- Remove unused BevyScene and related dependencies.

- Refactor `InstallButton` and relocate it to `install/`.
- Update `Toolbar` imports to reflect the new `InstallButton` structure.
- Introduce `handleInstall` functionality for PWA installation prompt handling.

packages/client/src/components/install/Install.tsx

@@ -0,0 +1,7 @@
+import React, { useEffect, useState } from 'react';
+
+function InstallButton() {
+  return <button onClick={handleInstall}>Install App</button>;
+}
+
+export default InstallButton;