refactor(todo): extract shared useTaskForm composable

Extract 16 duplicated $state declarations, form initialization logic,
and save/buildUpdateInput from TaskItem and TaskEditModal into a shared
useTaskForm.svelte.ts composable. Uses getter/setter pattern for
Svelte 5 bind:value compatibility.

Eliminates ~200 lines of duplicated form state management.

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

apps/todo/apps/web/src/lib/components/TaskEditModal.svelte

@@ -1,13 +1,5 @@
 <script lang="ts">
-	import type {
-		Task,
-		Subtask,
-		TaskPriority,
-		TaskStatus,
-		EffectiveDuration,
-		UpdateTaskInput,
-	} from '@todo/shared';
-	import type { ContactReference, ContactOrManual } from '@manacore/shared-types';
+	import type { Task, Subtask, UpdateTaskInput } from '@todo/shared';
 	import { STATUS_OPTIONS, RECURRENCE_OPTIONS } from '@todo/shared';
 	import { getContext } from 'svelte';
 	import type { Project } from '@todo/shared';
@@ -15,7 +7,7 @@
 
 	const projectsCtx: { readonly value: Project[] } = getContext('projects');
 	import { contactsStore } from '$lib/stores/contacts.svelte';
-	import { format } from 'date-fns';
+	import { useTaskForm } from '$lib/composables/useTaskForm.svelte';
 	import SubtaskList from './SubtaskList.svelte';
 	import {
 		PrioritySelector,
@@ -39,61 +31,15 @@
 
 	let { task, open, onClose, onSave, onDelete }: Props = $props();
 
-	// Form state - initialized from task
-	let title = $state('');
-	let description = $state('');
-	let dueDate = $state('');
-	let dueTime = $state('');
-	let startDate = $state('');
-	let priority = $state<TaskPriority>('medium');
-	let status = $state<TaskStatus>('pending');
-	let projectId = $state<string | null>(null);
-	let selectedLabelIds = $state<string[]>([]);
-	let subtasks = $state<Subtask[]>([]);
-	let recurrenceRule = $state('');
-	let notes = $state('');
-	let storyPoints = $state<number | null>(null);
-	let effectiveDuration = $state<EffectiveDuration | null>(null);
-	let funRating = $state<number | null>(null);
+	const form = useTaskForm();
+
 	// Link picker state
 	let showLinkPicker = $state(false);
-	// Contact associations
-	let assignee = $state<ContactOrManual[]>([]);
-	let involvedContacts = $state<ContactOrManual[]>([]);
-	let contactsAvailable = $state<boolean | null>(null);
-
-	// UI state
-	let isLoading = $state(false);
-	let showDeleteConfirm = $state(false);
 
 	// Initialize form when task changes or modal opens
 	$effect(() => {
 		if (open && task) {
-			title = task.title || '';
-			description = task.description || '';
-			dueDate = task.dueDate ? format(new Date(task.dueDate), 'yyyy-MM-dd') : '';
-			dueTime = task.dueTime || '';
-			startDate = task.startDate ? format(new Date(task.startDate), 'yyyy-MM-dd') : '';
-			priority = task.priority || 'medium';
-			status = task.status || 'pending';
-			projectId = task.projectId || null;
-			selectedLabelIds = task.labels?.map((l) => l.id) || [];
-			subtasks = task.subtasks ? [...task.subtasks] : [];
-			recurrenceRule = task.recurrenceRule || '';
-			notes = task.metadata?.notes || '';
-			// Metadata fields
-			storyPoints = task.metadata?.storyPoints ?? null;
-			effectiveDuration = task.metadata?.effectiveDuration ?? null;
-			funRating = task.metadata?.funRating ?? null;
-			// Contact associations
-			assignee = task.metadata?.assignee ? [task.metadata.assignee] : [];
-			involvedContacts = task.metadata?.involvedContacts || [];
-			showDeleteConfirm = false;
-
-			// Check contacts availability
-			contactsStore.checkAvailability().then((available) => {
-				contactsAvailable = available;
-			});
+			form.initFromTask(task);
 		}
 	});
 
@@ -112,65 +58,27 @@
 		}
 	}
 
-	// Extract ContactReference from ContactOrManual (filter out manual entries for now)
-	function toContactReference(contact: ContactOrManual): ContactReference | null {
-		if ('isManual' in contact && contact.isManual) {
-			return null; // Manual entries not stored as contacts
-		}
-		return contact as ContactReference;
-	}
-
 	async function handleSave() {
-		if (!title.trim()) return;
+		if (!form.title.trim()) return;
 
