Address review: playable PLAY/NEXT, visible rename editor, accurate copy

- PLAY and NEXT continue into the following scenes, so they stay
  enabled while any scene in the project has a shot, not only the
  selected one.
- Renaming a shot drops the number and ellipsis so the editor is no
  longer hidden; qa-scene-controls checks a long rename stays visible.
- PLAY, NEXT, EDIT DETAILS and SHARE SCENE tooltips describe what the
  buttons do, translated in every shipped language.
- The primary actions and the file row keep a hover state.
- Docs: the EXPORT rename in DIRECTOR-SHARING and the playback button
  states in CURRENT-STATE are accurate.
- Test the voice "authoring" alias through set_panel_open.

docs/DIRECTOR-SHARING.md

@@ -42,7 +42,7 @@ field definitions. This is a basic draft editor, not a node graph or path editor
 SHARE SCENE exports only the selected scene. Download scene JSON preserves its
 camera, timing, layers, anchors, manifests, interactions and attribution, but
 contains no asset bytes. The recipient needs the referenced source registrations
-and files. Existing EXPORT PRESETS continues to export the entire project.
+and files. EXPORT (formerly EXPORT PRESETS) continues to export the entire project.
 
 For a bundle, select the declared pack files or a folder, then Download asset
 bundle. Folder paths match a manifest path either directly or after removing the