docs(readme): show a dark showcase image on dark themes (#6915)

The showcase illustration was a single light PNG, so it stayed a white
slab on GitHub's dark themes. Redraw it as a light and a dark SVG, and
swap the linked image in README.md and all 21 translations for a
<picture> with a prefers-color-scheme: dark source. Alt text and link
targets are unchanged. The PNG is deleted because nothing else uses it.
website/figures.md notes the pair.

🤖 Generated with Claude Code (Sonnet 5.5) 🦊

Co-authored-by: Claude Sonnet 5.5 <noreply@anthropic.com>
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Cassie_FoxandClaude Sonnet 5.5 authored and GitHub committed 2026-10-24 05:51:22 +08:00
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@@ -195,7 +195,12 @@ Obsługiwane formaty natywne i platformy zależą od dostawcy analizy. Zobacz [k
## Przykłady zastosowań
[![Ilustracje studiów przypadku panoramowania dźwięku w DX-Ball, mostka schowka w Notion i pierścienia pocisków w TH04](../assets/rea-showcases.png)](https://rea.tools/pl/showcase/)
<a href="https://rea.tools/pl/showcase/">
<picture>
<source media="(prefers-color-scheme: dark)" srcset="../assets/rea-showcases-dark.svg" />
<img alt="Ilustracje studiów przypadku panoramowania dźwięku w DX-Ball, mostka schowka w Notion i pierścienia pocisków w TH04" src="../assets/rea-showcases.svg" />
</picture>
</a>
### DX-Ball: odtworzenie obliczania panoramy dźwięku