feat(core): convert stats card to TypeScript

[marcalexiei]

Another step of #140.

• src/cards/stats.js + its test ➡️ .ts.
• Moved createTextNode out of the stats card into common/render.js (next to the other SVG-node builders).
  It was the one card export used by another card (repo).
• I18n gained a default type param (usable as a bare type),
  and Card/createTextNode accept the possibly-undefined options cards forward.
• Card tests now use the screen API instead of getByTestId(document.body, …).
  See recommended query entrypoint and cache repeated queries in local variables.
  Also applied on the already-migrated gist/repo tests.

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