Use native window controls

src/styles.css

@@ -155,6 +155,7 @@ textarea:focus {
   display: flex;
   justify-content: space-between;
   overflow: hidden;
+  padding-right: 138px;
 }
 
 .titlebarBrand {
@@ -180,33 +181,6 @@ textarea:focus {
   width: 24px;
 }
 
-.windowControls {
-  -webkit-app-region: no-drag;
-  align-items: stretch;
-  display: flex;
-  height: 100%;
-}
-
-.windowControls button {
-  background: transparent;
-  border-radius: 0;
-  color: var(--muted);
-  min-height: 0;
-  min-width: 44px;
-  padding: 0;
-}
-
-.windowControls button:hover {
-  background: var(--surface-subtle);
-  color: var(--text);
-  transform: none;
-}
-
-.windowControls .closeButton:hover {
-  background: #c93d32;
-  color: #fff;
-}
-
 .toolbar {
   align-items: center;
   background: var(--surface);