FX.103 SuperCad: an app's Open a folder / Documents buttons were tiny and unframed when docked, and tall frames in a view

The layout engine resets every button in its palettes to plain text (transparent border, 3px padding) and SuperCad's .sc button reset hit the app's panel once it was moved into the Properties panel, while the site's touch-size .btn-line (3 rem minimum, 17px bold) made frames in a view much taller than their label. Real buttons (btn-line, btn-plot) now keep a frame sized to the label in the layout's own text size, in both places (app-workspace.css, supercadcraft.css). Test tools/super-test/mount-ui.mjs.