fix(humanize): preserve timeout: 0 semantics

[Iams4kura]

Summary

• Fixes: Ready Page and ElementHandle actions fail before their first actionability check when callers pass Playwright's timeout: 0 option, even though zero is documented to disable the timeout.
• Root cause: Each action converted the raw numeric timeout directly into Date.now() + timeout. That collapsed raw zero into an already-expired deadline, while forwarding numeric remaining values also made it impossible to distinguish a genuinely exhausted finite budget from Playwright's special zero value.

Regression evidence

• Before: cd js && npx --yes node@20 node_modules/vitest/vitest.mjs run tests/humanize.test.ts -t 'keeps a ready humanized page action timeout-free' exited 1

• After: cd js && npx --yes node@20 node_modules/vitest/vitest.mjs run tests/humanize.test.ts -t 'keeps a ready humanized page action timeout-free' exited 0

Verification

• cd js && npx --yes node@20 node_modules/vitest/vitest.mjs run tests/humanize.test.ts
• cd js && npx --yes node@20 node_modules/vitest/vitest.mjs run
• cd js && npx --yes node@20 node_modules/typescript/bin/tsc
• cd js && npx --yes node@20 node_modules/typescript/bin/tsc --noEmit

Scope

• 6 files changed, +285 / -139 lines