docs(use-search-params): add warning about optional default values for schema #398
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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.