feat: add multi-language (i18n) support with Japanese UI

apps/solvecraft/src/main.rs

@@ -169,6 +169,7 @@ fn main() -> eframe::Result {
         "SolveCraft",
         options,
         Box::new(move |cc| {
+            solvecraft_ui_egui::fonts::setup_fonts(&cc.egui_ctx);
             let mut app = SolveApp::new(Session::default(), services());
             app.custom_titlebar = CUSTOM_TITLEBAR;
             app.integrated_titlebar = cfg!(target_os = "macos");