Add comprehensive test coverage for hooks that were missing tests:

- useBoundingclientrect: 12 tests covering basic functionality, DOMRect
  properties, mutation tracking, edge cases, cleanup, multiple instances,
  SSR compatibility, performance, and different element types

- useGlobalObjectEventListener: 24 tests covering window/document listeners,
  event handling, cleanup, listener options (capture, once, passive),
  conditional attachment, layout effect option, fresh callbacks, edge cases,
  multiple instances, and real-world scenarios

- useMergeRefs: 25 tests covering mutable refs, callback refs, mixed refs,
  null/undefined handling, memoization, React component integration, edge
  cases, TypeScript type safety, and performance

- useRefElement: 27 tests covering basic functionality, ref callbacks,
  callback stability, React integration, different element types, state
  updates, multiple instances, edge cases, cleanup, and real-world use cases

- useResizeObserverRef: Enhanced from 2 to 27 tests, adding coverage for
  callback execution, fresh callbacks, cleanup, options (box types), ref
  stability, multiple elements, element switching, edge cases, and performance

Total: 115 new tests added (126 passing, 1 skipped)

All tests follow the established patterns in the repository:
- Use @testing-library/react-hooks for hook testing
- Include expect.hasAssertions() at the start of each test
- Test memoization/function reference stability
- Verify cleanup on unmount
- Test SSR compatibility where applicable
- Cover edge cases, error handling, and performance scenarios

Fix TypeScript compilation errors in hook tests:

- useGlobalObjectEventListener.spec.tsx: Add all 6 required parameters
  (globalObject, eventName, callback, listenerOptions, when, isLayoutEffect)
  to all function calls to satisfy the function overload signatures

- useMergeRefs.spec.tsx: Fix callback ref return types - callbacks must
  return void or cleanup function, not numbers. Changed arrow functions
  from implicit return of array.push() to explicit void return

All tests still pass (126 passing, 1 skipped)
Typecheck now passes successfully