fix(analytics): stop duplicate GA4 page_view events

[tannerlinsley]

The analytics bootstrap could execute twice on one page load, configuring GA4 twice and inserting two loaders. Make initialization run once and send initial and navigation page views only from PageViewTracker, skipping unresolved and repeated paths.

Includes Jonny Hislop's patch and documents that GA4 history-based page measurement must remain disabled. The GA4 admin setting has not been verified.

Validation: pnpm test passed (TypeScript, lint, 525 unit tests passed, 3 skipped). Focused execution checks passed for repeated bootstrap execution, initial page views, repeated effects, navigation, query changes, and return navigation.

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• .agents/analytics.md
• src/routes/__root.tsx

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