fix: sidebar hauteur — chaîne de dépendance au lieu de 100vh redondant

Root cause (expert analysis): h-screen sur aside ET parent = 2 calculs
100vh indépendants → 1px de différence en prod (subpixel, scrollbar).

Fix:
- aside: h-screen → h-full (dépend du parent, 1 seule source 100vh)
- body: h-screen overflow-hidden (verrouille le viewport, empêche scroll parasite)
- Suspense fallback: h-screen → h-full (cohérent)

memento-note/components/sidebar.tsx

@@ -1182,7 +1182,7 @@ export function Sidebar({ className, user }: { className?: string; user?: any })
           isImmersiveRoute && userCollapsed
             ? 'fixed inset-y-0 start-0 z-[70]'
             : 'fixed inset-y-0 start-0 z-[70] md:relative md:z-auto',
-          'h-screen min-h-0 w-80 xl:w-[22rem] 2xl:w-[26rem] shrink-0 flex flex-row overflow-hidden self-stretch',
+          'h-full min-h-0 w-80 xl:w-[22rem] 2xl:w-[26rem] shrink-0 flex flex-row overflow-hidden self-stretch',
           'transition-transform duration-300 ease-in-out',
           isImmersiveRoute && userCollapsed
             ? '-translate-x-full'