test: cover four small primitives

RelationshipPill: label render, empty-string handling.
OverflowPillDisplay: +N rendering, +0 edge case, aria-hidden marker.
TimelineYAxis: max/0 labels, barAreaHeight inline style, zero handling.
TranscriptionSection: heading + textarea, initial-value hydration,
empty default.

11 tests across four small primitives.

Refs #496.

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

frontend/src/lib/document/TimelineYAxis.svelte.test.ts

@@ -0,0 +1,29 @@
+import { describe, it, expect, afterEach } from 'vitest';
+import { cleanup, render } from 'vitest-browser-svelte';
+import TimelineYAxis from './TimelineYAxis.svelte';
+
+afterEach(cleanup);
+
+describe('TimelineYAxis', () => {
+	it('renders the maxCount and 0 labels', async () => {
+		render(TimelineYAxis, { props: { maxCount: 42, barAreaHeight: 100 } });
+
+		const axis = document.querySelector('[data-testid="timeline-y-axis"]') as HTMLElement;
+		expect(axis.textContent).toContain('42');
+		expect(axis.textContent).toContain('0');
+	});
+
+	it('applies the supplied barAreaHeight as inline style', async () => {
+		render(TimelineYAxis, { props: { maxCount: 10, barAreaHeight: 250 } });
+
+		const axis = document.querySelector('[data-testid="timeline-y-axis"]') as HTMLElement;
+		expect(axis.style.height).toBe('250px');
+	});
+
+	it('renders zero count without crashing', async () => {
+		render(TimelineYAxis, { props: { maxCount: 0, barAreaHeight: 100 } });
+
+		const axis = document.querySelector('[data-testid="timeline-y-axis"]') as HTMLElement;
+		expect(axis).not.toBeNull();
+	});
+});

frontend/src/lib/document/transcription/TranscriptionSection.svelte.test.ts

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+import { describe, it, expect, afterEach } from 'vitest';
+import { cleanup, render } from 'vitest-browser-svelte';
+import { page } from 'vitest/browser';
+import TranscriptionSection from './TranscriptionSection.svelte';
+
+afterEach(cleanup);
+
+describe('TranscriptionSection', () => {
+	it('renders the section heading and textarea', async () => {
+		render(TranscriptionSection, { props: {} });
+
+		await expect.element(page.getByRole('heading', { name: /transkription/i })).toBeVisible();
+		const textarea = document.querySelector(
+			'textarea[name="transcription"]'
+		) as HTMLTextAreaElement;
+		expect(textarea).not.toBeNull();
+	});
+
+	it('hydrates the textarea with the initial transcription value', async () => {
+		render(TranscriptionSection, { props: { initialTranscription: 'Hello World' } });
+
+		const textarea = document.querySelector(
+			'textarea[name="transcription"]'
+		) as HTMLTextAreaElement;
+		expect(textarea.value).toBe('Hello World');
+	});
+
+	it('renders an empty textarea by default', async () => {
+		render(TranscriptionSection, { props: {} });
+
+		const textarea = document.querySelector(
+			'textarea[name="transcription"]'
+		) as HTMLTextAreaElement;
+		expect(textarea.value).toBe('');
+	});
+});

frontend/src/lib/person/relationship/RelationshipPill.svelte.test.ts

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+import { describe, it, expect, afterEach } from 'vitest';
+import { cleanup, render } from 'vitest-browser-svelte';
+import { page } from 'vitest/browser';
+import RelationshipPill from './RelationshipPill.svelte';
+
+afterEach(cleanup);
+
+describe('RelationshipPill', () => {
+	it('renders the supplied label', async () => {
+		render(RelationshipPill, { props: { label: 'Vater' } });
+
+		await expect.element(page.getByText('Vater')).toBeVisible();
+	});
+
+	it('renders an empty string label without crashing', async () => {
+		render(RelationshipPill, { props: { label: '' } });
+
+		const span = document.querySelector('span');
+		expect(span).not.toBeNull();
+	});
+});

frontend/src/lib/shared/primitives/OverflowPillDisplay.svelte.test.ts

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+import { describe, it, expect, afterEach } from 'vitest';
+import { cleanup, render } from 'vitest-browser-svelte';
+import OverflowPillDisplay from './OverflowPillDisplay.svelte';
+
+afterEach(cleanup);
+
+describe('OverflowPillDisplay', () => {
+	it('renders the +N count', async () => {
+		render(OverflowPillDisplay, { props: { extraCount: 3 } });
+
+		const span = document.querySelector('span') as HTMLElement;
+		expect(span.textContent?.trim()).toBe('+3');
+	});
+
+	it('renders +0 when extraCount is 0', async () => {
+		render(OverflowPillDisplay, { props: { extraCount: 0 } });
+
+		const span = document.querySelector('span') as HTMLElement;
+		expect(span.textContent?.trim()).toBe('+0');
+	});
+
+	it('marks the pill as aria-hidden (decorative)', async () => {
+		render(OverflowPillDisplay, { props: { extraCount: 5 } });
+
+		const span = document.querySelector('span') as HTMLElement;
+		expect(span.getAttribute('aria-hidden')).toBe('true');
+	});
+});