refactor: replaced 'medium' (size) with 'normal'

src/common/interfaces/common.ts

src/stories/components/Button/Button.stories.ts

src/stories/components/Button/Button.vue

src/stories/components/MenuDial/MenuDial.stories.ts

src/stories/components/MenuDial/MenuDial.vue

src/stories/components/SelectButton/SelectButton.stories.ts

src/stories/components/SelectButton/SelectButton.vue

src/stories/components/Slider/Slider.stories.ts

src/stories/components/Slider/Slider.vue

src/stories/components/ToggleSwitch/ToggleSwitch.stories.ts

src/stories/components/ToggleSwitch/ToggleSwitch.vue