Preferences: one Fusion-style dialog from the gear at the top right and Ctrl+, (Cmd+,)

Pages: General (theme Dark/Light/System, UI scale, units of new designs, autosave, display
precision, the agent cursor), Navigation (Fusion, SolidWorks, Inventor, Alias and Tinkercad
mouse presets, reverse zoom, zoom to the cursor, orbit centre, view-change animation on/off and
speed), Keyboard Shortcuts (the old Shortcuts window as a page: search, rebind, conflicts),
Design (default modelling orientation Y up / Z up for #3, and the offer to stand up a Y-up STEP
or IGES file: a quarter turn about X as one undoable Move), Graphics, Sketch, Selection.
Changes apply at once; Cancel or Esc puts back what was there when the dialog opened, Apply
keeps them, OK closes, Restore Defaults resets the page. The theme, ground shadow and agent
cursor settings are now kept between runs. File and Help › Keyboard Shortcuts open the page;
the unused docked Preferences dialog is gone. Control: ui.prefs {open, button, stand_up, …}.
Scenario s45_preferences; tests for Cancel/Apply/defaults and standing a Y-up file up.

Fixes #36

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RjGw4gA5ZvKrU8MQP6sBgT

crates/ui-egui/src/lib.rs

@@ -54,6 +54,7 @@ pub mod sketch_dims;
 mod sketch_edit_tests;
 pub mod sketch_palette;
 pub mod sketch_tools;
+pub mod stand_up;
 pub mod theme;
 pub mod timeline;
 pub mod titlebar;
@@ -194,6 +195,8 @@ pub struct SolveApp {
     pub autosave: Option<solvecraft_engine::recovery::Autosaver>,
     /// Designs left by crashed apps, offered for recovery.
     pub recoverable: Vec<solvecraft_engine::recovery::Entry>,
+    /// The bodies of a just-opened Y-up file, offered to be stood up (`stand_up`).
+    pub stand_up: Option<Vec<String>>,
     /// The last command was a big operation: autosave after it.
     pub big_operation: bool,
     /// Autosave interval (minutes; 0 = only after big operations). A preference.
@@ -250,6 +253,7 @@ impl SolveApp {
             quit_requested: false,
             autosave: None,
             recoverable: Vec::new(),
+            stand_up: None,
             big_operation: false,
             autosave_minutes: 5.0,
             custom_titlebar: false,
@@ -292,6 +296,8 @@ impl SolveApp {
             "shortcut_box": self.sbox.prefs(),
             "shortcuts": self.keymap.prefs(),
             "autosave_minutes": self.autosave_minutes,
+            "ground_shadow": self.ui.ground_shadow,
+            "agent_cursor": self.ui.agent_cursor,
             "preferences": self.preferences,
         })
         .to_string()
@@ -345,6 +351,16 @@ impl SolveApp {
         if let Some(p) = v.get("preferences").and_then(|p| serde_json::from_value::<prefs::Prefs>(p.clone()).ok()) {
             self.preferences = p;
         }
+        // Saved before the theme was a preference: the Dark/Light flag says which.
+        if v.get("preferences").and_then(|p| p.get("theme")).is_none() {
+            self.preferences.theme = if self.ui.dark { "dark" } else { "light" }.into();
+        }
+        if let Some(g) = flag("ground_shadow") {
+            self.ui.ground_shadow = g;
+        }
+        if let Some(a) = v.get("agent_cursor").and_then(|a| serde_json::from_value(a.clone()).ok()) {
+            self.ui.agent_cursor = a;
+        }
     }
 
     pub fn with_control(mut self, rx: Receiver<ControlRequest>) -> Self {
@@ -564,6 +580,7 @@ impl SolveApp {
         documents::prepare_open(self);
         if self.run("doc.open", json!({ "path": path })).is_ok() {
             self.fit_view();
+            stand_up::offer(self, path, &[]);
         }
     }
 
@@ -571,8 +588,10 @@ impl SolveApp {
     /// current design.
     pub fn insert_path(&mut self, path: &str) {
         let cmd = if solvecraft_engine::io::is_mesh_path(path) { "file.insert_mesh" } else { "file.insert_step" };
+        let before: Vec<String> = self.session.world_state().bodies.iter().map(|b| b.name.clone()).collect();
         if let Ok(r) = self.run(cmd, json!({ "path": path })) {
             self.fit_view();
+            stand_up::offer(self, path, &before);
             if let Some(w) = r["warnings"].as_array().filter(|w| !w.is_empty()) {
                 self.set_status(format!("imported with {} warning(s): {}", w.len(), w.first().and_then(Value::as_str).unwrap_or("")), false);
             }
@@ -623,7 +642,18 @@ impl SolveApp {
         if !to.is_valid() {
             return;
         }
-        self.cam_anim = Some(CameraAnim::new(self.cam, to, self.now));
+        // Preferences › Navigation: animated (at a chosen speed) or immediate.
+        if !self.preferences.look_at_anim {
+            self.cam = to;
+            self.cam_anim = None;
+            return;
+        }
+        let mut anim = CameraAnim::new(self.cam, to, self.now);
+        let speed = f64::from(self.preferences.look_at_speed);
+        if speed.is_finite() && speed > 0.0 {
+            anim.duration /= speed;
+        }
+        self.cam_anim = Some(anim);
     }
 
     /// Animated view changes for the view cube and navigation bar.
@@ -666,6 +696,7 @@ impl SolveApp {
     /// Per-frame logic before layout.
     pub fn logic(&mut self, ctx: &egui::Context) {
         self.esc_handled = false;
+        prefs::apply(self, ctx);
         if !self.styled || theme::is_dark() != self.ui.dark {
             theme::set_dark(self.ui.dark);
             theme::apply(ctx);
@@ -753,13 +784,13 @@ impl SolveApp {
         sketch_palette::show(self, ui.ctx());
         params_dialog::show(self, ui.ctx());
         recovery_ui::show(self, ui.ctx());
+        stand_up::show(self, ui.ctx());
         context_menu::show(self, ui.ctx());
         delete::show(self, ui.ctx());
         if self.custom_titlebar {
             titlebar::resize_zones(ui);
         }
         shortcut_box::show(self, ui.ctx());
-        keymap::show(self, ui.ctx());
         prefs::show(self, ui.ctx());
         agent_cursor::paint(self, ui.ctx());
         self.frame_ms = now_ms() - t0;