src/Tools/VSCode/extension/media/Preview.svg

explicit preview request/response;
commands, icons, menus like VSCode markdown preview;
clarified Uri information (again);
tuned;

<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 16 16"><style>.st0{fill:#f6f6f6}.st1{fill:none}.st2{fill:#424242}.st3{fill:#f0eff1}</style><path class="st0" d="M11.949 4C11.697 1.756 9.811 0 7.5 0A4.505 4.505 0 0 0 3 4.5c0 .6.12 1.188.35 1.735L0 9.586v.828l2 2 3-2.999V16h11V4h-4.051z" id="outline" style="display: none;"/><g id="icon_x5F_bg"><circle class="st1" cx="7.5" cy="4.5" r="2.5"/><path class="st2" d="M12 10h1v3h-1zM10 11h1v2h-1zM8 12h1v1H8zM8 9h2v1H8z"/><path class="st2" d="M11.949 5a4.431 4.431 0 0 1-.226 1H14v8H7V8.95a4.447 4.447 0 0 1-1-.227V15h9V5h-3.051z"/><path class="st2" d="M10.294 8H12V7h-.762a4.527 4.527 0 0 1-.944 1zM11 4.5a3.5 3.5 0 1 0-7 0c0 .711.215 1.369.579 1.922L1 10l1 1 3.579-3.578A3.485 3.485 0 0 0 7.5 8 3.5 3.5 0 0 0 11 4.5zm-6 0a2.5 2.5 0 1 1 5 0 2.5 2.5 0 0 1-5 0z"/></g><g id="icon_x5F_fg"><path class="st1" d="M10 11h1v2h-1zM8 12h1v1H8zM8 9h2v1H8zM12 10h1v3h-1z"/><path class="st3" d="M11.724 6a4.469 4.469 0 0 1-.485 1H12v1h-1.706c-.771.616-1.733 1-2.794 1-.169 0-.333-.031-.5-.05V14h7V6h-2.276zM8 9h2v1H8V9zm1 4H8v-1h1v1zm2 0h-1v-2h1v2zm2 0h-1v-3h1v3z"/><circle class="st3" cx="7.5" cy="4.5" r="2.5"/></g></svg>