The 16x16 favicon frame and favicon-16.png were saved as 8bpp indexed
images with binary alpha. Antialiased edges of the orange logo got
quantized to opaque palette entries, baking in a dark halo that browser
tab strips revealed as an ugly outline around the glyph.
Re-render from public/logo.svg, preserving its native 720:880 aspect on
a transparent square canvas (the previous fix squished the logo into a
square), downsampling with Lanczos to each target size, forcing PNG
color-type 6 (RGBA) and a multi-frame ICO where every size is 32bpp.
Add scripts/generate-favicons.sh so the next logo change can't silently
reintroduce palette quantization or aspect-ratio stretching.
Alex Gleason
aee220e6b8