fix(psalm): resolve FastForex Psalm errors after the historical-rates refactor - #179
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… refactor - Use the Exchanger\Contract\CurrencyPair interface in processResponse() so the parent-type returned by ExchangeRateQuery::getCurrencyPair() is accepted (ArgumentTypeCoercion). - Guard the mixed values returned by StringUtil::jsonToArray() with is_string() before passing them to Exception::__construct() and DateTime::__construct() (MixedArgument). - Drop the unused Exchanger\CurrencyPair and Exchanger\Exception\UnsupportedCurrencyPairException imports (no longer referenced after the refactor). - Refresh psalm-baseline.xml: replace the stale MissingOverrideAttribute entry for the removed getExchangeRate() method with entries for getLatestExchangeRate / getHistoricalExchangeRate, and drop the now-unused MixedArgument and ParamNameMismatch baselines.
… baselines - Replace the chained ?? assignment (which still produced a mixed type) with an explicit isset+is_string ladder so Psalm can narrow each branch before passing the value to DateTime::__construct. - Drop the two MixedArgument baseline entries for $this->options[self::API_KEY_OPTION]: those call sites no longer trigger MixedArgument, and keeping the entries was producing UnusedBaselineEntry failures.
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