fix(clerk-js): Sync BaseRouter state on pushState/replaceState (core 2)

[brkalow]

Summary

Cherry-pick of #7840 into release/core-2.

• Syncs BaseRouter internal state when external code calls history.pushState / history.replaceState
• Uses the Navigation API when available, with a monkey-patching fallback
• Wraps internal navigation with flushSync to prevent stale state during setActive

Original PR: #7840

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Project	Deployment	Actions	Updated (UTC)
clerk-js-sandbox	Ready	Preview, Comment	Feb 17, 2026 7:18pm

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🦋 Changeset detected

Latest commit: 6a85991

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 3 packages

Name	Type
@clerk/clerk-js	Patch
@clerk/chrome-extension	Patch
@clerk/clerk-expo	Patch

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commit: 6a85991