fix: prevent locked scroll re-entry

[huytdps13400]

Motivation

Fixes #2737.

On iOS Fabric, scrollTo may synchronously emit another scroll or momentum-end event. While the scrollable remains LOCKED, the default handlers call scrollTo again on that same native stack until it overflows.

This change adds one shared-value re-entrancy guard around the three locked-state scrollTo call sites. The outer command and existing offset updates are preserved; only nested commands are skipped. The guard is released in finally so an error cannot leave the scrollable permanently locked.

Verification

• yarn test — 2/2 regression tests pass (re-entry is bounded; lock is released after errors)
• yarn typescript — pass
• yarn biome check --error-on-warnings package.json src/hooks/executeWithLock.ts src/hooks/useScrollEventsHandlersDefault.ts tests/executeWithLock.test.cjs — pass
• yarn build — pass for CommonJS, module, and TypeScript targets

Full yarn lint still reports the existing useOptionalChain warning in src/hooks/useBoundingClientRect.ts:54; that file is unchanged from master.