fix: update OpenAI symbol and wordmark assets - #1039

What changed

Replace the four OpenAI library SVGs with the supplied brand artwork:

• Update the black and white Blossom symbols.
• Replace the combined symbol-and-wordmark lockups with the standalone OpenAI wordmark in black and white.
• Preserve the supplied geometry, colors, viewBoxes, and canvas padding.
• Keep the existing filenames and light/dark asset routes.

Before and after

Asset	Before	After
Blossom
Wordmark

The supplied SVGs include canvas padding, so the artwork appears smaller at the same rendered canvas size.

Validation

• All four files parse as SVG XML and retain their viewBoxes.
• Each file is under 2.5 KB, below the 20 KB checklist limit.
• Rendered and visually reviewed both black and white variants.
• git diff --check passes.
• Supplied SVGs are preserved verbatim; no geometry optimization was applied.