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

This reverts commit 6a6414510e.

src/App.vue

@@ -405,6 +405,10 @@ html, body {
   font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
 }
 
+#app {
+  width: 100%;
+  height: 100%;
+}
 </style>
 
 <style scoped>

src/main.ts

@@ -2,13 +2,6 @@ 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')