Add complete Government Travel Cost Estimator web application

Co-authored-by: mblanke <9078342+mblanke@users.noreply.github.com>

currencyConverter.js

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+// Currency Converter Module
+// Supports EUR, AUD, CAD, USD with auto-conversion
+
+// Exchange rates (as of January 2026)
+// In production, these should be fetched from a real-time API
+const EXCHANGE_RATES = {
+    CAD: {
+        CAD: 1.0,
+        USD: 0.72,
+        EUR: 0.66,
+        AUD: 1.12
+    },
+    USD: {
+        CAD: 1.39,
+        USD: 1.0,
+        EUR: 0.92,
+        AUD: 1.56
+    },
+    EUR: {
+        CAD: 1.52,
+        USD: 1.09,
+        EUR: 1.0,
+        AUD: 1.69
+    },
+    AUD: {
+        CAD: 0.89,
+        USD: 0.64,
+        EUR: 0.59,
+        AUD: 1.0
+    }
+};
+
+// Currency symbols
+const CURRENCY_SYMBOLS = {
+    CAD: 'C$',
+    USD: 'US$',
+    EUR: '€',
+    AUD: 'A$'
+};
+
+// Convert amount from one currency to another
+function convertCurrency(amount, fromCurrency, toCurrency) {
+    if (!amount || amount < 0) return 0;
+    if (fromCurrency === toCurrency) return amount;
+    
+    if (!EXCHANGE_RATES[fromCurrency] || !EXCHANGE_RATES[fromCurrency][toCurrency]) {
+        console.error(`Conversion rate not available for ${fromCurrency} to ${toCurrency}`);
+        return amount;
+    }
+    
+    const rate = EXCHANGE_RATES[fromCurrency][toCurrency];
+    return amount * rate;
+}
+
+// Format currency amount with symbol
+function formatCurrency(amount, currency) {
+    const symbol = CURRENCY_SYMBOLS[currency] || currency;
+    return `${symbol}${amount.toFixed(2)}`;
+}
+
+// Get exchange rate
+function getExchangeRate(fromCurrency, toCurrency) {
+    if (fromCurrency === toCurrency) return 1.0;
+    
+    if (!EXCHANGE_RATES[fromCurrency] || !EXCHANGE_RATES[fromCurrency][toCurrency]) {
+        return null;
+    }
+    
+    return EXCHANGE_RATES[fromCurrency][toCurrency];
+}
+
+// Calculate and format conversion details
+function getConversionDetails(amount, fromCurrency, toCurrency) {
+    const rate = getExchangeRate(fromCurrency, toCurrency);
+    const convertedAmount = convertCurrency(amount, fromCurrency, toCurrency);
+    
+    return {
+        originalAmount: amount,
+        originalCurrency: fromCurrency,
+        targetCurrency: toCurrency,
+        exchangeRate: rate,
+        convertedAmount: convertedAmount,
+        formatted: {
+            original: formatCurrency(amount, fromCurrency),
+            converted: formatCurrency(convertedAmount, toCurrency),
+            rate: `1 ${fromCurrency} = ${rate} ${toCurrency}`
+        }
+    };
+}
+
+// Get all supported currencies
+function getSupportedCurrencies() {
+    return Object.keys(EXCHANGE_RATES);
+}
+
+// Validate currency code
+function isValidCurrency(currencyCode) {
+    return EXCHANGE_RATES.hasOwnProperty(currencyCode);
+}
+
+// Export for use in other modules
+if (typeof module !== 'undefined' && module.exports) {
+    module.exports = {
+        EXCHANGE_RATES,
+        CURRENCY_SYMBOLS,
+        convertCurrency,
+        formatCurrency,
+        getExchangeRate,
+        getConversionDetails,
+        getSupportedCurrencies,
+        isValidCurrency
+    };
+}