fix active page handling

[seanmcguire12]

why

• when new tabs were opened via a popup, chromeTabs.activeTargetId() was pointing to the correct target ID, but stagehand didn't have time to register that target in its registry
• this caused lookup to fail, and activePage() to return undefined

what changed

• added polling with a max of 3 seconds inside activePage()

test plan

• added tests for delayed page registration

---

Summary by cubic

Fixes a race where popups activated by user gesture were not returned by activePage(). The method now polls for up to 3s for Chrome’s active target to be registered and throws a clear timeout if it never is.

• Bug Fixes
  • V3Context.activePage() polls until the active target’s Page is registered; returns undefined when Chrome has no active target; throws a TimeoutError after 3s if never registered.
  • Added tests for delayed registration, no-active-target, and timeout; updated the SDK smoke test to use context.activePage() and removed the custom waitForNewPage helper.

^{Written for commit 7361091. Summary will update on new commits.}

[changeset-bot]

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Latest commit: 7361091

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