Thank you @krassowski!
Yes I have updated the package.json files, as I could't succeed in update from copier.... I understand now that the tag was missing.

Don´t bother starting the CI ... I have some new failures in my test version too... 🤔

I have fixed codemirror toparea-text-widget and shout-button

It looks like the codemirror test is flaky. In the recording it looks fine:

and it passed on Mac but failed (timed out waiting on await page.notebook.setCell) on Ubuntu.

I think it is an issue with galata's implementation of page.notebook.setCell - for code cells it waits for stable rendering:

https://github.com/jupyterlab/jupyterlab/blob/b4b496e9a0704da70266ade98bcd74929f15ee26/galata/src/helpers/notebook.ts#L1266-L1294

Maybe using a markdown cell in this test could help?

I think it is an issue with galata's implementation of page.notebook.setCell - for code cells it waits for stable rendering:

I guess this is the issue for toolbar-button too then (https://github.com/jupyterlab/extension-examples/actions/runs/16755565700/job/47482296812?pr=284#step:19:158).
In that case I cannot modify the cell type to 'markdown' as there is no output for markdown cells.
Should I modify galata?

toolbar-button looks different, it seems like a bug with the toolbar overflowing and overlapping the cell:

As a workaround maybe we should collapse the left sidebar? There is a method for it in galata/

Looking at kernel-output failure:

Error:   1) tests/kernel-output.spec.ts:3:5 › should open a panel connected to a notebook kernel ──────────
    Error: locator.selectOption: Test timeout of 120000ms exceeded.
    Call log:
      - waiting for locator('.jp-Dialog-body').locator('select')
        - locator resolved to <select class="jp-mod-styled">…</select>
      - attempting select option action
        2 × waiting for element to be visible and enabled
          - did not find some options
        - retrying select option action
        - waiting 20ms
        2 × waiting for element to be visible and enabled
          - did not find some options
        - retrying select option action
          - waiting 100ms
        219 × waiting for element to be visible and enabled
            - did not find some options
          - retrying select option action
            - waiting 500ms

I suspect the label no longer matches. Looking at this dialog it usually looks like:

I think we would need something like:

const select = page.locator('.jp-Dialog-body').locator('select');
const optionLocator = select.locator('option', { hasText: /Untitled.ipynb.*/ });
const value = await optionLocator.getAttribute('value');
await page.locator('.jp-Dialog-body').locator('select').selectOption({ value }); 

Well thank you @krassowski for your patience and your help!

Thank you @cmarmo and @krassowski, super cool to see the repo updated and the CI back to green!