layerling 1.76.0

• The edge under the pointer is easy to see in the edge tools: In Fillet and Chamfer the light blue line of the hovered edge had almost no contrast where it ran in front of the pale floor, so the near bottom edges were hard to pick, and worse when the shape was lifted off the plane. The hovered edge now has a dark outline around it and reads clearly on light and dark ground. Reported by @rondlh (#376).
• A run of arrow presses is one step in the history: Every press of an arrow key moving the selection (also Ctrl with Up and Down, and in the sketch) was a step of its own, so holding a key or tapping it a few times filled the history with tiny steps. Now a press that follows the last one within a second and a half, on the same selection and with nothing else done in between, replaces that step instead of adding one, so Undo takes back the whole run. A run that ends where it started leaves no step. (#370)
• Czech: The whole interface, the 16 chapters of the guide, the release notes and the guide's own pages are in Czech, with the language list and the guide's language switch. It is picked automatically for a browser set to Czech. The PDF of a drawing writes the base letter where its standard typeface lacks a Czech or Polish accent (the SVG keeps the original). Made by @mispacek with an AI assistant (pull request #379); a second Czech reader is still welcome, wrong words are fixed with a small pull request.
• Slovenian: The whole interface, the 16 chapters of the guide and the guide's own pages are in Slovenian, with the language list and the guide's language switch. It is picked automatically for a browser set to Slovenian. Made by @andrej-cds with an AI assistant (discussion #170); a second Slovenian reader is welcome, wrong words are fixed with a small pull request.
• A custom snap grid used whole carries its name alone: In the snap menu a custom grid you named "10 mm" read "1 × 10 mm". Used whole it now reads "10 mm"; the halves and quarters still read "½ × 10 mm" and "¼ × 10 mm". Reported by @rondlh (#329).
• Measuring a circle in the section view: The cut through a round part, a cylinder or a hole, is a polygon, so a click could only land on one of its corners and a distance across it was never quite the diameter. Round outlines are now recognised: a small cross marks the centre, the centre snaps, a first point on the circle makes the second one land exactly across the centre, and the number then reads Ø (the diameter); from the centre to the circle it reads R (the radius). Ellipses from slanted cuts are not recognised. The MCP action layerling_measure_section snaps the same way and returns circle ("diameter", "radius" or null). (#375)
• A preview of the intersection, and shapes that share nothing stay: A new button beside Boolean Intersection, "Show common part", turns the selected shapes see-through and draws what they share in green. Select and move each shape on its own and the green part follows (it is calculated again a moment after every change; above 40,000 triangles the preview says it is too big). Boolean Intersection applies it, Esc closes the preview. And when the selected shapes share nothing, Intersection no longer removes them all: they stay and a message says so. Asked for by @prmod3d (#372).