Dark theme (default): Fusion-like blue-grey viewport #2e3440, darker chrome, subtle grid, light text, blue accent; light theme kept as a second Tokens set; toggle on the application bar (sun/moon), ui.set {dark}, kept between runs (eframe storage; browser local storage on the web); viewport, sketch, glyph, view cube, timeline and overlay colours all come from the theme; preview spinner and state in ui.inspect

Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01AS5Tn3xieewUSg3uxrMVdL

apps/solvecraft/src/main.rs

@@ -32,8 +32,14 @@ impl eframe::App for App {
     fn ui(&mut self, ui: &mut egui::Ui, _frame: &mut eframe::Frame) {
         self.0.ui(ui);
     }
+    fn save(&mut self, storage: &mut dyn eframe::Storage) {
+        storage.set_string(PREFS_KEY, self.0.prefs());
+    }
 }
 
+/// Where the preferences (theme) are kept in eframe's storage.
+const PREFS_KEY: &str = "solvecraft.prefs";
+
 fn services() -> Services {
     Services {
         pick_open: Some(Box::new(|| {
@@ -91,6 +97,9 @@ fn main() -> eframe::Result {
         options,
         Box::new(move |cc| {
             let mut app = SolveApp::new(Session::default(), services());
+            if let Some(p) = cc.storage.and_then(|s| s.get_string(PREFS_KEY)) {
+                app.load_prefs(&p);
+            }
             if let Some(rs) = &cc.wgpu_render_state {
                 app.set_wgpu(rs, DEPTH_BITS, u32::from(MSAA));
             }