search.html clipboard monitor, Anki add note Playwright tests

[jbukl]

Tests for search.html's clipboard monitor and adding a note to Anki. Anki responses are mocked.

• Playwright tests for search.html and Anki add note (can add more note fields to test if wanted)
• Enable playwright experimental SW flag needed in order to intercept requests from service workers - for both the vscode playwright extension and for the GH action workflow
• Playwright manifest variant (extended off of chrome-dev) for playwright tests
• Playwright global setup/teardown to use playwright manifest variant - moves clipboardRead to required permissions
• Refactored a bit - extracted code from visual.spec.js to a new util file

notes/questions:

• The playwright manifest setup/teardown was added because I couldn't think of a way to use optional permissions - the permission popup would appear, and simply sit there until I either manually clicked it myself, or the test times out. Googling around, the best I could find were suspect hacks - e.g. simulating arrow key/enter clicks to hit OK on the popup. The solution I used might not be preferred, so explicitly pointing it out here.

• There's a couple places where I felt the need to add a waitForTimeout; I couldn't find a behavior to wait on instead. Can try harder to find UI behavior to wait on if desired, but so far I wasn't able to find anything.

• The current playwright config's actionTimeout is really long - would it be OK to just remove it (which would then default it to 10 seconds)? I haven't tested without it, but I can add in longer explicit timeouts wherever needed in place of it.

• Should audio download requests be mocked?

• Can use less CSS locators if preferred.

• The calls for toHaveScreenshot() in visual.spec.js seem to be causing the yomitan instance used by playwright to crash pretty often locally - don't personally have a fix for it or know for certain why.

[github-actions]

✔️ No visual differences introduced by this PR.

View Playwright Report (note: open the "playwright-report" artifact)