feat: add hover effect

Memola/Features/Memo/Memo/MemoView.swift

@@ -101,6 +101,7 @@ struct MemoView: View {
                     .clipShape(.rect(cornerRadius: 8))
                     .padding(10)
             }
+            .hoverEffect(.lift)
             .transition(.move(edge: .bottom).combined(with: .blurReplace))
         }
     }

Memola/Features/Memo/PenDock/PenDock.swift

@@ -241,6 +241,7 @@ struct PenDock: View {
                     .frame(width: size + 2, height: size + 2)
             }
         }
+        .hoverEffect(.lift)
         .pickerStyle(.wheel)
         .frame(width: width * factor - 18, height: 35)
         .onChange(of: pen.thickness) { _, _ in