feat(scene): video map editor parity and help updates

Enable scene editor, overlays, effects, and darkness on video scenes; brighten GM trap markers; document snap, NPC types, materials, and control controls in RU/EN help.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/renderer/editor/EditorApp.tsx

@@ -2755,6 +2755,10 @@ function SceneInspector({
           >
             {t('scene.rotate')}
           </Button>
+        </>
+      ) : null}
+      {previewAssetId && (previewAssetType === 'image' || previewAssetType === 'video') ? (
+        <>
           <div className={styles.spacer6} />
           <label className={styles.checkboxLabel}>
             <input