Preferences window (File › Preferences): theme, units of new designs, recovery copies every N minutes (to a Recovery folder beside the preferences), mouse presets (Fusion, SolidWorks, Inventor), reverse zoom, orbit around the point under the cursor, grid, perspective, visual style, display precision, anti-aliasing (on restart), sketch and selection options; all kept between runs; ui.prefs control method

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AS5Tn3xieewUSg3uxrMVdL

crates/ui-egui/src/toolbar.rs

@@ -185,7 +185,7 @@ fn file_menu(app: &mut SolveApp, ctx: &egui::Context) {
                 }
                 ui.separator();
                 if item(ui, "Preferences…", "") {
-                    app.dialog = Some(crate::dialogs::Dialog::preferences());
+                    app.prefs_window.open = true;
                     close = true;
                 }
                 if item(ui, "Keyboard Shortcuts…", "") {