test(avatar): cover explicit initials prop override

[TruptiAgrawal]

Description

Added a test to verify that the explicit initials prop takes precedence when provided to the Avatar component.

The test ensures that the Avatar renders the explicitly provided initials correctly.

Scope

Patch: Bug Fix

[CLAassistant]

All committers have signed the CLA.

[dyesin]

Thanks for the PR. Before we review it, please note that "check this" isn't a submission we can accept. It hands the verification work to maintainers, and our review time is limited.

We welcome AI-assisted contributions, but you are the author and must stand behind every line. Before requesting review, please:

Run it. Set up the dev environment, run the full test suite, and confirm the change works as intended.
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Justify it. Describe the actual problem this solves and how you confirmed it's fixed. For performance changes, include evidence.
Test it. Add or update tests following the patterns already used in the repo.
Keep it focused. One concern per PR, with no unrelated edits.

Once you can confirm all of the above in the PR description, we're happy to take a look. Until then, we'll mark this as a draft.