Use native window controls

src/App.tsx

@@ -4,8 +4,6 @@ import {
   FileDown,
   FileInput,
   Languages,
-  Maximize2,
-  Minus,
   Plus,
   RefreshCcw,
   Settings,
@@ -335,17 +333,6 @@ export default function App() {
           <div className="titlebarMark">EH</div>
           <span>EnvHelper</span>
         </div>
-        <div className="windowControls">
-          <button onClick={() => window.envHelper?.minimizeWindow()} title="Minimize" type="button">
-            <Minus size={15} />
-          </button>
-          <button onClick={() => window.envHelper?.toggleMaximizeWindow()} title="Maximize" type="button">
-            <Maximize2 size={14} />
-          </button>
-          <button className="closeButton" onClick={() => window.envHelper?.closeWindow()} title="Close" type="button">
-            <X size={15} />
-          </button>
-        </div>
       </section>
 
       <header className="toolbar">