fix(tasks): match /lists + /notes create pattern

Two concrete problems the user hit:
  1) /tasks overview had no visible "create" button — only an enter-to-submit
     input hidden behind a decorative Plus icon.
  2) /tasks/[id] add-task form had no visible submit button either.

Both now mirror the /lists + /notes pattern:

  /tasks — new "New list" button in the masthead (bg-slate-900 primary
    style matching "New list" on /lists and "New note" on /notes). Click
    creates an empty task_list and navigates to /tasks/[id] where the
    user names it inline via the new big editable title input
    (autosaves after NAME_SAVE_DEBOUNCE_MS, 500 ms — same hook as
    /lists/[id] and /notes/[id]).
  /tasks/[id] — sticky add-task footer gains a filled "+" submit button
    on the right; clicking it or pressing Enter both fire handleAdd.
    Input is now wrapped in the same rounded-lg card used on /lists/[id]
    so the two screens look identical.

i18n
  tasks_new_list = "New list" / "Nueva lista" (en / es).

Tests
  tasks.test.ts helper updated to drive the new button-then-title flow
  (same shape as lists.test.ts). T-UI-01..03 all pass.

just test-all → exit 0, 228 green, 2 skipped.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/web/messages/en.json

@@ -100,6 +100,7 @@
 	"list_finish_confirm_yes": "Yes, finish",
 	"list_finish_confirm_no": "Keep shopping",
 	"tasks_title": "Tasks",
+	"tasks_new_list": "New list",
 	"tasks_no_lists": "No task lists yet",
 	"tasks_create_first": "Create your first task list",
 	"tasks_new_list_placeholder": "New task list",

apps/web/messages/es.json

@@ -100,6 +100,7 @@
 	"list_finish_confirm_yes": "Sí, terminar",
 	"list_finish_confirm_no": "Seguir comprando",
 	"tasks_title": "Tareas",
+	"tasks_new_list": "Nueva lista",
 	"tasks_no_lists": "Sin listas de tareas",
 	"tasks_create_first": "Crea tu primera lista de tareas",
 	"tasks_new_list_placeholder": "Nueva lista de tareas",

apps/web/src/routes/(app)/tasks/+page.svelte

@@ -1,4 +1,5 @@
 <script lang="ts">
+	import { goto } from '$app/navigation';
 	import { currentCollective } from '$lib/stores/collective';
 	import { currentUser } from '$lib/stores/auth';
 	import {
@@ -12,9 +13,7 @@
 	import * as m from '$lib/paraglide/messages';
 	import ScreenMasthead from '$lib/components/ScreenMasthead.svelte';
 
-	let newName = $state('');
 	let creating = $state(false);
-	let nameInput: HTMLInputElement | undefined = $state();
 
 	$effect(() => {
 		if ($currentCollective) {
@@ -31,18 +30,14 @@
 		return () => clearInterval(id);
 	});
 
+	// Matches the /notes + /lists flow: masthead button creates an empty list
+	// and sends the user to the detail view where the name is set inline.
 	async function handleCreate() {
-		const name = newName.trim();
+		if (!$currentCollective || !$currentUser || creating) return;
-		if (!name || !$currentCollective || !$currentUser) return;
 		creating = true;
-		newName = '';
+		const created = await createTaskList($currentCollective.id, '', $currentUser.id);
-		await createTaskList($currentCollective.id, name, $currentUser.id);
 		creating = false;
-		nameInput?.focus();
+		if (created) await goto(`/tasks/${created.id}`);
-	}
-
-	function handleKeydown(e: KeyboardEvent) {
-		if (e.key === 'Enter') handleCreate();
 	}
 
 	async function handleDelete(id: string) {
@@ -54,7 +49,19 @@
 <svelte:head><title>{m.tasks_title()} — Colectivo</title></svelte:head>
 
 <div class="flex h-full flex-col overflow-hidden">
-	<ScreenMasthead label={m.masthead_tasks_label()} title={m.tasks_title()} />
+	<ScreenMasthead label={m.masthead_tasks_label()} title={m.tasks_title()}>
+		{#snippet actions()}
+			<button
+				type="button"
+				onclick={handleCreate}
+				disabled={creating || !$currentCollective}
+				class="ml-1 inline-flex items-center gap-1 rounded-md bg-slate-900 px-3 py-1.5 text-sm font-medium text-white hover:bg-slate-800 disabled:opacity-60 dark:bg-slate-100 dark:text-slate-900"
+			>
+				<Plus size={14} strokeWidth={2} />
+				{m.tasks_new_list()}
+			</button>
+		{/snippet}
+	</ScreenMasthead>
 
