The .ico file is a single 32×32 frame with white (255,255,255,255)
pixels filling the rounded-corner regions instead of transparent
ones, so declaring it as an `<link rel="icon">` made Chrome render
the favicon with visible white corners on dark backgrounds. The
svg+xml type fix and apple-touch-icon link remain — those don't
involve the .ico.
Legacy browsers that need the .ico will still find it via the root
`/favicon.ico` auto-probe; regenerating the .ico from favicon.svg
so its content matches the rest is a separate asset change.
