Function formatCzechCurrency

formatCzechCurrency(amount: string | number): string
Formats a number as Czech currency with proper thousands separators and CZK suffix.
Parameters
- amount: string | number
  The numeric amount to format
Returns string
Formatted string in Czech currency format (e.g., "35 820 CZK")
Example
```
formatCzechCurrency(35820);    // Returns: "35 820 CZK"
formatCzechCurrency(1500.50);  // Returns: "1 501 CZK" (rounded to nearest whole number)
formatCzechCurrency(0);        // Returns: "0 CZK"
```
- Defined in src/utils/currency.ts:14