-		isLoading = true;
+		form.isLoading = true;
 		try {
-			// Convert assignee array to single ContactReference
-			const assigneeRef = assignee.length > 0 ? toContactReference(assignee[0]) : null;
-			// Convert involved contacts to array of ContactReferences
-			const involvedRefs = involvedContacts
-				.map(toContactReference)
-				.filter((c): c is ContactReference => c !== null);
-
-			const data: UpdateTaskInput = {
-				title: title.trim(),
-				description: description.trim() || null,
-				dueDate: dueDate ? new Date(dueDate).toISOString() : null,
-				dueTime: dueTime || null,
-				startDate: startDate ? new Date(startDate).toISOString() : null,
-				priority,
-				status,
-				projectId: projectId || null,
-				subtasks: subtasks.length > 0 ? subtasks : null,
-				recurrenceRule: recurrenceRule || null,
-				metadata: {
-					...task.metadata,
-					notes: notes.trim() || undefined,
-					storyPoints: storyPoints ?? undefined,
-					effectiveDuration: effectiveDuration ?? undefined,
-					funRating: funRating ?? undefined,
-					assignee: assigneeRef ?? undefined,
-					involvedContacts: involvedRefs.length > 0 ? involvedRefs : undefined,
-				},
-				labelIds: selectedLabelIds,
-			};
-
-			onSave(data);
+			onSave(form.buildUpdateInput(task));
 		} finally {
-			isLoading = false;
+			form.isLoading = false;
 		}
 	}
 
 	function handleDelete() {
-		if (showDeleteConfirm) {
+		if (form.showDeleteConfirm) {
 			onDelete(task.id);
 		} else {
-			showDeleteConfirm = true;
+			form.showDeleteConfirm = true;
 		}
 	}
 
 	function handleSubtasksChange(newSubtasks: Subtask[]) {
-		subtasks = newSubtasks;
+		form.subtasks = newSubtasks;
 	}
 </script>
 
@@ -202,7 +110,7 @@
 						id="task-title"
 						type="text"
 						class="form-input"
-						bind:value={title}
+						bind:value={form.title}
 						placeholder="Aufgabentitel..."
 					/>
 				</div>
@@ -213,7 +121,7 @@
 					<textarea
 						id="task-description"
 						class="form-textarea"
-						bind:value={description}
+						bind:value={form.description}
 						placeholder="Beschreibung hinzufügen..."
 						rows="3"
 					></textarea>
@@ -223,15 +131,15 @@
 				<div class="form-section">
 					<label class="form-label">Zuständig</label>
 					<ContactSelector
-						selectedContacts={assignee}
-						onContactsChange={(contacts) => (assignee = contacts)}
+						selectedContacts={form.assignee}
+						onContactsChange={(contacts) => (form.assignee = contacts)}
 						onSearch={(q) => contactsStore.searchContacts(q)}
 						singleSelect={true}
 						allowManualEntry={false}
 						placeholder="Person zuweisen..."
 						addLabel="Zuweisen"
 						searchPlaceholder="Name oder E-Mail..."
-						isAvailable={contactsAvailable ?? false}
+						isAvailable={form.contactsAvailable ?? false}
 					/>
 				</div>
 
@@ -239,14 +147,14 @@
 				<div class="form-section">
 					<label class="form-label">Beteiligte</label>
 					<ContactSelector
-						selectedContacts={involvedContacts}
-						onContactsChange={(contacts) => (involvedContacts = contacts)}
+						selectedContacts={form.involvedContacts}
+						onContactsChange={(contacts) => (form.involvedContacts = contacts)}
 						onSearch={(q) => contactsStore.searchContacts(q)}
 						allowManualEntry={false}
 						placeholder="Personen hinzufügen..."
 						addLabel="Person hinzufügen"
 						searchPlaceholder="Name oder E-Mail..."
-						isAvailable={contactsAvailable ?? false}
+						isAvailable={form.contactsAvailable ?? false}
 					/>
 				</div>
 
