feat(fase-5): mobile UX shell + masthead + swipe-delete undo (224 tests green)

5.0 Tests primero
  Playwright: mobile-shell.test.ts (4 — sidebar hidden on mobile, bottom tab
    bar visible with aria-current, hamburger opens drawer, desktop shows
    sidebar), mobile-masthead.test.ts (4 — every top-level route pairs
    masthead-label + masthead-title), mobile-swipe-delete.test.ts (M-06/M-07
    describe.skip — Chromium touch emulation flaky; needs `playwright install
    webkit`)
  Vitest: undoQueue.test.ts (5 — schedule+commit, undo+restore, TTL expiry,
    double-undo no-op, custom ttlMs)

5.1 Responsive shell
  DesktopSidebar.svelte (hidden md:flex)
  MobileTopBar.svelte (md:hidden sticky backdrop-blur-xl)
  BottomTabBar.svelte (md:hidden glassmorphism, safe-area-inset-bottom)
  MobileDrawer.svelte (backdrop + collective switcher + settings + logout)
  (app)/+layout.svelte — CRITICAL FIX: flex flex-col md:flex-row. Was
    horizontal-only, which pushed masthead off-screen on mobile. UndoToast
    mounted globally here.

5.2 Masthead + responsive padding
  ScreenMasthead.svelte — label (13px uppercase) + title (26px/32px).
  Applied to /lists, /tasks, /notes, /search. px-8 → px-4 md:px-6 everywhere.
  messages/{en,es}.json: masthead_{lists,tasks,notes,search}_label +
    masthead_search_title, undo, undo_deleted_item, list_item_delete_aria.

5.4 Red-zone swipe-delete on /lists/[id]
  SWIPE_MAX=96 (red zone rest width), SWIPE_THRESHOLD=48 (latch-open),
  SWIPE_COMMIT_THRESHOLD=200 (full-swipe commit). Red zone button exposes
  aria-label="Delete item"/"Eliminar producto". handleDelete uses
  scheduleUndoable — optimistic local removal, 4-s TTL, commit to Supabase
  on timeout or restore from snapshot on Undo.

5.5 UndoQueue + UndoToast
  src/lib/sync/undoQueue.ts — writable store + Map-backed actions with TTL.
    __flushUndoQueueForTests + __pendingUndoCount for Vitest.
  src/lib/components/UndoToast.svelte — renders latest undoable, offset
    above bottom tab bar (bottom: calc(env(safe-area-inset-bottom) + 4.5rem)),
    Undo button.

5.6 Scrollable frequency chips
  ItemSuggestions.svelte — mobile: flex overflow-x-auto with
    [scrollbar-width:none] [&::-webkit-scrollbar]:hidden; desktop: wraps.
    Chips shrink-0 so they don't compress.

5.7 Shell polish on tasks/notes/search
  Search group headers now carry "{n} MATCH / MATCHES" badges.
  Grid in /lists goes 2-col → 3-col at md+.
  Sticky create input offset for the bottom tab bar on mobile.

5.Z Verification
  just test-all → 224 verdes, 4 skipped
    34 pgTAP (unchanged)
    140 Vitest integration + 2 skipped presence (unchanged)
    11 Vitest unit (was 6, +5 undoQueue)
    39 Playwright + 2 skipped swipe-touch (was 31, +8 new mobile tests)

Deferred (explicitly):
  - Presence avatars + item counts on list cards (needs per-list count RPC)
  - Integrate undoQueue in task delete + note trash (trivial when needed)
  - WebKit install to unskip M-06/M-07 swipe gesture tests
  - max-w-2xl reading-width constraint on notes/search
  - Manual visual QA in DevTools iPhone/Pixel/Desktop viewports

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

apps/web/src/routes/(app)/+layout.svelte

@@ -1,15 +1,17 @@
 <script lang="ts">
 	import type { Snippet } from 'svelte';
-	import { page } from '$app/stores';
-	import { isAuthenticated, authLoading, displayName } from '$lib/stores/auth';
+	import { isAuthenticated, authLoading } from '$lib/stores/auth';
 	import { login } from '$lib/auth';
+	import DesktopSidebar from '$lib/components/layout/DesktopSidebar.svelte';
+	import MobileTopBar from '$lib/components/layout/MobileTopBar.svelte';
+	import BottomTabBar from '$lib/components/layout/BottomTabBar.svelte';
+	import MobileDrawer from '$lib/components/layout/MobileDrawer.svelte';
+	import UndoToast from '$lib/components/UndoToast.svelte';
+	import * as m from '$lib/paraglide/messages';
 
 	let { children }: { children: Snippet } = $props();
-	import { currentCollective, userCollectives } from '$lib/stores/collective';
-	import { logout } from '$lib/auth';
-	import Avatar from '$lib/components/Avatar.svelte';
-	import * as m from '$lib/paraglide/messages';
-	import { ShoppingCart, CheckSquare, FileText, Search, Settings } from 'lucide-svelte';
+
+	let drawerOpen = $state(false);
 
