feat(notes): render macroplan code blocks as a delivery plan grid

Follows the tikz pattern: the fence emits a base64 placeholder, then
the post-render hook lazily imports the parser and grid (separate
chunks) and mounts the grid only when a placeholder exists. Mono font
forced on the block because the flag-stacking math assumes Fira Code.

src/components/StackedPublicNote.vue

@@ -79,7 +79,8 @@ const content = computed(() =>
 
 useMarkdownPostRender(content, () => `.note-${classNameId.value}`, {
   onReady: () => listenToClick(),
-  tikz: true
+  tikz: true,
+  macroplan: true
 })
 </script>