fix(quotas): unifier le décompte IA (BYOK, rollback) et combler les fuites

Centralise la réserve via ai-quota, corrige admin unavailable (-1), brancher les routes sans quota et le host-pays brainstorm, avec usage-meter élargi, noms de clusters, MCP et ajustements dashboard/insights.

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

memento-note/components/sidebar.tsx

@@ -1296,18 +1296,29 @@ export function Sidebar({ className, user }: { className?: string; user?: any })
         ref={asideRef}
         style={sidebarWidth !== null ? { width: sidebarWidth } : undefined}
         className={cn(
+          // Sur /insights replié : fixed hors flux pour que <main flex-1> s'agrandisse.
+          // Ne jamais ajouter un `relative` nu ensuite — twMerge le ferait gagner sur `fixed`
+          // et réserverait toujours l'espace (bande beige vide).
           isImmersiveRoute && userCollapsed
-            ? 'fixed inset-y-0 start-0 z-[70]'
-            : 'fixed inset-y-0 start-0 z-[70] md:relative md:z-auto',
-          sidebarWidth === null && 'w-80 md:w-[26rem] 2xl:w-[30rem]',
-          'h-full min-h-0 shrink-0 flex flex-row self-stretch relative overflow-visible',
+            ? cn(
+                'fixed inset-y-0 start-0 z-[70]',
+                isRtl ? 'translate-x-full' : '-translate-x-full',
+                'pointer-events-none',
+                sidebarWidth === null && 'w-80 md:w-[26rem] 2xl:w-[30rem]',
+              )
+            : cn(
+                'fixed inset-y-0 start-0 z-[70] md:relative md:z-auto',
+                sidebarWidth === null && 'w-80 md:w-[26rem] 2xl:w-[30rem]',
+                isMobileOpen
+                  ? 'translate-x-0 shadow-2xl'
+                  : cn(isRtl ? 'translate-x-full md:translate-x-0' : '-translate-x-full md:translate-x-0'),
+              ),
+          'h-full min-h-0 shrink-0 flex flex-row self-stretch overflow-visible',
           'transition-transform duration-300 ease-in-out',
-          isImmersiveRoute && userCollapsed
-            ? '-translate-x-full'
-            : (isMobileOpen ? 'translate-x-0 shadow-2xl' : '-translate-x-full md:translate-x-0'),
           'border-e border-border/40 bg-white/95 md:bg-white/30 backdrop-blur-md sidebar-shadow dark:border-white/6 dark:bg-[#151515] dark:backdrop-blur-none',
           className
         )}
+        aria-hidden={isImmersiveRoute && userCollapsed ? true : undefined}
       >
         {/* ── Column 1 : Rail d'icônes (54px) — inspiré du prototype ── */}
         <div className="w-[54px] border-e border-border/40 bg-[#FAF9F5] dark:bg-[#0E0E0E] flex flex-col items-center justify-between py-5 shrink-0 select-none overflow-hidden">