R5.5: ElyTable right-click menus, Excel-style; three rounds used, last fixes tested

Grid and header menus share ely_office::menu with ElyDoc. Each item's
availability is the kernel's state for the exact command it runs
(patch 0045). Patch 0046 lets a header select its row or column while
a shape is selected or its text is edited: the view shell ends the
drawing edit, keeps the typed text, leaves drawing mode, then marks.
Ely no longer sends Esc first.

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

apps/ely-table/src/cells.rs

@@ -144,7 +144,7 @@ impl Book {
         self.run_in(Some(tab), id, &[&size.to_string()], cx);
     }
 
-    fn ask_size(&mut self, column: bool, window: &mut Window, cx: &mut Context<Self>) {
+    pub(crate) fn ask_size(&mut self, column: bool, window: &mut Window, cx: &mut Context<Self>) {
         let Some(tab) = self.core.active else {
             let text = Book::text(cx, "command.blocked.no_document", &[]);
             return self.toast(text, ely_gpui_component::primitives::Severity::Warning, cx);