tauri-build's Windows path unconditionally looks up icons/icon.ico to
embed as the PE file resource (taskbar/Explorer icon). We only had
icon.png (32x32 placeholder) which is fine on macOS/Linux but blocks
the Windows cross-compile with "icons/icon.ico not found; required for
generating a Windows Resource file during tauri-build".
Generated a multi-size ICO (16/24/32/48/64/128/256) from the existing
placeholder icon.png via Pillow. It's ugly at 256 due to upscaling from
32x32 with LANCZOS, but unblocks the build. Real branded icons can
replace it later without any build-system changes.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>