fix: initials function causing crash 🐞

[luke-mcfarlane-rocketlab]

JIRA Ticket

BSS-794

Description

Resolving the issue where having extra spacing in name would cause the app to crash.

Proposed Changes

• updated initials function to index the substrings using slice to avoid crashing on empty strings

How to Test

1. Create a new account with extra spacing in the name e.g " Luke Test "
2. Log in to new conductor using that account
3. Verify the app loads normally and your profile initials are displaying correctly in the bottom left of the screen

Additional Information

Checklist

• I have confirmed all commits have been signed.
• I have added JSDoc style comments to any new functions or classes.
• Relevant documentation such as READMEs, guides, and class comments are updated.