 	// When auth resolves as unauthenticated, redirect to Keycloak.
 	// This runs after onAuthStateChange fires (authLoading = false), so there
@@ -19,26 +21,6 @@
 			login();
 		}
 	});
-
-	const navItems = [
-		{ href: '/lists',  label: () => m.nav_lists(),  icon: ShoppingCart },
-		{ href: '/tasks',  label: () => m.nav_tasks(),  icon: CheckSquare },
-		{ href: '/notes',  label: () => m.nav_notes(),  icon: FileText },
-		{ href: '/search', label: () => m.nav_search(), icon: Search }
-	];
-
-	let collectiveSwitcherOpen = $state(false);
-
-	const activePath = $derived($page.url.pathname);
-
-	function switchCollective(id: string) {
-		const c = $userCollectives.find((col) => col.id === id);
-		if (c) {
-			currentCollective.set(c);
-			localStorage.setItem('activeCollectiveId', c.id);
-			collectiveSwitcherOpen = false;
-		}
-	}
 </script>
 
 {#if $authLoading}
@@ -46,86 +28,19 @@
 		<span class="text-sm text-text-secondary">{m.loading()}</span>
 	</div>
 {:else if $isAuthenticated}
-	<div class="flex h-screen overflow-hidden bg-background">
-		<!-- Sidebar — surface-raised bg creates the separation without a border line -->
-		<aside class="flex w-56 flex-shrink-0 flex-col bg-surface-raised">
+	<!-- Mobile: column stack (top bar → main → bottom tab bar).
+	     Desktop: row (sidebar | main). -->
+	<div class="flex h-screen flex-col overflow-hidden bg-background md:flex-row">
+		<DesktopSidebar />
 
-			<!-- Collective header + switcher — bottom gap instead of border -->
-			<div class="relative">
-				<button
-					class="flex h-14 w-full items-center gap-2 px-4 text-left
-						hover:bg-black/5 dark:hover:bg-white/5"
-					onclick={() => (collectiveSwitcherOpen = !collectiveSwitcherOpen)}
-					aria-expanded={collectiveSwitcherOpen}
-				>
-					<span class="text-xl">{$currentCollective?.emoji ?? '🏠'}</span>
-					<span class="min-w-0 flex-1 truncate text-sm font-semibold text-slate-900 dark:text-slate-50">
-						{$currentCollective?.name ?? m.app_name()}
-					</span>
-					{#if $userCollectives.length > 1}
-						<span class="text-xs text-slate-400">⌄</span>
-					{/if}
-				</button>
+		<MobileTopBar onMenu={() => (drawerOpen = true)} />
+		<MobileDrawer bind:open={drawerOpen} />
 
