This fork's favicon.ico had drifted from upstream's: same Stalwart logo
and color (#DB2D54) in both, but the fork's version had visible padding
around the logo (trimmed bounding box 120x104 within the 128x128 icon)
while upstream's fills the full canvas edge-to-edge. Also encoded at a
lower bit depth (8-bit indexed vs upstream's 32-bit true color).
Replaced with the exact file from stalwartlabs/webui (md5 e9f5eaa1...,
matches byte-for-byte) rather than re-exporting, so it can't drift
again the same way.