@@ -256,15 +164,20 @@
 					<div class="form-row">
 						<div class="form-field">
 							<label class="form-sublabel" for="due-date">Fälligkeitsdatum</label>
-							<input id="due-date" type="date" class="form-input-sm" bind:value={dueDate} />
+							<input id="due-date" type="date" class="form-input-sm" bind:value={form.dueDate} />
 						</div>
 						<div class="form-field">
 							<label class="form-sublabel" for="due-time">Uhrzeit</label>
-							<input id="due-time" type="time" class="form-input-sm" bind:value={dueTime} />
+							<input id="due-time" type="time" class="form-input-sm" bind:value={form.dueTime} />
 						</div>
 						<div class="form-field">
 							<label class="form-sublabel" for="start-date">Startdatum</label>
-							<input id="start-date" type="date" class="form-input-sm" bind:value={startDate} />
+							<input
+								id="start-date"
+								type="date"
+								class="form-input-sm"
+								bind:value={form.startDate}
+							/>
 						</div>
 					</div>
 				</div>
@@ -272,13 +185,13 @@
 				<!-- Priorität -->
 				<div class="form-section">
 					<label class="form-label">Priorität</label>
-					<PrioritySelector value={priority} onChange={(p) => (priority = p)} />
+					<PrioritySelector value={form.priority} onChange={(p) => (form.priority = p)} />
 				</div>
 
 				<!-- Status -->
 				<div class="form-section">
 					<label class="form-label" for="task-status">Status</label>
-					<select id="task-status" class="form-select" bind:value={status}>
+					<select id="task-status" class="form-select" bind:value={form.status}>
 						{#each STATUS_OPTIONS as s}
 							<option value={s.value}>{s.label}</option>
 						{/each}
@@ -288,7 +201,7 @@
 				<!-- Projekt -->
 				<div class="form-section">
 					<label class="form-label" for="task-project">Projekt</label>
-					<select id="task-project" class="form-select" bind:value={projectId}>
+					<select id="task-project" class="form-select" bind:value={form.projectId}>
 						<option value={null}>Kein Projekt</option>
 						{#each getActiveProjects(projectsCtx.value) as project}
 							<option value={project.id}>
@@ -302,15 +215,15 @@
 				<div class="form-section">
 					<label class="form-label">Tags</label>
 					<TagSelector
-						selectedIds={selectedLabelIds}
-						onChange={(ids) => (selectedLabelIds = ids)}
+						selectedIds={form.selectedLabelIds}
+						onChange={(ids) => (form.selectedLabelIds = ids)}
 					/>
 				</div>
 
 				<!-- Subtasks -->
 				<div class="form-section">
 					<label class="form-label">Subtasks</label>
-					<SubtaskList {subtasks} onChange={handleSubtasksChange} />
+					<SubtaskList subtasks={form.subtasks} onChange={handleSubtasksChange} />
 				</div>
 
 				<!-- Verknüpfungen -->
@@ -330,7 +243,7 @@
 
 				<ManaLinkPicker
 					sourceRef={{ app: 'todo', collection: 'tasks', id: task.id }}
-					sourceTitle={title || task.title}
+					sourceTitle={form.title || task.title}
 					open={showLinkPicker}
 					onClose={() => (showLinkPicker = false)}
 					onSearch={searchCrossApp}
@@ -339,7 +252,7 @@
 				<!-- Wiederholung -->
 				<div class="form-section">
 					<label class="form-label" for="task-recurrence">Wiederholung</label>
-					<select id="task-recurrence" class="form-select" bind:value={recurrenceRule}>
+					<select id="task-recurrence" class="form-select" bind:value={form.recurrenceRule}>
 						{#each RECURRENCE_OPTIONS as option}
 							<option value={option.value}>{option.label}</option>
 						{/each}
@@ -352,7 +265,7 @@
 					<textarea
 						id="task-notes"
 						class="form-textarea"
-						bind:value={notes}
+						bind:value={form.notes}
 						placeholder="Zusätzliche Notizen..."
 						rows="3"
 					></textarea>
@@ -361,41 +274,55 @@
 				<!-- Storypoints -->
 				<div class="form-section">
 					<label class="form-label">Storypoints</label>
-					<StorypointsSelector value={storyPoints} onChange={(v) => (storyPoints = v)} />
+					<StorypointsSelector value={form.storyPoints} onChange={(v) => (form.storyPoints = v)} />
 				</div>
 
