test(e2e): improve page-ref test robustness

e2e-tests/page-refs.spec.ts

@@ -61,6 +61,7 @@ async function alias_test (page, page_name: string){
   await page.keyboard.press(hotkeyBack)
 
   // clicking opening test
+  await page.waitForSelector('.page-blocks-inner .ls-block .page-ref >> nth=-1')
   await page.click('.page-blocks-inner .ls-block .page-ref >> nth=-1')
   await lastInnerBlock(page)
   expect(await page.inputValue(':nth-match(textarea, 1)')).toBe(alias_test_content_3)

e2e-tests/utils.ts

@@ -46,10 +46,10 @@ export async function lastInnerBlock(page: Page): Promise<Locator> {
     // discard any popups
     await page.keyboard.press('Escape')
     // click last block
+    await page.waitForSelector('.page-blocks-inner .ls-block >> nth=-1')
     await page.click('.page-blocks-inner .ls-block >> nth=-1')
     // wait for textarea
     await page.waitForSelector(':nth-match(textarea, 1)', { state: 'visible' })
-
     return page.locator(':nth-match(textarea, 1)')
 }