fix(frontend): QUEUED badge test, touch target on dismiss button, focus ring on expand toggle

Add missing test coverage for the amber QUEUED status badge in TrainingHistory.
Fix WCAG 2.2 minimum touch target (24 × 24 px) on the success-message dismiss
button in OcrTrainingCard. Add focus-visible ring to the expand/collapse toggle
in TrainingHistory so keyboard users get a visible focus indicator.

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

frontend/src/lib/components/OcrTrainingCard.svelte

@@ -82,7 +82,7 @@ async function startTraining() {
 			{successMessage}
 			<button
 				type="button"
-				class="underline hover:no-underline"
+				class="ml-1 inline-flex h-6 w-6 items-center justify-center rounded-sm underline hover:no-underline focus-visible:ring-2 focus-visible:ring-brand-navy focus-visible:outline-none"
 				onclick={() => (successMessage = null)}
 				aria-label={m.comp_dismiss()}>×</button
 			>

frontend/src/lib/components/TrainingHistory.svelte

@@ -146,7 +146,7 @@ function formatCer(cer: number | undefined | null): string {
 			type="button"
 			aria-expanded={expanded}
 			aria-controls="training-history-rows"
-			class="text-xs font-medium text-ink-3 transition-colors hover:text-ink"
+			class="rounded-sm py-2 text-xs font-medium text-ink-3 transition-colors hover:text-ink focus-visible:ring-2 focus-visible:ring-brand-navy focus-visible:ring-offset-1 focus-visible:outline-none"
 			onclick={() => (expanded = !expanded)}
 		>
 			{expanded ? m.comp_expandable_show_less() : m.comp_expandable_show_more()}

frontend/src/lib/components/TrainingHistory.svelte.spec.ts

@@ -51,6 +51,15 @@ describe('TrainingHistory — expand/collapse', () => {
 	});
 });
 
+describe('TrainingHistory — status badges', () => {
+	it('shows amber QUEUED badge for queued runs', async () => {
+		const run = { ...makeRun(0), status: 'QUEUED' as const };
+		render(TrainingHistory, { runs: [run] });
+
+		await expect.element(page.getByText(/Warteschlange/i)).toBeInTheDocument();
+	});
+});
+
 describe('TrainingHistory — type and person columns', () => {
 	it('shows "Basis" for runs without personId', async () => {
 		render(TrainingHistory, { runs: [makeRun(0)] });