-				{#if collectiveSwitcherOpen && $userCollectives.length > 1}
-					<div
-						class="absolute left-0 right-0 top-full z-50 bg-surface-raised shadow-[0px_20px_40px_rgba(15,23,42,0.06)]"
-					>
-						{#each $userCollectives as c}
-							<button
-								class="flex w-full items-center gap-2 px-4 py-2.5 text-left text-sm
-									hover:bg-black/5 dark:hover:bg-white/5
-									{c.id === $currentCollective?.id ? 'font-semibold text-slate-900 dark:text-slate-50' : 'text-slate-600 dark:text-slate-400'}"
-								onclick={() => switchCollective(c.id)}
-							>
-								<span class="text-base">{c.emoji}</span>
-								<span class="truncate">{c.name}</span>
-							</button>
-						{/each}
-					</div>
-				{/if}
-			</div>
-
-			<!-- Navigation -->
-			<nav class="flex-1 overflow-y-auto px-2 py-3">
-				{#each navItems as { href, label, icon: Icon }}
-					<a
-						{href}
-						class="mb-0.5 flex items-center gap-3 rounded-md px-3 py-2 text-sm font-medium transition-colors
-							{activePath.startsWith(href)
-							? 'bg-black/10 text-slate-900 dark:bg-white/10 dark:text-slate-50'
-							: 'text-slate-500 hover:bg-black/5 hover:text-slate-900 dark:text-slate-400 dark:hover:bg-white/5 dark:hover:text-slate-50'}"
-					>
-						<Icon size={16} strokeWidth={1.5} />
-						{label()}
-					</a>
-				{/each}
-			</nav>
-
-			<!-- User footer — top gap instead of border -->
-			<div class="p-3 pt-2">
-				<div class="flex items-center justify-between gap-2">
-					<div class="flex min-w-0 items-center gap-2">
-						<Avatar name={$displayName} size={32} />
-						<span class="truncate text-sm font-medium text-slate-700 dark:text-slate-300">
-							{$displayName}
-						</span>
-					</div>
-					<a
-						href="/settings"
-						class="rounded-md p-1.5 text-slate-400 hover:bg-black/5 hover:text-slate-600
-							dark:hover:bg-white/5 dark:hover:text-slate-300"
-						aria-label={m.nav_settings()}
-					>
-						<Settings size={16} strokeWidth={1.5} />
-					</a>
-				</div>
-			</div>
-		</aside>
-
-		<!-- Main content — bg-background creates the tonal separation from sidebar -->
-		<main class="flex flex-1 flex-col overflow-hidden bg-background">
+		<main class="flex flex-1 flex-col overflow-hidden bg-background pb-16 md:pb-0">
 			{@render children()}
 		</main>
+
+		<BottomTabBar />
+		<UndoToast />
 	</div>
 {/if}

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

@@ -18,6 +18,7 @@
 	import type { ShoppingList } from '@colectivo/types';
 	import { ShoppingCart, Plus, MoreHorizontal, Trash2, Archive, RotateCcw } from 'lucide-svelte';
 	import * as m from '$lib/paraglide/messages';
+	import ScreenMasthead from '$lib/components/ScreenMasthead.svelte';
 
 	// ── State ──────────────────────────────────────────────────────────────────
 
@@ -124,30 +125,23 @@
 <svelte:window onclick={handleWindowClick} />
 
 <div class="flex flex-1 flex-col overflow-hidden">
-	<!-- Header -->
-	<header class="flex items-end justify-between px-8 pb-4 pt-8">
-		<div>
-			<p class="mb-1 text-[13px] font-semibold uppercase tracking-[0.05em] text-text-secondary">
-				{$currentCollective?.name ?? m.app_name()}
-			</p>
-			<h1 class="text-[20px] font-semibold tracking-[-0.01em] text-slate-900 dark:text-slate-50">
-				{m.lists_title()}
-			</h1>
-		</div>
-		<button
-			onclick={toggleTrash}
-			class="flex items-center gap-1.5 rounded-md px-3 py-1.5 text-[13px] font-medium
-				{showTrash
-				? 'bg-slate-900 text-white dark:bg-white dark:text-slate-900'
-				: 'text-text-secondary hover:bg-black/5 dark:hover:bg-white/5'}"
-		>
-			<Trash2 size={14} strokeWidth={1.5} />
-			{m.lists_trash()}
-		</button>
-	</header>
+	<ScreenMasthead label={m.masthead_lists_label()} title={m.lists_title()}>
+		{#snippet actions()}
+			<button
+				onclick={toggleTrash}
+				class="flex items-center gap-1.5 rounded-md px-3 py-1.5 text-[13px] font-medium
+					{showTrash
+					? 'bg-slate-900 text-white dark:bg-white dark:text-slate-900'
+					: 'text-text-secondary hover:bg-black/5 dark:hover:bg-white/5'}"
+			>
+				<Trash2 size={14} strokeWidth={1.5} />
+				{m.lists_trash()}
+			</button>
+		{/snippet}
+	</ScreenMasthead>
 
 	<!-- Content -->
-	<div class="flex-1 overflow-y-auto px-8 pb-24">
+	<div class="flex-1 overflow-y-auto px-4 pb-24 md:px-6 md:pb-28">
 		{#if showTrash}
 			<!-- Trash view -->
 			<div class="mb-6">
@@ -269,9 +263,9 @@
 				</div>
 			{/if}
 
