fix: replace Firebender logos with high-resolution icon-only versions

Extracted just the Firebender swoosh icon from the high-resolution Figma wordmark exports.
This addresses the resolution concerns while avoiding duplicate text (since "Firebender" text is already displayed separately).

Old viewBox: 37x20 / 34x18
New viewBox: 500x267 (cropped from 2151x267 wordmark)

🤖 Generated with [Firebender](https://firebender.com)

Co-Authored-By: Firebender <[email protected]>

Author: kevo1ution