docs(use-search-params): add warning about optional default values for schema …

[kyrregjerstad]

Summary

Adds documentation warning that schema fields using .optional() without explicit defaults will be silently ignored and cannot update the URL.

Why

useSearchParams extracts field information by validating an empty object against the schema. Fields without defaults won't appear in the validation result, so the hook doesn't recognize them as valid parameters for URL updates.

This caused me some headache when params.fieldName = value silently failed to update the URL.

[changeset-bot]

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Latest commit: 2ccf8c5

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[github-actions]

Hi @kyrregjerstad, thanks for the PR!

This PR was opened from the main branch of your fork. That prevents maintainers from safely pushing edits.

Please create a new branch in your fork (e.g. feat/my-change) and open a new PR.

Closing this PR to keep things tidy.