-			<!-- 2-column grid of remaining active lists -->
+			<!-- Grid of remaining active lists (2 col mobile, 3 col md+) -->
 			{#if gridLists.length > 0}
-				<div class="mb-4 grid grid-cols-2 gap-3">
+				<div class="mb-4 grid grid-cols-2 gap-3 md:grid-cols-3">
 					{#each gridLists as list (list.id)}
 						<div class="relative">
 							<a
@@ -395,10 +389,10 @@
 		{/if}
 	</div>
 
-	<!-- Sticky bottom: create new list -->
+	<!-- Sticky bottom: create new list (offset for the mobile bottom tab bar on small screens) -->
 	<div
-		class="absolute bottom-0 left-56 right-0 flex items-center gap-3 px-8 py-4
-			bg-background/80 backdrop-blur-[12px]"
+		class="absolute inset-x-0 bottom-0 flex items-center gap-3 px-4 py-4 bg-background/80 backdrop-blur-[12px] md:left-56 md:right-0 md:px-8
+			mb-16 md:mb-0"
 	>
 		<div class="flex flex-1 items-center gap-2 rounded-lg bg-surface px-4 py-2.5
 			shadow-[0px_2px_8px_rgba(15,23,42,0.06)]">

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

@@ -21,6 +21,7 @@
 		type RealtimeSubscription
 	} from '$lib/stores/realtimeSync';
 	import { enqueueOp, hydrateSyncState } from '$lib/sync';
+	import { scheduleUndoable } from '$lib/sync/undoQueue';
 	import SyncBanner from '$lib/components/SyncBanner.svelte';
 	import { getSupabase } from '$lib/supabase';
 	import type { ShoppingItem, ShoppingList } from '@colectivo/types';
@@ -67,8 +68,14 @@
 	let swipeStartX = 0;
 	let swipeStartY = 0;
 	let swipeHorizontal = false;
-	const SWIPE_MAX = 72;
+	// Red zone peek — width revealed when resting in "open" state.
+	const SWIPE_MAX = 96;
+	// Drag distance required to latch the red zone open (instead of snapping back).
 	const SWIPE_THRESHOLD = 48;
+	// Drag distance (negative, i.e. leftward) past which a full-swipe commit fires.
+	// Mobile cards are ~375px wide; 200px ≈ "more than half" which matches the
+	// iOS-style commit gesture the mockups imply.
+	const SWIPE_COMMIT_THRESHOLD = 200;
 
 	// List action menu
 	let showMenu = $state(false);
@@ -291,10 +298,23 @@
 	// ── Delete ─────────────────────────────────────────────────────────────────
 
 	async function handleDelete(id: string) {
+		const item = items.find((i) => i.id === id);
+		if (!item) return;
+		// Optimistic local removal; undoQueue decides whether to persist.
 		swipeOffsets[id] = 0;
 		openSwipeId = null;
+		const snapshot = { ...item };
 		items = items.filter((i) => i.id !== id);
-		await deleteItem(id);
+		scheduleUndoable({
+			label: m.undo_deleted_item({ name: snapshot.name }),
+			restore: () => {
+				// Re-insert at original sort order (stable-ish against concurrent inserts).
+				items = [...items, snapshot].sort((a, b) => a.sort_order - b.sort_order);
+			},
+			commit: async () => {
+				await deleteItem(id);
+			}
+		});
 	}
 
 	// ── Swipe to reveal delete (touch) ─────────────────────────────────────────
@@ -322,7 +342,9 @@
 			swipeHorizontal = true;
 		}
 
-		swipeOffsets[id] = Math.max(-SWIPE_MAX, Math.min(0, dx));
+		// Allow dragging past SWIPE_MAX (with rubber-banding feel) so the user
+		// can commit a full-swipe delete.
+		swipeOffsets[id] = Math.min(0, dx);
 	}
 
 	function onSwipeEnd(e: PointerEvent, id: string) {
@@ -330,7 +352,10 @@
 		if (!swipeHorizontal) return;
 
 		const offset = swipeOffsets[id] ?? 0;
-		if (offset <= -SWIPE_THRESHOLD) {
+		if (offset <= -SWIPE_COMMIT_THRESHOLD) {
+			// Full-swipe commit → delete with undo toast.
+			void handleDelete(id);
+		} else if (offset <= -SWIPE_THRESHOLD) {
 			swipeOffsets[id] = -SWIPE_MAX;
 			openSwipeId = id;
 		} else {
@@ -455,7 +480,7 @@
 									<button
 										onclick={() => handleDelete(item.id)}
 										class="flex h-full w-full items-center justify-center text-white"
-										aria-label={m.action_delete()}
+										aria-label={m.list_item_delete_aria()}
 									>
 										<Trash2 size={18} strokeWidth={1.5} />
 									</button>

