Add an internal session token signal hook

[jacekradko]

Summary

• Add an instance-owned session token signal on Clerk state and wire it from active-session token updates
• Expose __internal_useToken() through @clerk/react/internal via useSyncExternalStore without fetching token on mount
• Add coverage for unloaded, signed-out, signed-in, rerender, and token update paths, plus an empty changeset

Testing

• pnpm --filter @clerk/clerk-js test src/core/__tests__/state.test.ts src/core/resources/__tests__/Session.test.ts src/core/__tests__/clerk.test.ts
• pnpm --filter @clerk/react test src/hooks/__tests__/useToken.test.tsx
• pnpm --filter @clerk/clerk-js build:declarations
• pnpm --filter @clerk/react build:declarations
• Prettier and targeted ESLint checks passed on touched files

[vercel]

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Project	Deployment	Actions	Updated (UTC)
clerk-js-sandbox	Ready	Preview, Comment	May 5, 2026 3:11am

[changeset-bot]

🦋 Changeset detected

Latest commit: 07aa19f

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

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