Fire Docs Visited Plausible event on every docs page view

[lencioni]

Summary

Companion to happo/happo-view#3812 for HAP-852.

Fires a Docs Visited Plausible custom event whenever the user lands on or navigates to a page under docs.happo.io. This lets us use docs visits as a top-of-funnel goal in Plausible (alongside Pricing Viewed, Trial Signup, etc.) so we can measure conversion rate by source rather than raw visits.

Implementation

• Adds the onRouteDidUpdate client-module lifecycle hook so the event fires on both initial load and client-side route changes.
• Skips firing on hash/query-only changes (same pathname as previous).
• Sends path as a Plausible custom prop so we can break the event down by section of the docs.
• The Plausible tracker library is still lazy-loaded once and init() is called only once; subsequent navigations reuse the cached module via a memoized getTracker() promise.

Test plan

• Build the site locally and confirm the event fires in Plausible's "test events" view on initial load and on client navigations
• Confirm no extra event fires on hash navigations within the same page

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