Google launched Gemini for Mac with a system-wide Option+Space shortcut, Chrome turned prompts into reusable one-click Skills, and Microsoft gave Copilot the track-changes audit trail that lawyers demand. Three platform moves in 24 hours that share a thesis: the AI relationship will be won by whoever owns the surface area you already work on — the OS shortcut, the browser tab, the document. Standalone AI apps should be paying attention.