 				<!-- Effektive Dauer -->
 				<div class="form-section">
 					<label class="form-label">Effektive Dauer</label>
-					<DurationPicker value={effectiveDuration} onChange={(v) => (effectiveDuration = v)} />
+					<DurationPicker
+						value={form.effectiveDuration}
+						onChange={(v) => (form.effectiveDuration = v)}
+					/>
 				</div>
 
 				<!-- Spaß-Faktor -->
 				<div class="form-section">
 					<label class="form-label">
-						Spaß-Faktor{#if funRating !== null}: <span class="fun-rating-value">{funRating}</span
+						Spaß-Faktor{#if form.funRating !== null}: <span class="fun-rating-value"
+								>{form.funRating}</span
 							>{/if}
 					</label>
-					<FunRatingPicker value={funRating} onChange={(v) => (funRating = v)} />
+					<FunRatingPicker value={form.funRating} onChange={(v) => (form.funRating = v)} />
 				</div>
 			</div>
 
 			<!-- Footer -->
 			<div class="modal-footer">
-				<button type="button" class="btn btn-danger" onclick={handleDelete} disabled={isLoading}>
-					{showDeleteConfirm ? 'Wirklich löschen?' : 'Löschen'}
+				<button
+					type="button"
+					class="btn btn-danger"
+					onclick={handleDelete}
+					disabled={form.isLoading}
+				>
+					{form.showDeleteConfirm ? 'Wirklich löschen?' : 'Löschen'}
 				</button>
 				<div class="footer-right">
-					<button type="button" class="btn btn-secondary" onclick={onClose} disabled={isLoading}>
+					<button
+						type="button"
+						class="btn btn-secondary"
+						onclick={onClose}
+						disabled={form.isLoading}
+					>
 						Abbrechen
 					</button>
 					<button
 						type="button"
 						class="btn btn-primary"
 						onclick={handleSave}
-						disabled={isLoading || !title.trim()}
+						disabled={form.isLoading || !form.title.trim()}
 					>
-						{#if isLoading}
+						{#if form.isLoading}
 							<div class="spinner"></div>
 						{:else}
 							Speichern

apps/todo/apps/web/src/lib/components/TaskItem.svelte

@@ -1,18 +1,11 @@
 <script lang="ts">
-	import type {
-		Task,
-		Subtask,
-		TaskPriority,
-		TaskStatus,
-		EffectiveDuration,
-		UpdateTaskInput,
-	} from '@todo/shared';
-	import type { ContactReference, ContactOrManual } from '@manacore/shared-types';
+	import type { Task, Subtask, UpdateTaskInput } from '@todo/shared';
 	import { STATUS_OPTIONS, RECURRENCE_OPTIONS } from '@todo/shared';
 	import { format, isToday, isPast } from 'date-fns';
 	import { de } from 'date-fns/locale';
 	import { formatDueDate } from '$lib/utils/date-display';
 	import { getSubtaskProgress } from '$lib/utils/task-helpers';
+	import { useTaskForm } from '$lib/composables/useTaskForm.svelte';
 	import { getContext } from 'svelte';
 	import type { Project } from '@todo/shared';
 	import { getActiveProjects, getProjectColor } from '$lib/data/task-queries';
@@ -58,27 +51,9 @@
 	// Toggle for showing created date on completed tasks
 	let showCreatedDate = $state(false);
 
