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/zh-Hant.json

@@ -2862,7 +2862,7 @@
   "routing busy — too many routes at once": "路線服務繁忙：同時請求的路線過多",
   "route proxy error": "路線代理出錯",
   "AUTHORING": "創作",
-  "Create and edit scenes": "建立和編輯場景",
+  "Create and edit scenes": "創建和編輯場景",
   "SCENE": "場景",
   "Scene": "場景",
   "NEW SCENE": "新建場景",