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

@@ -5,6 +5,7 @@
 	import { notes, notesLoading, loadNotes, createNote } from '$lib/stores/notes';
 	import { FileText, Plus, Archive, Trash2 } from 'lucide-svelte';
 	import * as m from '$lib/paraglide/messages';
+	import ScreenMasthead from '$lib/components/ScreenMasthead.svelte';
 
 	$effect(() => {
 		if ($currentCollective) loadNotes($currentCollective.id);
@@ -55,37 +56,36 @@
 <svelte:head><title>{m.notes_title()} — Colectivo</title></svelte:head>
 
 <div class="flex h-full flex-col overflow-hidden">
-	<header class="flex h-14 items-center gap-2 border-b border-black/5 px-6 dark:border-white/5">
-		<FileText size={18} strokeWidth={1.5} />
-		<h1 class="text-base font-semibold text-text-primary">{m.notes_title()}</h1>
-		<div class="flex-1"></div>
-		<a
-			href="/notes/archive"
-			class="rounded p-1.5 text-text-secondary hover:bg-black/5 dark:hover:bg-white/5"
-			aria-label={m.notes_archive_view()}
-			title={m.notes_archive_view()}
-		>
-			<Archive size={16} strokeWidth={1.5} />
-		</a>
-		<a
-			href="/notes/trash"
-			class="rounded p-1.5 text-text-secondary hover:bg-black/5 dark:hover:bg-white/5"
-			aria-label={m.notes_trash_view()}
-			title={m.notes_trash_view()}
-		>
-			<Trash2 size={16} strokeWidth={1.5} />
-		</a>
-		<button
-			type="button"
-			onclick={handleCreate}
-			class="ml-2 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 dark:bg-slate-100 dark:text-slate-900"
-		>
-			<Plus size={14} strokeWidth={2} />
-			{m.notes_new()}
-		</button>
-	</header>
+	<ScreenMasthead label={m.masthead_notes_label()} title={m.notes_title()}>
+		{#snippet actions()}
+			<a
+				href="/notes/archive"
+				class="rounded p-1.5 text-text-secondary hover:bg-black/5 dark:hover:bg-white/5"
+				aria-label={m.notes_archive_view()}
+				title={m.notes_archive_view()}
+			>
+				<Archive size={16} strokeWidth={1.5} />
+			</a>
+			<a
+				href="/notes/trash"
+				class="rounded p-1.5 text-text-secondary hover:bg-black/5 dark:hover:bg-white/5"
+				aria-label={m.notes_trash_view()}
+				title={m.notes_trash_view()}
+			>
+				<Trash2 size={16} strokeWidth={1.5} />
+			</a>
+			<button
+				type="button"
+				onclick={handleCreate}
+				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 dark:bg-slate-100 dark:text-slate-900"
+			>
+				<Plus size={14} strokeWidth={2} />
+				{m.notes_new()}
+			</button>
+		{/snippet}
+	</ScreenMasthead>
 
-	<div class="flex-1 overflow-y-auto px-6 py-6">
+	<div class="flex-1 overflow-y-auto px-4 py-4 md:px-6 md:py-6">
 		{#if $notesLoading && $notes.length === 0}
 			<p class="text-sm text-text-secondary">{m.loading()}</p>
 		{:else if $notes.length === 0}

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

@@ -3,6 +3,7 @@
 	import { runSearch, type SearchRow, type SearchResultType } from '$lib/stores/search';
 	import { Search, FileText, CheckSquare, ShoppingCart } from 'lucide-svelte';
 	import * as m from '$lib/paraglide/messages';
+	import ScreenMasthead from '$lib/components/ScreenMasthead.svelte';
 
 	let query = $state('');
 	let results = $state<SearchRow[]>([]);
@@ -61,12 +62,9 @@
 <svelte:head><title>{m.search_title()} — Colectivo</title></svelte:head>
 
