feat(#221): add parent selector and color picker to admin tag edit form

Tag edit form gains a parent <select> listing all other tags (self
excluded) and a 10-swatch color picker that is only shown when no
parent is selected. Submitting passes parentId and color to the PUT
/api/tags/{id} endpoint via TagUpdateDTO.

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

frontend/src/routes/admin/tags/[id]/+page.server.ts

@@ -15,9 +15,13 @@ export const actions: Actions = {
 		const data = await request.formData();
 		const api = createApiClient(fetch);
 
+		const name = data.get('name') as string;
+		const parentId = (data.get('parentId') as string) || null;
+		const color = (data.get('color') as string) || null;
+
 		const result = await api.PUT('/api/tags/{id}', {
 			params: { path: { id: params.id } },
-			body: { name: data.get('name') as string }
+			body: { name, parentId: parentId ?? undefined, color: color ?? undefined }
 		});
 
 		if (!result.response.ok) {

frontend/src/routes/admin/tags/[id]/+page.svelte

@@ -11,6 +11,29 @@ const deleteEnabled = $derived(deleteConfirmName === data.tag.name);
 
 const unsaved = createUnsavedWarning();
 
+function getInitialParentId() {
+	return data.tag.parentId ?? '';
+}
+function getInitialColor() {
+	return data.tag.color ?? '';
+}
+
+let parentId = $state(getInitialParentId());
+let selectedColor = $state(getInitialColor());
+
+const colors = [
+	'sage',
+	'sienna',
+	'amber',
+	'slate',
+	'violet',
+	'rose',
+	'cobalt',
+	'moss',
+	'sand',
+	'coral'
+];
+
 $effect(() => {
 	if (form?.success) unsaved.clearOnSuccess();
 });
@@ -21,6 +44,7 @@ $effect(() => {
 	<div class="flex items-center border-b border-line px-5 py-3">
 		<a
 			href="/admin/tags"
+			aria-label="Zurück zur Tag-Übersicht"
 			class="mr-3 inline-flex items-center gap-1 text-xs text-ink-3 hover:text-ink md:hidden"
 		>
 			<svg
@@ -64,7 +88,7 @@ $effect(() => {
 			oninput={unsaved.markDirty}
 			class="mb-5"
 		>
-			<div class="rounded-sm border border-line bg-surface p-5 shadow-sm">
+			<div class="mb-5 rounded-sm border border-line bg-surface p-5 shadow-sm">
 				<h3 class="mb-3 text-xs font-bold tracking-widest text-ink-3 uppercase">
 					{m.admin_col_name()}
 				</h3>
@@ -77,6 +101,61 @@ $effect(() => {
 					class="w-full rounded-sm border border-line bg-surface px-3 py-2 text-sm text-ink focus:outline-none focus-visible:ring-2 focus-visible:ring-focus-ring"
 				/>
 			</div>
+
+			<!-- Parent selector -->
+			<div class="mb-5 rounded-sm border border-line bg-surface p-5 shadow-sm">
+				<h3 class="mb-3 text-xs font-bold tracking-widest text-ink-3 uppercase">
+					Übergeordnetes Schlagwort
+				</h3>
+				<label for="parentId" class="mb-1 block text-xs font-medium text-ink-2">
+					Übergeordnetes Schlagwort
+				</label>
+				<select
+					id="parentId"
+					name="parentId"
+					bind:value={parentId}
+					class="w-full rounded-sm border border-line bg-surface px-3 py-2 text-sm text-ink focus:outline-none focus-visible:ring-2 focus-visible:ring-focus-ring"
+				>
+					<option value="">Kein übergeordnetes Schlagwort</option>
+					{#each data.tags.filter((t) => t.id !== data.tag.id) as tag (tag.id)}
+						<option value={tag.id}>{tag.name}</option>
+					{/each}
+				</select>
+			</div>
+
+			<!-- Color picker (only shown when no parent selected) -->
+			{#if parentId === ''}
+				<div
+					data-testid="color-picker"
+					class="mb-5 rounded-sm border border-line bg-surface p-5 shadow-sm"
+				>
+					<h3 class="mb-3 text-xs font-bold tracking-widest text-ink-3 uppercase">Farbe</h3>
+					<div class="mb-3 flex flex-wrap gap-2" role="group" aria-label="Farbe auswählen">
+						{#each colors as colorName (colorName)}
+							<button
+								type="button"
+								data-testid="color-swatch-{colorName}"
+								aria-pressed={selectedColor === colorName ? 'true' : 'false'}
+								aria-label={colorName}
+								style="background-color: var(--c-tag-{colorName})"
+								class="h-8 w-8 rounded-full {selectedColor === colorName ? 'ring-2 ring-current ring-offset-2' : ''}"
+								onclick={() => {
+									selectedColor = selectedColor === colorName ? '' : colorName;
+								}}
+							></button>
+						{/each}
+						<button
+							type="button"
+							class="flex h-8 w-8 items-center justify-center rounded-full border border-line bg-surface text-sm text-ink-3 hover:text-ink"
+							onclick={() => { selectedColor = ''; }}
+							aria-label="Farbe zurücksetzen">×</button
+						>
+					</div>
+					<input type="hidden" name="color" value={selectedColor} />
+				</div>
+			{:else}
+				<input type="hidden" name="color" value="" />
+			{/if}
 		</form>
 
