Fix empty print labels: apply dimensions in all media not just screen

Label width/height was inside @media screen so print had no dimensions.
Moved to base CSS so labels render in both screen preview and print.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/routes/(app)/devices/[id]/print/+page.svelte

@@ -25,25 +25,25 @@
 			size: 90.3mm 29mm;
 			margin: 1mm;
 		}
-		@media print {
-			.no-print { display: none !important; }
-			body {
-				margin: 0;
-				padding: 0;
-				background: white !important;
-			}
-			nav, header, aside { display: none !important; }
-			main { padding: 0 !important; overflow: visible !important; }
-			.print-container { break-inside: avoid; }
+		.label-preview {
+			width: 90.3mm;
+			height: 29mm;
+			background: white;
+			box-sizing: border-box;
+			overflow: hidden;
 		}
 		@media screen {
 			.label-preview {
 				border: 1px dashed #ccc;
-				width: 90.3mm;
-				height: 29mm;
-				background: white;
 			}
 		}
+		@media print {
+			.no-print { display: none !important; }
+			body { margin: 0; padding: 0; background: white !important; }
+			nav, header, aside { display: none !important; }
+			main { padding: 0 !important; overflow: visible !important; }
+			.print-container { break-inside: avoid; page-break-after: always; }
+		}
 	</style>
 </svelte:head>