 	<div class="flex-1 overflow-y-auto px-4 py-4 md:px-6 md:py-6">
 		{#if $taskListsLoading && $taskLists.length === 0}
@@ -85,17 +92,4 @@
 		{/if}
 	</div>
 
-	<div class="border-t border-black/5 bg-surface-raised px-6 py-4 dark:border-white/5">
-		<div class="flex items-center gap-2">
-			<Plus size={16} strokeWidth={1.5} class="text-text-secondary" />
-			<input
-				bind:this={nameInput}
-				bind:value={newName}
-				onkeydown={handleKeydown}
-				placeholder={m.tasks_new_list_placeholder()}
-				class="flex-1 bg-transparent text-sm text-text-primary placeholder:text-text-secondary focus:outline-none"
-				disabled={creating || !$currentCollective}
-			/>
-		</div>
-	</div>
 </div>

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

@@ -12,7 +12,8 @@
 		renameTask,
 		completeTask,
 		deleteTask,
-		reorderTasks
+		reorderTasks,
+		renameTaskList
 	} from '$lib/stores/tasks';
 	import { getSupabase } from '$lib/supabase';
 	import type { Task, TaskList } from '@colectivo/types';
@@ -25,6 +26,11 @@
 	let tasks = $state<Task[]>([]);
 	let loading = $state(true);
 
+	// Inline rename of the task list (same pattern as /lists/[id], /notes/[id]).
+	let listName = $state('');
+	let nameSaveTimer: ReturnType<typeof setTimeout> | null = null;
+	const NAME_SAVE_DEBOUNCE_MS = 500;
+
 	let newTitle = $state('');
 	let titleInput: HTMLInputElement | undefined = $state();
 
@@ -48,6 +54,7 @@
 		}
 
 		list = listRes.data as TaskList;
+		listName = list.name ?? '';
 		tasks = tasksRes;
 		loading = false;
 
@@ -91,10 +98,32 @@
 		}, 5_000);
 	});
 
-	onDestroy(() => {
+	onDestroy(async () => {
 		if (pollingId) clearInterval(pollingId);
+		if (nameSaveTimer) {
+			clearTimeout(nameSaveTimer);
+			await flushNameSave();
+		}
 	});
 
+	// ── Inline rename ──────────────────────────────────────────────────────────
+
+	function scheduleNameSave() {
+		if (nameSaveTimer) clearTimeout(nameSaveTimer);
+		nameSaveTimer = setTimeout(() => {
+			nameSaveTimer = null;
+			void flushNameSave();
+		}, NAME_SAVE_DEBOUNCE_MS);
+	}
+
+	async function flushNameSave() {
+		if (!list) return;
+		const next = listName.trim();
+		if (next === (list.name ?? '')) return;
+		list = { ...list, name: next };
+		await renameTaskList(list.id, next);
+	}
+
 	function nameFor(userId: string | null): string {
 		if (!userId) return '';
 		const member = $collectiveMembers.find((mm) => mm.user_id === userId);
@@ -196,10 +225,27 @@
 		<a href="/tasks" class="rounded p-1 text-text-secondary hover:bg-black/5 dark:hover:bg-white/5" aria-label={m.notes_back_to_board()}>
 			<ArrowLeft size={18} strokeWidth={1.5} />
 		</a>
-		<h1 class="text-base font-semibold text-text-primary">{list?.name ?? ''}</h1>
+		<h1 class="truncate text-[15px] font-medium text-text-secondary md:hidden">
+			{list?.name || m.tasks_new_list_placeholder()}
+		</h1>
 	</header>
 
