feat(providers): use WINT's real logo instead of the placeholder wordmark (#1619)

public/logos/wint.svg was an explicit placeholder ("swap for WINT's official
logo asset before launch"): an Arial "WINT" text node. Replace it with the
official mark, supplied as PNG with transparency.

Downscaled from 1402x1122 / 771 KB to 256x205 / 10 KB (trimmed, 16-colour
palette) so it sits in the same weight class as the other provider logos,
which are 1.6-4 KB and render in the same 40px chip.

Both references updated: the wizard's PROVIDER_LOGOS map and the /import
LogoChip row. No wint.svg references remain.

Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>

components/extensions/general/ArcimMigrationWorkspace.tsx

@@ -393,7 +393,7 @@ const PROVIDER_LOGOS: Record<ArcimProvider, string> = {
   bokio: '/logos/bokio.png',
   bjornlunden: '/logos/bjornlunden.png',
   briox: '/logos/Briox_logo.png',
-  wint: '/logos/wint.svg',
+  wint: '/logos/wint.png',
 }
 
 function ProviderStep({