Render preview uses the shared camera navigation (#1462)

* Render preview uses the shared camera navigation

The Render workspace's product preview had its own hard-coded camera
controls. Camera input now lives in one component, navigation::handle,
which the modelling viewport and the Render preview both call (NavCaps:
orbit, pick). Render gets the navigation preset, Orbit around, zoom to the
cursor, the middle double-click and the axis view or navigation cube.
Flat pages can call it with orbit off. A test rejects pages that read the
wheel or move the camera themselves.

Fixes #1454

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* Render panel hint says the camera moves as in Design

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

assets/locales/fr.json

@@ -1129,7 +1129,7 @@
   "render.reload_settings": "Recharger les réglages enregistrés",
   "render.unavailable_preview": "Ce préréglage demande un profil d'aperçu indisponible.",
   "render.use_preview": "Utiliser l'aperçu intégré",
-  "render.navigation_help": "Faire glisser pour orbiter ; glisser avec le bouton du milieu pour un panoramique ; molette pour zoomer. Enregistrer le préréglage mémorise la caméra actuelle.",
+  "render.navigation_help": "La caméra se déplace comme dans Conception (Préférences › Navigation). Enregistrer le préréglage mémorise la caméra actuelle.",
   "render.return_design": "Revenir à la conception",
   "render.image_title": "Image de rendu",
   "render.image_help": "Image d'aperçu CPU · PNG · transparence approximative",