Fry3DX 0.4: an easy 3D modeller

Shapes with live settings, shape editing, knife and hole tools, drawing
shapes onto other objects, combining objects (add / subtract / overlap),
copies, thickness, painting with stickers and layers, a Layout tab, a
Print tab with checks, packed .fry files with autosave, export to GLB,
glTF, FBX, OBJ, 3MF, STL and PLY, folders in Layers, its own crash
screen, and a website for GitHub Pages in docs/.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01NMSrd5oe1GpUD7E6d825KP

engine/ui/ui.h

@@ -0,0 +1,38 @@
+#pragma once
+// Game UI look: fonts from the game folder and a Source-like theme (dark
+// translucent panels, flat buttons, light text, red highlights) on top of Dear ImGui.
+#include <cstdint>
+#include <functional>
+#include <string>
+#include <vector>
+
+struct ImFont;
+
+namespace keel::ui {
+
+enum class Font { Regular, Bold, Title };
+
+// After the renderer (ImGui context) and the VFS are up.
+void init();
+ImFont* font(Font f);
+// Sizes in pixels; scaled with the window height so 1080p looks like Source at 1080p.
+float scale();
+void beginFrame(float windowHeight);
+
+// The highlight colour: highlights, the logo.
+inline constexpr uint8_t kAccent[3] = {227, 34, 45};
+uint32_t accent(float alpha = 1.0f, float brightness = 1.0f); // ImU32
+
+// ── Popups: modal messages over everything (disconnects, errors, questions) ──
+struct PopupButton {
+    std::string label;
+    std::function<void()> action; // may be empty: just closes
+};
+// Queued; shown one at a time. No buttons = a single "OK".
+void popup(std::string title, std::string message, std::vector<PopupButton> buttons = {});
+bool popupOpen();
+void closePopup(); // Escape: like pressing the last button
+// The engine calls this each frame after the game's UI.
+void drawPopups();
+
+} // namespace keel::ui