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feat: Expose errors via state in `useLocalStorage` (#31)

* feat: Expose errors via state in useLocalStorage

This introduces explicit error reporting for storage operations
in `useLocalStorage`.

Instead of relying on silent `console.error` logging, storage
failures (serialization, deserialization, or storage access)
are now:

*   Wrapped in a custom `LocalStorageError` class.
*   Exposed via the new `error` property returned by the hook.

* fix: Clear error state upon successful read

Ensures that the internal error state is cleared if a successful
value read occurs (e.g., after an external update corrects a
previously corrupt entry).

Includes new tests verifying:
*   Error clearing behavior.
*   Error handling when the `serializer` fails during `setValue`.

* test: Improve error tests for useLocalStorage

Refactors existing error tests and adds coverage for failures
during the initial read phase (deserialization).

This ensures that when a custom serializer fails during
`deserialize`, the `useLocalStorage` hook correctly handles
the error:

*   Sets `result.current.error` to `LocalStorageError`.
*   Includes the underlying serialization error as the `cause`.
*   Keeps `result.current.value` as `undefined`.

* docs: Show error handling in README example

Added a demonstration of how to check for and render potential
`error` states returned by `useLocalStorage` within the Basic Counter
example.

Also reordered sections in the README for better content flow.

* docs: Add link to crypto-js in README

Adds a direct link to the recommended external
library `crypto-js` within the custom serializer
example section of the `README.md`.

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