feat: truncate tooltip

src/css/charts.scss

@@ -143,5 +143,12 @@
 			margin-right: 8px;
 			border-radius: 2px;
 		}
+
+		.tooltip-label {
+			max-width: 100px;
+			overflow: hidden;
+			text-overflow: ellipsis;
+			white-space: nowrap;
+		}
 	}
 }