refactor(geschichten): migrate TypeSelector onto SegmentedControl primitive

Refs #857
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/routes/geschichten/new/TypeSelector.svelte

@@ -1,11 +1,9 @@
 <script lang="ts">
 import { m } from '$lib/paraglide/messages.js';
-import { radioGroupNav } from '$lib/shared/actions/radioGroupNav';
+import SegmentedControl from '$lib/shared/primitives/SegmentedControl.svelte';
 
 type GeschichteType = 'STORY' | 'JOURNEY';
 
-const TYPES: GeschichteType[] = ['STORY', 'JOURNEY'];
-
 interface Props {
 	onweiter: (type: GeschichteType) => void;
 }
@@ -15,10 +13,6 @@ let { onweiter }: Props = $props();
 let selected = $state<GeschichteType | null>(null);
 let announcement = $state('');
 
-// Roving-tabindex holder: falls back to the first card so keyboard nav can start
-// even when nothing is selected (all cards at tabindex=-1 would be a keyboard dead-spot).
-const rovingFocusType = $derived(selected ?? TYPES[0]);
-
 function select(type: GeschichteType) {
 	selected = type;
 	announcement = '';
@@ -32,15 +26,10 @@ function handleWeiter() {
 	onweiter(selected);
 }
 
-const titles: Record<GeschichteType, () => string> = {
-	STORY: m.journey_selector_story_title,
-	JOURNEY: m.journey_selector_journey_title
-};
-
-const descs: Record<GeschichteType, () => string> = {
-	STORY: m.journey_selector_story_desc,
-	JOURNEY: m.journey_selector_journey_desc
-};
+const typeOptions = [
+	{ value: 'STORY', label: m.journey_selector_story_title() },
+	{ value: 'JOURNEY', label: m.journey_selector_journey_title() }
+];
 </script>
 
 <div>
@@ -48,31 +37,14 @@ const descs: Record<GeschichteType, () => string> = {
 		{m.journey_selector_question()}
 	</p>
 
-	<div
-		role="radiogroup"
-		aria-labelledby="type-selector-label"
-		class="grid grid-cols-1 gap-4 sm:grid-cols-2"
-		use:radioGroupNav={(v) => {
-			if (TYPES.includes(v as GeschichteType)) select(v as GeschichteType);
+	<SegmentedControl
+		options={typeOptions}
+		value={selected ?? ''}
+		onChange={(v) => {
+			if (v === 'STORY' || v === 'JOURNEY') select(v);
 		}}
-	>
-		{#each TYPES as type (type)}
-			<button
-				type="button"
-				role="radio"
-				value={type}
-				aria-checked={selected === type}
-				tabindex={type === rovingFocusType ? 0 : -1}
-				onclick={() => select(type)}
-				class="min-h-[64px] cursor-pointer rounded border px-4 py-3 text-left transition-colors focus:outline-none focus-visible:ring-2 focus-visible:ring-focus-ring {selected === type
-					? 'border-primary bg-primary text-primary-fg'
-					: 'border-line bg-surface text-ink hover:border-primary/50'}"
-			>
-				<span class="block font-sans text-sm font-bold">{titles[type]()}</span>
-				<span class="mt-1 block font-sans text-xs text-current opacity-70">{descs[type]()}</span>
-			</button>
-		{/each}
-	</div>
+		label={m.journey_selector_question()}
+	/>
 
 	<div aria-live="polite" aria-atomic="true" class="sr-only">{announcement}</div>
 

frontend/src/routes/geschichten/new/TypeSelector.svelte.spec.ts

@@ -18,13 +18,18 @@ describe('TypeSelector', () => {
 		await expect.element(page.getByRole('radio', { name: /Lesereise/i })).toBeVisible();
 	});
 
-	it('radiogroup is correctly labelled', async () => {
+	it('radiogroup is correctly labelled (via aria-label or aria-labelledby)', async () => {
 		render(TypeSelector, { props: { onweiter: vi.fn() } });
 
 		const group = document.querySelector('[role="radiogroup"]');
-		const labelledBy = group?.getAttribute('aria-labelledby');
+		// SegmentedControl uses aria-label; the old TypeSelector used aria-labelledby.
+		// Accept either as long as the accessible name is non-empty.
+		const ariaLabel = group?.getAttribute('aria-label') ?? '';
+		const labelledBy = group?.getAttribute('aria-labelledby') ?? '';
 		const labelEl = labelledBy ? document.getElementById(labelledBy) : null;
-		expect(labelEl?.textContent?.trim().length).toBeGreaterThan(0);
+		const hasAccessibleName =
+			ariaLabel.trim().length > 0 || (labelEl?.textContent?.trim().length ?? 0) > 0;
+		expect(hasAccessibleName).toBe(true);
 	});
 
 	it('Weiter button has aria-disabled=true when nothing is selected', async () => {