[Feature] Use nullish coalescing for wait default to preserve explicit falsy values

[EmmaYuan1015]

Summary

Replace truthy-based wait defaults with nullish coalescing so explicit falsy values like 0 are preserved instead of falling back to the default delay.

Changes

• update src/common/utils.ts to use time ?? 2000 in wait
• update test/smoke/suites/helper/waitHelper.ts to use time ?? 2000 in wait

Why

The previous time ? time : 2000 logic treated 0 as “not provided”, which changed the caller’s intent and could introduce unexpected delays.

Validation

• ran npm run build