R6.12, R6.13: the LOK worker has no Dock icon; Show turns slides

R6.12: on macOS the worker sets LibreOffice's own NSApplication to the
accessory policy before the kit starts, so it never shows in the Dock.

R6.13: when the whole slide fits, the wheel and Up/Down (nothing
selected, no text editing) turn slides in the ElyShow editor.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

crates/ely-lok/src/lib.rs

@@ -20,7 +20,7 @@ pub use client::{
 };
 #[cfg(feature = "view")]
 pub use view::{
-    CONTEXT, Copy, Cut, Geom, Layout, LokError, LokView, Paste, Reported, ZOOM_STEPS,
+    CONTEXT, Copy, Cut, Geom, Layout, LokError, LokView, Paste, Reported, Turn, ZOOM_STEPS,
     Zoomed, init, layout, paper, read_off, scheme,
 };
 #[cfg(feature = "view")]