Keep Authoring within its stack and theme, and cover its wiring

- Keep the documented 72px / flex-grow 1 action sizing and the 360px
  panel width; the larger type applies to the Authoring panel only, so
  CCTV and Street Level buttons are unchanged.
- Scope the primary and file-row styles to the panel so Cyber's shared
  button surface no longer overrides them.
- Shorten the scene PLAY in Spanish and Russian so it does not break
  mid-word, and fix two translation inconsistencies.
- Map the spoken name "authoring" to the panel.
- Clear the has-shots marker when the controls are destroyed.
- Test the idle button states through published changes, the PLAY
  translation context, and where the sharing row is placed.

src/i18n/locales/ru.json

@@ -3081,7 +3081,7 @@
   "Add the current view, style and layers as the next shot": "Добавить текущий вид, стиль и слои следующим кадром",
   "Replace the selected shot with the current view": "Заменить выбранный кадр текущим видом",
   "Click a shot to select it, double-click to rename.": "Щёлкните кадр, чтобы выбрать его, дважды — чтобы переименовать.",
-  "scene|PLAY": "ВОСПРОИЗВЕСТИ",
+  "scene|PLAY": "ПУСК",
   "Play the whole scene from its first shot": "Воспроизвести всю сцену с первого кадра",
   "Stop playback (Esc)": "Остановить воспроизведение (Esc)",
   "Play only the shot after the selected one": "Воспроизвести только кадр после выбранного",