test: cover ScriptTypeSelect, SinglePersonHintBar, UserGroupsSection

ScriptTypeSelect: option list, placeholder disabled, value
initialisation, disabled prop propagation.

SinglePersonHintBar: hasDateFilter false vs true branches, sortDir
DESC vs ASC label switch, year-range with only fromDate fallback.

UserGroupsSection: per-group checkbox rendering, label visibility,
selectedGroupIds preselection, empty groups list, default empty
selection.

15 tests across three small primitives.

Refs #496.

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

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

@@ -0,0 +1,43 @@
+import { describe, it, expect, afterEach } from 'vitest';
+import { cleanup, render } from 'vitest-browser-svelte';
+import { page } from 'vitest/browser';
+import ScriptTypeSelect from './ScriptTypeSelect.svelte';
+
+afterEach(cleanup);
+
+describe('ScriptTypeSelect', () => {
+	it('renders the label and select', async () => {
+		render(ScriptTypeSelect, { props: { value: '' } });
+
+		await expect.element(page.getByLabelText(/schrifttyp/i)).toBeVisible();
+	});
+
+	it('renders all four option values', async () => {
+		render(ScriptTypeSelect, { props: { value: '' } });
+
+		const options = document.querySelectorAll('option');
+		const values = Array.from(options).map((o) => (o as HTMLOptionElement).value);
+		expect(values).toEqual(['', 'TYPEWRITER', 'HANDWRITING_LATIN', 'HANDWRITING_KURRENT']);
+	});
+
+	it('marks the placeholder option as disabled', async () => {
+		render(ScriptTypeSelect, { props: { value: '' } });
+
+		const placeholder = document.querySelector('option[value=""]') as HTMLOptionElement;
+		expect(placeholder.disabled).toBe(true);
+	});
+
+	it('initialises the select with the supplied value', async () => {
+		render(ScriptTypeSelect, { props: { value: 'TYPEWRITER' } });
+
+		const select = (await page.getByRole('combobox').element()) as HTMLSelectElement;
+		expect(select.value).toBe('TYPEWRITER');
+	});
+
+	it('disables the select when the disabled prop is true', async () => {
+		render(ScriptTypeSelect, { props: { value: '', disabled: true } });
+
+		const select = (await page.getByRole('combobox').element()) as HTMLSelectElement;
+		expect(select.disabled).toBe(true);
+	});
+});