feat: capture page_url in events

[khushi1033]

Background

• Events currently don't capture page_url, so we have no visibility into where on a site an event was fired.
• This PR adds the capability to capture page_url from the client, and is related to PR1 and PR2— the mPServer PRs that handles the new field on the backend, propagating, sanitizing, and gating it for safety in case the URL contains PII.

What Has Changed

• Bumped @mparticle/event-models to ^1.3.0 (adds page_url?: string on CommonEventData).
• Added optional PageUrl?: string to the internal SDKEvent interface.
• Captured on the standard createEventObject path and on the createBackgroundASTEvent path. External callers using the toEventAPIObject escape hatch own the full event shape and are not modified
• convertBaseEventData maps sdkEvent.PageUrl → page_url in the events-API payload.
• New tests cover converter mapping (set + omitted) and capture-time behavior; existing fixtures left as-is since PageUrl is optional.

Screenshots/Video

Checklist

• I have performed a self-review of my own code.
• I have made corresponding changes to the documentation.
• I have added tests that prove my fix is effective or that my feature works.
• I have tested this locally.

Additional Notes

• {Any additional information or context relevant to this PR}

Reference Issue (For employees only. Ignore if you are an outside contributor)

• Closes https://go/j/[ticket-number]

[cursor]

PR Summary

Medium Risk
Every event now includes the full browser URL, which can carry query-string PII until server-side sanitization; the change touches the core event upload path but is additive and optional on the wire.

Overview
This PR adds page URL capture on outgoing web SDK events so analytics can see where on the site each event fired.

@mparticle/event-models is bumped to ^1.3.0 (dev + peer), aligning with page_url on CommonEventData. The internal SDKEvent type gains optional PageUrl, set from window.location.href when events are built in createEventObject and for background application-state-transition events in batchUploader. convertBaseEventData maps PageUrl → page_url on every converted event payload.

Tests assert capture at event creation, page_url on converted batches (including AST), and that page_url is omitted when PageUrl is unset.

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[sonarqubecloud]

Quality Gate failed

Failed conditions
45.4% Duplication on New Code (required ≤ 3%)

See analysis details on SonarQube Cloud

[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

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[alexs-mparticle]

I see you're importing event-models but they don't look like they're being used.