Function isPublicTokenFormat

isPublicTokenFormat(token: string): boolean
Validates a Tremendous public token format.

Public tokens are generated by the backend and consist of uppercase letters (A-Z) and digits (0-9). They are case-sensitive and exactly 12 characters long.

This function validates that the token:
- Contains only uppercase letters and digits
- Is exactly 12 characters long
- Matches the backend's token generation format
Parameters
- token: string
  The public token to validate.
Returns boolean
- Returns true if the token is valid, otherwise false.
Example
```
isPublicTokenFormat("ABC123XYZ456"); // true
isPublicTokenFormat("4WBP4HZYLVQM"); // true
isPublicTokenFormat("ABC123"); // false (too short)
isPublicTokenFormat("abc123xyz456"); // false (lowercase)
isPublicTokenFormat("ABC-12345678"); // false (contains hyphen)
isPublicTokenFormat(""); // false (empty)
```
- Defined in utils/publicToken.ts:34