Web app: 3D mouse navigation through the Gamepad API (#1473)

The web app reads a 3D mouse through the Gamepad API and drives the camera through navigation::device, so it follows each page's navigation capabilities (#1336).

Co-authored-by: CamWight <CamWight@users.noreply.github.com>
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

assets/locales/uk.json

@@ -308,7 +308,7 @@
   "sketch.make_selection": "Перетворити виділене на {linetype}",
   "ui.1_degree_of_freedom": "1 ступінь вільності",
   "ui.3d_mouse_speed": "Швидкість 3D-миші",
-  "ui.3d_mouse_windows": "3D-миша (Windows)",
+  "ui.3d_mouse_windows": "3D-миша",
   "ui.3d_sketch": "3D-ескіз",
   "ui.about": "Про програму",
   "ui.activate": "Активувати",