fix(browser-sync): reflect the step path in the address bar

[a22hobman]

Problem

useJourneyBrowserSync already computes each history entry's path (from the active top step — hooks.ts makeEntry), but every pushState/replaceState call passes "" as the URL argument and omits the path:

history.pushState(makeEntry({ position: positionRef.current }), "");   // no URL

When you call pushState/replaceState with no URL, the browser deliberately keeps the current address. So the location bar never updates on in-app navigation. Deep-linking and back/forward still work (state carries path, and popstate reconstructs from data.path), but:

• the visible URL stays stale as you drill, so you can't copy the bar to share a specific position;
• consumers that read window.location see stale segments — notably segment-based layout routers (e.g. strata, which cascades templates → slots → components off URL segments) would cascade off the wrong, stale path.

Fix

Pass the entry's path as the third pushState/replaceState argument at all four sync sites (initial replaceState, forward push, workspace-switch push, in-place replace). The history state shape is unchanged, so popstate reconstruction is unaffected; this only surfaces the path that was already being tracked.

Tests

• Updated the four browser-sync assertions to expect the URL arg.
• Full suite 99/99 green, tsc --noEmit clean, tsup build OK.

Notes

• No version bump / publish in this PR — left to the maintainer's release step (the repo bumps versions in dedicated commits).
• Found while dogfooding journey-stack + strata in the conducted-desk shell (the address bar showed no paths as you navigated).

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