-	<div class="flex-1 overflow-y-auto px-6 py-4">
+	<div class="flex-1 overflow-y-auto px-4 py-4 md:px-6">
+		<!-- Inline rename title input (autosave on idle) -->
+		<div class="pt-2 pb-4 md:pt-4 md:pb-6">
+			<p class="mb-1 text-[13px] font-semibold uppercase tracking-[0.05em] text-text-secondary">
+				{m.masthead_tasks_label()}
+			</p>
+			<input
+				bind:value={listName}
+				oninput={scheduleNameSave}
+				onblur={flushNameSave}
+				placeholder={m.tasks_new_list_placeholder()}
+				class="w-full bg-transparent text-[26px] md:text-[32px] font-semibold tracking-[-0.02em] text-text-primary placeholder:text-text-secondary focus:outline-none"
+				aria-label={m.tasks_new_list_placeholder()}
+			/>
+		</div>
+
 		{#if loading}
 			<p class="text-sm text-text-secondary">{m.loading()}</p>
 		{:else if tasks.length === 0}
@@ -312,16 +358,26 @@
 	</div>
 
 	<!-- Sticky add-task input -->
-	<div class="border-t border-black/5 bg-surface-raised px-6 py-4 dark:border-white/5">
+	<div class="border-t border-black/5 bg-surface-raised px-4 py-3 md:px-6 md:py-4 dark:border-white/5">
 		<div class="flex items-center gap-2">
-			<Plus size={16} strokeWidth={1.5} class="text-text-secondary" />
+			<div class="flex flex-1 items-center gap-2 rounded-lg bg-surface px-3 py-2 shadow-[0px_2px_8px_rgba(15,23,42,0.06)]">
-			<input
+				<input
-				bind:this={titleInput}
+					bind:this={titleInput}
-				bind:value={newTitle}
+					bind:value={newTitle}
-				onkeydown={handleKeydown}
+					onkeydown={handleKeydown}
-				placeholder={m.tasks_new_task_placeholder()}
+					placeholder={m.tasks_new_task_placeholder()}
-				class="flex-1 bg-transparent text-sm text-text-primary placeholder:text-text-secondary focus:outline-none"
+					class="min-w-0 flex-1 bg-transparent text-sm text-text-primary placeholder:text-text-secondary focus:outline-none"
-			/>
+				/>
+			</div>
+			<button
+				type="button"
+				onclick={handleAdd}
+				disabled={!newTitle.trim()}
+				aria-label={m.add()}
+				class="flex h-10 w-10 shrink-0 items-center justify-center rounded-lg bg-slate-900 text-white hover:opacity-90 disabled:opacity-40 dark:bg-slate-100 dark:text-slate-900 transition-opacity"
+			>
+				<Plus size={18} strokeWidth={2} />
+			</button>
 		</div>
 	</div>
 </div>

apps/web/tests/e2e/tasks.test.ts

@@ -14,17 +14,20 @@ const NEW_TASK_PLACEHOLDER = /add task|añadir tarea/i;
 
 async function gotoTasksClean(page: Page) {
 	await page.goto('/tasks');
-	await expect(page.getByPlaceholder(NEW_LIST_PLACEHOLDER)).toBeVisible({ timeout: 15_000 });
+	await expect(
+		page.getByRole('button', { name: /new list|nueva lista/i })
+	).toBeVisible({ timeout: 15_000 });
 }
 
 async function createTaskList(page: Page, name: string) {
-	const input = page.getByPlaceholder(NEW_LIST_PLACEHOLDER);
+	// Masthead "New list" button → creates empty list and navigates to the detail.
-	await input.fill(name);
+	await page.getByRole('button', { name: /new list|nueva lista/i }).click();
-	await input.press('Enter');
+	await expect(page).toHaveURL(/\/tasks\/[0-9a-f-]+$/, { timeout: 10_000 });
-	const heading = page.getByRole('heading', { name: new RegExp(`^${name}$`) });
+	const titleInput = page.getByPlaceholder(NEW_LIST_PLACEHOLDER);
-	await expect(heading).toBeVisible({ timeout: 5_000 });
+	await expect(titleInput).toBeVisible({ timeout: 10_000 });
-	await heading.click();
+	await titleInput.fill(name);
-	await expect(page).toHaveURL(/\/tasks\/[0-9a-f-]+$/, { timeout: 5_000 });
+	await titleInput.blur();
+	await page.waitForTimeout(900); // autosave debounce
 }
 
 test.describe('Tasks — member (Borja)', () => {