Tidy Layout on Ctrl/Cmd+W

Joins the Command/Control shortcut pairs, so the chord works the same on
either platform, and the View menu entry now shows it.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

main.py

@@ -1174,6 +1174,7 @@ SHORTCUTS = [
     ("z", do_undo),
     ("y", do_redo),
     ("b", toggle_left_column),
+    ("w", do_tidy_layout),
 ]
 for key, handler in SHORTCUTS:
     window.bind_all(f"<Command-{key}>", handler)
@@ -1229,7 +1230,9 @@ menu_view.add_command(
     label=MENU_FORWARD_LABEL, command=go_forward, accelerator="Alt+Right", state="disabled"
 )
 menu_view.add_separator()
-menu_view.add_command(label="Tidy Layout", command=do_tidy_layout)
+menu_view.add_command(
+    label="Tidy Layout", command=do_tidy_layout, accelerator=f"{accel_mod}+W"
+)
 menu_bar.add_cascade(label="View", menu=menu_view)
 
 menu_kits = tk.Menu(menu_bar, tearoff=0)