 		<!-- Danger zone -->

frontend/src/routes/admin/tags/[id]/page.svelte.spec.ts

@@ -9,7 +9,10 @@ vi.mock('$app/navigation', () => ({ beforeNavigate: vi.fn(), goto: vi.fn() }));
 import { beforeNavigate, goto } from '$app/navigation';
 
 const baseTag = { id: 't1', name: 'Familie' };
-const baseData = { tag: baseTag };
+const baseData = {
+	tag: baseTag,
+	tags: [] as { id: string; name: string; parentId?: string; color?: string }[]
+};
 
 afterEach(cleanup);
 
@@ -91,3 +94,74 @@ describe('Admin edit tag page – unsaved-changes guard', () => {
 		expect(vi.mocked(goto)).toHaveBeenCalledWith('http://localhost/admin/tags/t2');
 	});
 });
+
+// ─── Parent selector ──────────────────────────────────────────────────────────
+
+describe('Admin edit tag page – parent selector', () => {
+	it('renders a parent selector', async () => {
+		render(Page, { data: baseData, form: null });
+		await expect.element(page.getByRole('combobox', { name: /übergeordnet/i })).toBeInTheDocument();
+	});
+
+	it('shows other tags in the parent selector', async () => {
+		render(Page, {
+			data: {
+				tag: { id: 't1', name: 'Familie' },
+				tags: [
+					{ id: 't1', name: 'Familie' },
+					{ id: 't2', name: 'Reise' }
+				]
+			},
+			form: null
+		});
+		await expect.element(page.getByRole('option', { name: 'Reise' })).toBeInTheDocument();
+	});
+
+	it('does not show self in the parent selector', async () => {
+		render(Page, {
+			data: {
+				tag: { id: 't1', name: 'Familie' },
+				tags: [
+					{ id: 't1', name: 'Familie' },
+					{ id: 't2', name: 'Reise' }
+				]
+			},
+			form: null
+		});
+		const options = document.querySelectorAll<HTMLOptionElement>('select[name="parentId"] option');
+		const values = Array.from(options).map((o) => o.value);
+		expect(values).not.toContain('t1');
+	});
+});
+
+// ─── Color picker ─────────────────────────────────────────────────────────────
+
+describe('Admin edit tag page – color picker', () => {
+	it('renders color picker when tag has no parent', async () => {
+		render(Page, {
+			data: { tag: { id: 't1', name: 'Familie', parentId: undefined }, tags: [] },
+			form: null
+		});
+		await expect.element(page.getByTestId('color-picker')).toBeInTheDocument();
+	});
+
+	it('hides color picker when tag already has a parent', async () => {
+		render(Page, {
+			data: {
+				tag: { id: 't1', name: 'Familie', parentId: 't2' },
+				tags: [{ id: 't2', name: 'Reise' }]
+			},
+			form: null
+		});
+		await expect.element(page.getByTestId('color-picker')).not.toBeInTheDocument();
+	});
+
+	it('pre-selects the current tag color in the color picker', async () => {
+		render(Page, {
+			data: { tag: { id: 't1', name: 'Familie', color: 'sage' }, tags: [] },
+			form: null
+		});
+		const selected = page.getByTestId('color-swatch-sage');
+		await expect.element(selected).toHaveAttribute('aria-pressed', 'true');
+	});
+});

frontend/src/routes/page.svelte.spec.ts

@@ -31,7 +31,8 @@ const emptyData = {
 		tags: [],
 		sort: 'DATE' as const,
 		dir: 'desc' as const,
-		tagQ: ''
+		tagQ: '',
+		tagOp: 'AND'
 	},
 	documents: [],
 	total: 0,