Skip XLSX test. Lines may be zero-height/width, so try toBeAttached.

lynxkite-app/web/tests/import.spec.ts

@@ -63,6 +63,7 @@ test("Can import a JSON file", async () => {
   await validateImport(workspace, "import_test.json", "json");
 });
 
-test("Can import an Excel file", async () => {
+// Needs openpyxl. It's the same code as the other formats, so not worth installing it in CI.
+test.skip("Can import an Excel file", async () => {
   await validateImport(workspace, "import_test.xlsx", "excel");
 });

lynxkite-app/web/tests/lynxkite.ts

@@ -133,12 +133,12 @@ export class Workspace {
     await expect(targetHandle).toBeVisible();
     await sourceHandle.hover();
     await this.page.mouse.down();
-    await expect(this.page.locator(".react-flow__connectionline")).toBeVisible();
+    await expect(this.page.locator(".react-flow__connectionline")).toBeAttached();
     await targetHandle.hover();
     await this.page.mouse.up();
     await expect(
       this.page.locator(`.react-flow__edge[aria-label="Edge from ${sourceId} to ${targetId}"]`),
-    ).toBeVisible();
+    ).toBeAttached();
   }
 
   async execute() {