Add a selector for .cm-content to caret-hiding style

FIX: Work around an issue on Safari on macOS Sonoma that made the native
cursor visible even when `drawSelection` is enabled.

Closes #59

src/draw-selection.ts

@@ -114,5 +114,5 @@ const themeSpec = {
     "&::selection": {backgroundColor: "transparent !important"}
   }
 }
-if (CanHidePrimary) (themeSpec as any)[".cm-line"].caretColor = "transparent !important"
+if (CanHidePrimary) (themeSpec as any)[".cm-content, .cm-line"].caretColor = "transparent !important"
 const hideNativeSelection = Prec.highest(EditorView.theme(themeSpec))