Function NormalizeUUID

NormalizeUUID(uuid: string | null | undefined): string
Normalizes a UUID string for consistent comparison by trimming whitespace and converting to lowercase. Returns an empty string for null/undefined input.
Parameters
- uuid: string | null | undefined
  The UUID string to normalize
Returns string
The normalized (lowercased, trimmed) UUID string, or empty string if input is nullish
Example
```
NormalizeUUID('A1B2C3D4-E5F6-7890-ABCD-EF1234567890')
// Returns: 'a1b2c3d4-e5f6-7890-abcd-ef1234567890'

NormalizeUUID(null) // Returns: ''
NormalizeUUID('  A1B2C3D4  ') // Returns: 'a1b2c3d4'
```
- Defined in util/UUIDUtils.ts:25