feat: add warm sand theme colors and light / dark mode toggle

js/desktop/src/components/window-controls.tsx

@@ -21,7 +21,7 @@ export function WindowControls() {
       size="icon-sm"
       onClick={() => platform.window.minimize()}
       aria-label="Minimize"
-      className="dark:hover:bg-white/10 rounded text-white/50"
+      className="text-muted-foreground rounded"
     >
       <Minus />
     </Button>
@@ -34,7 +34,7 @@ export function WindowControls() {
       size="icon-sm"
       onClick={() => platform.window.maximize()}
       aria-label={isMaximized ? 'Restore' : 'Maximize'}
-      className="dark:hover:bg-white/10 rounded text-white/50"
+      className="text-muted-foreground rounded"
     >
       {isMaximized ? <Copy /> : <Square />}
     </Button>
@@ -47,7 +47,7 @@ export function WindowControls() {
       size="icon-sm"
       onClick={() => platform.window.close()}
       aria-label="Close"
-      className="hover:text-destructive dark:hover:bg-white/10 rounded text-white/50"
+      className="hover:text-destructive text-muted-foreground rounded"
     >
       <X />
     </Button>