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>

app/(dashboard)/import/page.tsx

@@ -2272,7 +2272,7 @@ export default function ImportPage() {
                         <LogoChip src="/logos/bokio.png" name="Bokio" />
                         <LogoChip src="/logos/bjornlunden.png" name="Björn Lundén" />
                         <LogoChip src="/logos/Briox_logo.png" name="Briox" />
-                        <LogoChip src="/logos/wint.svg" name="WINT" />
+                        <LogoChip src="/logos/wint.png" name="WINT" />
                       </>
                     }
                     disabled={isSandbox}