feat(todo): complete animation + "Heute erledigt" section on focus pages

KanbanTaskCard:
- Checkbox click animates first (checkPop 300ms, fade to 50% opacity)
- After 500ms the actual onToggleComplete fires and task moves
- Modal cannot open during animation (pointer-events: none)

FokusLayout:
- Derives completedToday from tasks context (isCompleted + completedAt today)
- Shows "Heute erledigt" section at bottom of every sheet
- New items slide in from above (slideDown 350ms animation)

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

apps/todo/apps/web/src/lib/components/board-views/FokusLayout.svelte

@@ -1,5 +1,7 @@
 <script lang="ts">
 	import { dndzone, SHADOW_PLACEHOLDER_ITEM_ID, type DndEvent } from 'svelte-dnd-action';
+	import { getContext } from 'svelte';
+	import { isToday } from 'date-fns';
 	import type { Task } from '@todo/shared';
 	import type { GroupedColumn } from '$lib/data/view-grouping';
 	import KanbanTaskCard from '../kanban/KanbanTaskCard.svelte';
@@ -34,6 +36,12 @@
 		onAddColumn,
 	}: Props = $props();
 
+	// Today's completed tasks — shown at the bottom of every sheet
+	const tasksCtx: { readonly value: Task[] } = getContext('tasks');
+	let completedToday = $derived(
+		tasksCtx.value.filter((t) => t.isCompleted && t.completedAt && isToday(new Date(t.completedAt)))
+	);
+
 	const PAGE_WIDTH_MAP: Record<string, string> = {
 		narrow: 'min(360px, 85vw)',
 		medium: 'min(480px, 85vw)',
@@ -161,6 +169,22 @@
 				<div class="sheet-footer">
 					<QuickAddTaskInline onAdd={(title) => handleAddTask(column, title)} />
 				</div>
+
+				{#if completedToday.length > 0}
+					<div class="completed-today">
+						<div class="completed-today-label">Heute erledigt</div>
+						{#each completedToday as task (task.id)}
+							<div class="completed-today-item">
+								<KanbanTaskCard
+									{task}
+									onToggleComplete={() => onTaskToggle(task)}
+									onSave={(data) => onTaskUpdate(task.id, data)}
+									onDelete={() => onTaskDelete(task.id)}
+								/>
+							</div>
+						{/each}
+					</div>
+				{/if}
 			</div>
 		{/each}
 
@@ -309,6 +333,42 @@
 		color: #8b5cf6;
 	}
 
+	/* Heute erledigt section */
+	.completed-today {
+		padding: 0.75rem 1rem 1rem;
+		border-top: 1px solid rgba(0, 0, 0, 0.08);
+		margin-top: 0.25rem;
+	}
+	:global(.dark) .completed-today {
+		border-top-color: rgba(255, 255, 255, 0.08);
+	}
+	.completed-today-label {
+		font-size: 0.6875rem;
+		font-weight: 600;
+		text-transform: uppercase;
+		letter-spacing: 0.08em;
+		color: rgba(0, 0, 0, 0.3);
+		margin-bottom: 0.5rem;
+	}
+	:global(.dark) .completed-today-label {
+		color: rgba(255, 255, 255, 0.3);
+	}
+
+	@keyframes slideDown {
+		from {
+			opacity: 0;
+			transform: translateY(-10px);
+		}
+		to {
+			opacity: 1;
+			transform: translateY(0);
+		}
+	}
+
+	.completed-today-item {
+		animation: slideDown 0.35s ease-out both;
+	}
+
 	/* Page dots */
 	.page-dots {
 		display: flex;

apps/todo/apps/web/src/lib/components/kanban/KanbanTaskCard.svelte

@@ -28,6 +28,9 @@
 	let showModal = $state(false);
 	let showDeleteConfirm = $state(false);
 
+	// Completion animation
+	let isAnimatingComplete = $state(false);
+
 	// Inline edit state
 	let isEditingTitle = $state(false);
 	let editTitle = $state('');
@@ -58,13 +61,27 @@
 
 	// Click to open modal
 	function handleCardClick(e: MouseEvent) {
-		// Don't open modal if clicking on checkbox or during inline edit
-		if (isEditingTitle) return;
+		// Don't open modal if clicking on checkbox or during inline edit or animation
+		if (isEditingTitle || isAnimatingComplete) return;
 		const target = e.target as HTMLElement;
 		if (target.closest('.task-checkbox')) return;
 		showModal = true;
 	}
 
+	function handleCheckboxClick(e: MouseEvent) {
+		e.stopPropagation();
+		if (task.isCompleted) {
+			onToggleComplete?.();
+			return;
+		}
+		if (isAnimatingComplete) return;
+		isAnimatingComplete = true;
+		setTimeout(() => {
+			isAnimatingComplete = false;
+			onToggleComplete?.();
+		}, 500);
+	}
+
 	// Double-click to edit title inline
 	function handleTitleDoubleClick(e: MouseEvent) {
 		e.stopPropagation();
@@ -172,6 +189,7 @@
 <div
 	class="kanban-card group"
 	class:completed={task.isCompleted}
+	class:completing={isAnimatingComplete}
 	onclick={handleCardClick}
 	oncontextmenu={handleContextMenu}
 	role="button"
@@ -182,8 +200,12 @@
 
 	<!-- Checkbox -->
 	{#if onToggleComplete}
-		<button class="task-checkbox" class:checked={task.isCompleted} onclick={onToggleComplete}>
-			{#if task.isCompleted}
+		<button
+			class="task-checkbox"
+			class:checked={task.isCompleted || isAnimatingComplete}
+			onclick={handleCheckboxClick}
+		>
+			{#if task.isCompleted || isAnimatingComplete}
 				<Check size={20} class="check-icon" />
 			{/if}
 		</button>
@@ -203,7 +225,7 @@
 		{:else}
 			<span
 				class="task-title"
-				class:line-through={task.isCompleted}
+				class:line-through={task.isCompleted || isAnimatingComplete}
 				ondblclick={handleTitleDoubleClick}
 			>
 				{task.title}
@@ -363,6 +385,30 @@
 		opacity: 0.45;
 	}
 
+	.kanban-card.completing {
+		opacity: 0.5;
+		pointer-events: none;
+		transition: opacity 0.4s ease;
+	}
+
+	@keyframes checkPop {
+		0% {
+			transform: scale(0.5);
+			opacity: 0;
+		}
+		60% {
+			transform: scale(1.25);
+		}
+		100% {
+			transform: scale(1);
+			opacity: 1;
+		}
+	}
+
+	.task-checkbox.checked {
+		animation: checkPop 0.3s ease-out;
+	}
+
 	/* Priority dot — slim left accent, aligned to first line */
 	.priority-dot {
 		width: 3px;