New UI: Ensure there's single element to click

[mirekdlugosz]

.locator() can match multiple elements on the page. .locator().click() works in strict mode, i.e. Playwright will refuse the operation if .locator() matches multiple elements. This is a change compared to .click(locator_string), which would happily operate on first element matching the locator_string.

Using .first between .locator() and .click() ensures there's single element to operate on.

This fixes a bug that is only present when running some tests on empty database. Which happens to be a case in pipeline.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 76.85%. Comparing base (ac9ff64) to head (b508263). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #545 +/- ## ======================================= Coverage 76.85% 76.85% ======================================= Files 7 7 Lines 700 700 ======================================= Hits 538 538 Misses 162 162 ```

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