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.

docs/CURRENT-STATE.md

@@ -1176,7 +1176,8 @@ The panel is titled Authoring and is laid out in four labelled steps: SCENE
 (picker on its own row, NEW SCENE, DELETE), SHOTS (+ CAPTURE SHOT, UPDATE SHOT,
 the numbered shot list and a select/rename hint), PREVIEW (PLAY, STOP, NEXT) and
 SAVE & SHARE (EXPORT, IMPORT, RUN LOG, then the EDIT DETAILS / SHARE SCENE row).
-Every action has a tooltip, and the status line is a polite live region. Outside
+Every button in the panel's step rows has a tooltip, and the status line is a
+polite live region. Outside
 playback a button that would do nothing is disabled: DELETE and CAPTURE SHOT
 without a scene, UPDATE SHOT without a selected shot, PLAY and NEXT on a scene
 with no shots. During playback everything but STOP stays disabled as before.