Function longestWordLength

longestWordLength(str: string): number
Finds the length of the longest word in a string.
Parameters
- str: string
  The input string.
Returns number
Length of the longest word.
Remarks
- Words are split by whitespace (/\s+/).
- Symbols (punctuation, special chars) are removed using stripSymbols.
- Returns 0 if the string is empty or contains no words.
Example
```
longestWordLength("js utils kit");              // 5
longestWordLength("short   longerword   mid"); // 10
longestWordLength("hello");                    // 5
longestWordLength("");                         // 0
```
- Defined in src/string/fn.ts:202