v0.1.1: Adopt W2A ribbon wordmark as master logo (white rounded tile)

Replace the dark container-and-arrow icon with the W2A connected-ribbon wordmark: black W/A glyphs with cyan-green gradient 2 on a white Win11 rounded tile. Reprocess from chosen source: strip AI watermark, keep centered composition, transparent rounded corners. Update icon assets (logo.png / logo_256.png / w2a.ico multi-size), README icon description, and dist master (749KB).