feat: add transform:scale() UI scaling for 1920x1080 canvas

src/main.ts

@@ -2,6 +2,13 @@ import { createApp } from 'vue'
 import { createPinia } from 'pinia'
 import App from './App.vue'
 
+function applyScale() {
+  const s = Math.min(window.innerWidth / 1920, window.innerHeight / 1080)
+  document.documentElement.style.setProperty('--scale', String(s))
+}
+applyScale()
+window.addEventListener('resize', applyScale)
+
 const app = createApp(App)
 app.use(createPinia())
 app.mount('#app')