feat(fase-10): reset list button on detail view (10.7)

A list shown at status=completed used to have its only Reset action
buried in the 3-dot menu, forcing the user back to /lists to start
over. Now the title row of /lists/[id] renders a prominent
"Reset list" pill button when status === 'completed' — reusing the
existing handleReset() handler, no new logic. The 3-dot menu entry
stays for the active and archived views.

RST-01 seeds a completed list with a checked item, clicks the new
button, verifies status flips back to active + the item gets
unchecked.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

apps/web/src/routes/(app)/lists/[id]/+page.svelte

@@ -690,6 +690,22 @@
 					>
 						{m.list_status_archived()}
 					</span>
+				{:else if list?.status === 'completed'}
+					<!-- Fase 10.7: prominent reset CTA on the completed-list view.
+					     The 3-dot menu already exposes the same action, but landing
+					     on a list you just finished and not seeing a way to start
+					     over without bouncing back to /lists is the UX trap. -->
+					<button
+						type="button"
+						data-testid="detail-reset-button"
+						onclick={handleReset}
+						class="shrink-0 inline-flex items-center gap-1.5 rounded-full bg-slate-900 px-3 py-1
+							text-xs font-semibold text-white hover:bg-slate-800
+							dark:bg-slate-50 dark:text-slate-900 dark:hover:bg-slate-200"
+					>
+						<RotateCcw size={12} strokeWidth={2} />
+						{m.list_reset()}
+					</button>
 				{/if}
 			</div>
 

apps/web/tests/e2e/reset-from-detail.test.ts

@@ -0,0 +1,72 @@
+/**
+ * RST-series: reset list from /lists/[id] (Fase 10.7).
+ *
+ * The completed-list detail view exposes a prominent "Reset list" button
+ * next to the title. Clicking it brings the list back to status='active'
+ * without leaving the page.
+ */
+import { test, expect } from '@playwright/test';
+import { USERS } from '../fixtures/users.js';
+import { loginAs } from '../fixtures/login.js';
+import { closePool, sql, COLLECTIVE_ID, BORJA_ID } from '@colectivo/test-utils';
+
+test.describe.configure({ mode: 'serial' });
+
+const created: { id: string | null } = { id: null };
+
+test.describe('Reset list from detail view (10.7)', () => {
+	test.beforeEach(async () => {
+		// Seed a completed list with one checked item.
+		const r = await sql(
+			`INSERT INTO public.shopping_lists (collective_id, name, status, completed_at, created_by)
+			 VALUES ($1, 'Reset-from-detail', 'completed', now(), $2)
+			 RETURNING id`,
+			[COLLECTIVE_ID, BORJA_ID]
+		);
+		created.id = r.rows[0].id as string;
+		await sql(
+			`INSERT INTO public.shopping_items (list_id, name, sort_order, created_by, is_checked, checked_by, checked_at)
+			 VALUES ($1, 'Milk', 1, $2, true, $2, now())`,
+			[created.id, BORJA_ID]
+		);
+	});
+
+	test.afterEach(async () => {
+		if (created.id) {
+			await sql('DELETE FROM public.shopping_lists WHERE id = $1', [created.id]);
+			created.id = null;
+		}
+	});
+
+	test.afterAll(async () => {
+		await closePool();
+	});
+
+	test('RST-01: completed list shows a Reset button that brings it back to active', async ({
+		page
+	}) => {
+		await loginAs(page, USERS.borja);
+		await page.goto(`/lists/${created.id}`);
+
+		const resetBtn = page.getByTestId('detail-reset-button');
+		await expect(resetBtn).toBeVisible({ timeout: 15_000 });
+		await resetBtn.click();
+
+		// Button should disappear once the list is back to active.
+		await expect(resetBtn).toHaveCount(0, { timeout: 5_000 });
+
+		const row = await sql(
+			'SELECT status::text AS status, completed_at FROM public.shopping_lists WHERE id = $1',
+			[created.id]
+		);
+		expect(row.rows[0].status).toBe('active');
+		expect(row.rows[0].completed_at).toBeNull();
+
+		// Items uncheked.
+		const items = await sql(
+			'SELECT bool_and(NOT is_checked) AS all_unchecked FROM public.shopping_items WHERE list_id = $1',
+			[created.id]
+		);
+		expect(items.rows[0].all_unchecked).toBe(true);
+	});
+});