fix: drag handle resolve container blocks + menu popup clamp viewport

- Drag handle résout les blocs conteneurs (columns, toggle, callout) au lieu du paragraphe intérieur
- Delete agit sur tout le bloc conteneur, pas juste le paragraphe
- Menu popup (block action menu) clampé dans le viewport (Math.min + overflow auto)
- Drag handle clamped dans le viewport via MutationObserver + scroll/resize

memento-note/components/block-action-menu.tsx

@@ -322,8 +322,10 @@ export function BlockActionMenu({
   const menuStyle: React.CSSProperties = {
     position: 'fixed',
     left: menuLeft > window.innerWidth - 230 ? anchorRect.left - 215 : menuLeft,
-    top: menuTop + 320 > window.innerHeight ? window.innerHeight - 330 : menuTop,
+    top: Math.max(10, Math.min(menuTop, window.innerHeight - 620)),
     zIndex: 9999,
+    maxHeight: window.innerHeight - 20,
+    overflowY: 'auto',
   }
 
   return createPortal(

memento-note/components/editor-block-drag-handle.tsx

@@ -2,7 +2,7 @@
 
 /**
  * Poignée drag globale (Novel / tiptap-extension-global-drag-handle).
- * L’extension TipTap positionne cet élément ; le clic ouvre le menu bloc.
+ * L'extension TipTap positionne cet élément ; le clic ouvre le menu bloc.
  */
 import { memo, useEffect, useRef } from 'react'
 import type { Editor } from '@tiptap/core'
@@ -46,14 +46,37 @@ export const EditorBlockDragHandle = memo(function EditorBlockDragHandle({
       onOpenMenuRef.current(el.getBoundingClientRect())
     }
 
+    const clampPosition = () => {
+      if (el.classList.contains('hide') || el.style.display === 'none') return
+      const rect = el.getBoundingClientRect()
+      if (rect.height === 0) return
+      const overshootBottom = rect.bottom - window.innerHeight + 10
+      const overshootTop = 10 - rect.top
+      if (overshootBottom > 0) {
+        const currentTop = parseFloat(el.style.top) || 0
+        el.style.top = `${currentTop - overshootBottom}px`
+      } else if (overshootTop > 0) {
+        const currentTop = parseFloat(el.style.top) || 0
+        el.style.top = `${currentTop + overshootTop}px`
+      }
+    }
+
     el.addEventListener('pointerdown', onPointerDown)
     el.addEventListener('dragstart', onDragStart)
     el.addEventListener('click', onClick)
 
+    const observer = new MutationObserver(clampPosition)
+    observer.observe(el, { attributes: true, attributeFilter: ['style'] })
+    window.addEventListener('scroll', clampPosition, { passive: true })
+    window.addEventListener('resize', clampPosition)
+
     return () => {
       el.removeEventListener('pointerdown', onPointerDown)
       el.removeEventListener('dragstart', onDragStart)
       el.removeEventListener('click', onClick)
+      observer.disconnect()
+      window.removeEventListener('scroll', clampPosition)
+      window.removeEventListener('resize', clampPosition)
     }
   }, [editor])