fix empty-value sorting edge cases and simplify sort components

e2e/utils/table.ts

@@ -15,6 +15,16 @@ export async function getTableRowNames(table: Locator): Promise<string[]> {
     return names;
 }
 
+/**
+ * The visual order of the given seeded names within the table, ignoring any other rows.
+ */
+export async function getSeededRowOrder(table: Locator, seeded: string[]): Promise<string[]> {
+    const rowNames = await getTableRowNames(table);
+    return rowNames
+        .map((rowName) => seeded.find((name) => rowName.includes(name)))
+        .filter((name): name is string => Boolean(name));
+}
+
 /**
  * Drop a table's persisted sort/filter state so a test starts from the defaults.
  */