>
@@ -316,9 +316,15 @@ $this->getDocument()->addStyleSheet(Uri::root(true) . '/media/com_mokosuitebacku
 		}
 	}
 
-	/* Warn before leaving while a backup is mid-flight. */
+	/* Warn before closing/leaving the window while a backup is mid-flight.
+	   Return the message too — some browsers need it, others show a generic
+	   prompt, but any non-empty value triggers the confirmation dialog. */
 	window.addEventListener('beforeunload', function (e) {
-		if (running) { e.preventDefault(); e.returnValue = L.leaveWarn || ''; }
+		if (!running) { return undefined; }
+		var msg = L.leaveWarn || 'A backup is in progress. Leaving now will cancel it.';
+		e.preventDefault();
+		e.returnValue = msg;
+		return msg;
 	});
 
 	if (CFG.autostart) {