FX.124 SuperCad Home: New project is a setup page, not a confirm and prompt; cancelling Open file no longer closes Home

Wrong: New on Home used the browser's confirm and prompt (an alert saying the open project has files), Open file left Home the moment it was clicked so a cancelled pick dropped you into the drawing space, and the 'No projects opened or saved' line was squeezed into one card column. Changed: New opens a New project page on Home (super-newproject.js): name, description, what it is for (design, documentation, estimate, review, study, other), client, team (from the Teams plugin), start and due dates (a due before the start is refused), length unit and keep-earlier-versions, with a notice and Save first when the open project has files. The details are stored in the project (new optional info block in Data/manifest.json; older files open with empty details; cleanInfo validates days and intent). Open any file, open folder and open project file leave Home only after something really opened. The empty-projects line spans the row. Tests: home-actions 19, test-super-core 137, test-super-home 22. Untested: the page on a phone, a real file pick on every browser. Not done: the chosen team is recorded on the project but not given project access (that is still done on the Teams page); the intent and dates are not shown on the Home project card yet; strings English only; the file-format spec page does not list info.