Updates all Tauri icon targets: 32x32, 128x128, 128x128@2x, icon.png,
icon.ico (multi-size), icon.icns (16/32/128/256/512), and all Windows
NSIS Square*Logo and StoreLogo sizes. Generated from lotus_chat.png
(1254x1254 source in the cinny repo).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>