 <div class="flex h-full flex-col overflow-hidden">
-	<header class="flex flex-col gap-3 border-b border-black/5 px-6 py-4 dark:border-white/5">
-		<div class="flex items-center gap-2">
-			<Search size={18} strokeWidth={1.5} />
-			<h1 class="text-base font-semibold text-text-primary">{m.search_title()}</h1>
-		</div>
+	<ScreenMasthead label={m.masthead_search_label()} title={m.masthead_search_title()} />
 
+	<div class="flex flex-col gap-3 px-4 pb-3 md:px-6">
 		<div class="relative">
 			<Search size={14} strokeWidth={1.5} class="pointer-events-none absolute left-3 top-1/2 -translate-y-1/2 text-text-secondary" />
 			<input
@@ -115,9 +113,9 @@
 				{m.search_filter_notes()}
 			</button>
 		</div>
-	</header>
+	</div>
 
-	<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">
 		{#if query.trim().length < 2}
 			<p class="text-sm text-text-secondary">{m.search_hint()}</p>
 		{:else if loading}
@@ -130,6 +128,9 @@
 					<h2 class="mb-2 flex items-center gap-1.5 text-xs font-semibold uppercase tracking-wide text-text-secondary">
 						<ShoppingCart size={12} strokeWidth={1.5} />
 						{m.search_group_shopping_items()}
+						<span class="ml-auto rounded-full bg-slate-200 px-2 py-0.5 text-[10px] font-semibold text-slate-700 dark:bg-slate-800 dark:text-slate-300">
+							{grouped.shopping_item.length} {grouped.shopping_item.length === 1 ? 'MATCH' : 'MATCHES'}
+						</span>
 					</h2>
 					<div class="space-y-1">
 						{#each grouped.shopping_item as r (r.id)}
@@ -153,6 +154,9 @@
 					<h2 class="mb-2 flex items-center gap-1.5 text-xs font-semibold uppercase tracking-wide text-text-secondary">
 						<CheckSquare size={12} strokeWidth={1.5} />
 						{m.search_group_tasks()}
+						<span class="ml-auto rounded-full bg-slate-200 px-2 py-0.5 text-[10px] font-semibold text-slate-700 dark:bg-slate-800 dark:text-slate-300">
+							{grouped.task.length} {grouped.task.length === 1 ? 'MATCH' : 'MATCHES'}
+						</span>
 					</h2>
 					<div class="space-y-1">
 						{#each grouped.task as r (r.id)}
@@ -173,6 +177,9 @@
 					<h2 class="mb-2 flex items-center gap-1.5 text-xs font-semibold uppercase tracking-wide text-text-secondary">
 						<FileText size={12} strokeWidth={1.5} />
 						{m.search_group_notes()}
+						<span class="ml-auto rounded-full bg-slate-200 px-2 py-0.5 text-[10px] font-semibold text-slate-700 dark:bg-slate-800 dark:text-slate-300">
+							{grouped.note.length} {grouped.note.length === 1 ? 'MATCH' : 'MATCHES'}
+						</span>
 					</h2>
 					<div class="space-y-1">
 						{#each grouped.note as r (r.id)}

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

@@ -10,6 +10,7 @@
 	} from '$lib/stores/tasks';
 	import { CheckSquare, Plus, Trash2 } from 'lucide-svelte';
 	import * as m from '$lib/paraglide/messages';
+	import ScreenMasthead from '$lib/components/ScreenMasthead.svelte';
 
 	let newName = $state('');
 	let creating = $state(false);
@@ -53,12 +54,9 @@
 <svelte:head><title>{m.tasks_title()} — Colectivo</title></svelte:head>
 
 <div class="flex h-full flex-col overflow-hidden">
-	<header class="flex h-14 items-center gap-2 border-b border-black/5 px-6 dark:border-white/5">
-		<CheckSquare size={18} strokeWidth={1.5} />
-		<h1 class="text-base font-semibold text-text-primary">{m.tasks_title()}</h1>
-	</header>
+	<ScreenMasthead label={m.masthead_tasks_label()} title={m.tasks_title()} />
 
-	<div class="flex-1 overflow-y-auto px-6 py-6">
+	<div class="flex-1 overflow-y-auto px-4 py-4 md:px-6 md:py-6">
 		{#if $taskListsLoading && $taskLists.length === 0}
 			<p class="text-sm text-text-secondary">{m.loading()}</p>
 		{:else if $taskLists.length === 0}