Brand identity per the plan (dark theme + eagle). Ported faithfully from the
current ostp-gui:
- assets/logo.svg + logo.png (the eagle vector/raster).
- .watermark layer: centered, 80%/max-600px, opacity 0.05, behind the
screens (z-index 0, pointer-events none), with a light-theme invert.
- Watermark div added after the ambient blobs in index.html.
Dark theme already existed in styles.css; this adds the eagle the plan calls
for. Backend-independent (pure HTML/CSS/asset).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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