fix(sidebar): largeur nettement plus grande, graduée par breakpoint

+32px (320->352) était trop subtil. Élargit franchement sur desktop :
- < 768px (mobile overlay) : w-80 (320px)
- >= 768px : w-[22rem] (352px)
- >= 1024px : w-[26rem] (416px)
- >= 1536px : w-[30rem] (480px)

Co-authored-by: Cursor <cursoragent@cursor.com>

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-full min-h-0 w-80 md:w-[22rem] 2xl:w-[26rem] shrink-0 flex flex-row overflow-hidden self-stretch',
+          'h-full min-h-0 w-80 md:w-[22rem] lg:w-[26rem] 2xl:w-[30rem] shrink-0 flex flex-row overflow-hidden self-stretch',
           'transition-transform duration-300 ease-in-out',
           isImmersiveRoute && userCollapsed
             ? '-translate-x-full'