chore(storybook): localize sidebar menus and hide unused stories

src/components/label.stories.tsx

@@ -27,6 +27,8 @@ function SpecimenGrid({ states }: { states: BoardState[] }) {
 
 const meta = {
   title: "Components/Form/Label",
+  // `internal` keeps it out of the sidebar by default; Story IDs and direct URLs stay valid.
+  tags: ["internal"],
   component: Label,
   parameters: {
     layout: "padded",

src/components/toggle-group.stories.tsx

@@ -116,7 +116,8 @@ function Sizes() {
 }
 
 // No `component`: ToggleGroup props are a union (single | multiple), so Stories without args would not type-check.
-const meta = { title: "Components/Form/Toggle Group", parameters: { layout: "padded" } } satisfies Meta
+// `internal` keeps it out of the sidebar by default; Story IDs and direct URLs stay valid.
+const meta = { title: "Components/Form/Toggle Group", tags: ["internal"], parameters: { layout: "padded" } } satisfies Meta
 export default meta
 type Story = StoryObj<typeof meta>