style(notes): blue-700 floating button and pointer cursor

src/components/FloatingButton.tsx

@@ -9,7 +9,7 @@ function FloatingButton({ onClick, label = 'Créer une note' }: FloatingButtonPr
       type="button"
       onClick={onClick}
       aria-label={label}
-      className="fixed bottom-6 right-6 z-20 flex h-14 w-14 items-center justify-center rounded-full bg-amber-400 text-3xl text-gray-800 shadow-lg transition-transform hover:bg-amber-500 active:scale-95 focus:outline-none focus:ring-2 focus:ring-amber-600 focus:ring-offset-2"
+      className="fixed bottom-6 right-6 z-20 flex h-14 w-14 items-center justify-center rounded-full bg-blue-700 text-3xl text-white shadow-lg transition-transform hover:bg-blue-800 active:scale-95 focus:outline-none focus:ring-2 focus:ring-blue-800 focus:ring-offset-2"
     >
       +
     </button>

src/style.css

@@ -3,5 +3,6 @@
 @layer base {
   button {
     touch-action: manipulation;
+    cursor: pointer;
   }
 }