Fix narrow format test expectations for Playwright 1.58.2 / newer Chromium ICU

[Copilot]

Playwright 1.58.2 ships a newer Chromium with updated ICU data that produces shorter narrow style strings from Intl.RelativeTimeFormat — dropping abbreviation periods and spaces (e.g. in 1 hr. → in 1h, in 1 min. → in 1m, 3 wk. ago → 3w ago).

Changes

• test/relative-time.js — Update 15 narrow formatStyle expectations to match the new ICU output:

  Old	New
  in 50 sec.	in 50s
  in 1 min. / 1 min. ago	in 1m / 1m ago
  in 1 hr. / 1 hr. ago	in 1h / 1h ago
  in 3 wk. / 3 wk. ago	in 3w / 3w ago
  in 2 yr.	in 2y

• src/duration-format-ponyfill.ts — Add as const to the 'unit' string literal to satisfy the stricter Intl.NumberFormat overload resolution introduced by the updated TypeScript version:

  // Before
  {style: 'unit', unit: nfUnit, unitDisplay: unitStyle}
  // After
  {style: 'unit' as const, unit: nfUnit, unitDisplay: unitStyle}

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