feat: instrument ViewedAPIDocumentation with standardized properties

[nkotolenko-cpu]

Summary

Replaces the code-side `WPAPIDocsPageViewed` rename plugin with the correct event name set at the SDK config level (`ViewedAPIDocumentation`), and adds an enrichment plugin that attaches Whitepages-standardized event properties to every Amplitude event fired from the docs site.

Changes

• `src/lib/amplitude.ts`: remove `renameEventsEnrichmentPlugin` (which was renaming `[Amplitude] Page Viewed` → `WPAPIDocsPageViewed`); switch `pageViews: true` to `pageViews: { trackHistoryChanges: "all", eventType: "ViewedAPIDocumentation" }`; add `whitepagesPropertiesPlugin` that appends `PathName`, `Url`, `ReferringUrl`, `ReferringSite`, and `PageType: "APIDocumentation"` to all events — additive, preserving existing `[Amplitude] Page *` autocapture properties
• `commitlint.config.js`: fix pre-existing ESM syntax (`export default`) incompatible with the CJS loader used by commitlint

Verification

On `bun run preview` (open-next + wrangler, mirrors production):

• Navigate between two docs pages
• DevTools → Network → filter `amplitude`: confirm POST payloads contain `event_type: "ViewedAPIDocumentation"`
• Confirm each event has `PathName`, `Url`, `ReferringUrl`, `ReferringSite`, `PageType: "APIDocumentation"` in `event_properties`
• Confirm `[Amplitude] Page *` autocapture properties are still present alongside the new ones

Ticket: SMB-1310

[lhagenWP]

This function returning an empty string does make particular sense. Allowing this to throw an exception seems more reasonable.

[lhagenWP]

The referring site is not "" it is undefined.

[lhagenWP]

This seems like something that the Amplitude package would return an enumeration for.

[nkotolenko-cpu]

Addressed all three comments (force-pushed):

• extractHostname: removed the try/catch and the helper entirely. document.referrer is spec-guaranteed to be either an empty string or a valid absolute URL, so new URL() won't throw on it.
• ReferringSite: "": switched to a conditional spread so the key is omitted entirely when there's no referrer, rather than set to an empty string.
• trackHistoryChanges: "all": checked the installed package — PageTrackingHistoryChanges is exported from @amplitude/analytics-core as a string literal union type ('all' | 'pathOnly'), not an enum. The string literal is the correct and idiomatic usage.