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>

README.md

@@ -83,6 +83,7 @@ Undoing back to the depth of the last save clears the dirty tint rather than lea
 | `Ctrl`/`Cmd` + `Y` or `Ctrl`/`Cmd` + `Shift` + `Z` | Redo |
 | `Del` / `Backspace` | Delete selected component |
 | `Ctrl`/`Cmd` + `B` | Show or hide the tree/palette column |
+| `Ctrl`/`Cmd` + `W` | Tidy Layout: re-flow the open sheet |
 | `Alt` + `Left` / `Alt` + `Right` | Back and forward through the sheets opened this session |
 
 Both `Command-` and `Control-` are bound for each, so the same build works on macOS and