fix(client): accept copied event market URLs

[cesarenaldi]

Summary

• accept copied market URLs shaped like /event/{slug} in fetchMarket(url: ...)
• also supports selected-market URLs shaped like /event/{eventSlug}/{marketSlug} by using the final slug
• update market URL examples and the existing market URL integration test

Verification

• pnpm lint
• pnpm typecheck
• pnpm test:client:integration packages/client/tests/integration/markets.test.ts

---

Note

Low Risk
Localized URL parsing for market lookup only; no auth or API contract changes beyond accepting additional user input shapes.

Overview
fetchMarket({ url }) now accepts Polymarket links copied from the site that use the /event/... path, not only /market/{slug}.

parsePolymarketSlugUrl gains a market-specific branch: when resolving a market, /event/{slug} uses that segment as the market slug, and /event/{eventSlug}/{marketSlug} prefers the second segment when present (at most one extra path segment). Other shapes still fail with UserInputError. Docs/examples and the integration test were updated to use event-style URLs; the negative test now rejects a tag URL instead of a plain event URL.

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