-	// Form state for expanded mode
-	let title = $state('');
-	let description = $state('');
-	let dueDate = $state('');
-	let dueTime = $state('');
-	let startDate = $state('');
-	let priority = $state<TaskPriority>('medium');
-	let status = $state<TaskStatus>('pending');
-	let projectId = $state<string | null>(null);
-	let selectedLabelIds = $state<string[]>([]);
-	let subtasks = $state<Subtask[]>([]);
-	let recurrenceRule = $state('');
-	let notes = $state('');
-	let storyPoints = $state<number | null>(null);
-	let effectiveDuration = $state<EffectiveDuration | null>(null);
-	let funRating = $state<number | null>(null);
-	let assignee = $state<ContactOrManual[]>([]);
-	let involvedContacts = $state<ContactOrManual[]>([]);
-	let contactsAvailable = $state<boolean | null>(null);
-	let isLoading = $state(false);
-	let showDeleteConfirm = $state(false);
+	// Shared form state
+	const form = useTaskForm();
+
 	let titleInputRef = $state<HTMLInputElement | null>(null);
 	let autoSaveTimer: ReturnType<typeof setTimeout> | null = null;
 	let isInitializing = $state(false);
@@ -95,28 +70,7 @@
 	$effect(() => {
 		if (isExpanded && task) {
 			isInitializing = true;
-			title = task.title || '';
-			description = task.description || '';
-			dueDate = task.dueDate ? format(new Date(task.dueDate), 'yyyy-MM-dd') : '';
-			dueTime = task.dueTime || '';
-			startDate = task.startDate ? format(new Date(task.startDate), 'yyyy-MM-dd') : '';
-			priority = task.priority || 'medium';
-			status = task.status || 'pending';
-			projectId = task.projectId || null;
-			selectedLabelIds = task.labels?.map((l) => l.id) || [];
-			subtasks = task.subtasks ? [...task.subtasks] : [];
-			recurrenceRule = task.recurrenceRule || '';
-			notes = task.metadata?.notes || '';
-			storyPoints = task.metadata?.storyPoints ?? null;
-			effectiveDuration = task.metadata?.effectiveDuration ?? null;
-			funRating = task.metadata?.funRating ?? null;
-			assignee = task.metadata?.assignee ? [task.metadata.assignee] : [];
-			involvedContacts = task.metadata?.involvedContacts || [];
-			showDeleteConfirm = false;
-
-			contactsStore.checkAvailability().then((available) => {
-				contactsAvailable = available;
-			});
+			form.initFromTask(task);
 
 			// Allow a tick for all state to settle before enabling auto-save
 			setTimeout(() => {
@@ -138,23 +92,23 @@
 	$effect(() => {
 		// Read all reactive form fields to create dependencies
 		void [
-			title,
-			description,
-			dueDate,
-			dueTime,
-			startDate,
-			priority,
-			status,
-			projectId,
-			selectedLabelIds,
-			subtasks,
-			recurrenceRule,
-			notes,
-			storyPoints,
-			effectiveDuration,
-			funRating,
-			assignee,
-			involvedContacts,
+			form.title,
+			form.description,
+			form.dueDate,
+			form.dueTime,
+			form.startDate,
+			form.priority,
+			form.status,
+			form.projectId,
+			form.selectedLabelIds,
+			form.subtasks,
+			form.recurrenceRule,
+			form.notes,
+			form.storyPoints,
+			form.effectiveDuration,
+			form.funRating,
+			form.assignee,
+			form.involvedContacts,
 		];
 		scheduleAutoSave();
 	});
@@ -236,62 +190,28 @@
 		}
 	}
 
-	function toContactReference(contact: ContactOrManual): ContactReference | null {
-		if ('isManual' in contact && contact.isManual) {
-			return null;
-		}
-		return contact as ContactReference;
-	}
-
 	async function handleSave() {
-		if (!title.trim() || !onSave) return;
+		if (!form.title.trim() || !onSave) return;
 
-		isLoading = true;
+		form.isLoading = true;
 		try {
-			const assigneeRef = assignee.length > 0 ? toContactReference(assignee[0]) : null;
-			const involvedRefs = involvedContacts
-				.map(toContactReference)
-				.filter((c): c is ContactReference => c !== null);
-
-			const data: UpdateTaskInput = {
-				title: title.trim(),
-				description: description.trim() || null,
-				dueDate: dueDate ? new Date(dueDate).toISOString() : null,
-				dueTime: dueTime || null,
-				startDate: startDate ? new Date(startDate).toISOString() : null,
-				priority,
-				status,
-				projectId: projectId || null,
-				subtasks: subtasks.length > 0 ? subtasks : null,
-				recurrenceRule: recurrenceRule || null,
-				metadata: {
-					...task.metadata,
-					notes: notes.trim() || undefined,
-					storyPoints: storyPoints ?? undefined,
-					effectiveDuration: effectiveDuration ?? undefined,
-					funRating: funRating ?? undefined,
-					assignee: assigneeRef ?? undefined,
-					involvedContacts: involvedRefs.length > 0 ? involvedRefs : undefined,
-				},
-				labelIds: selectedLabelIds,
-			};
-
+			const data = form.buildUpdateInput(task);
 			onSave(data);
 		} finally {
-			isLoading = false;
+			form.isLoading = false;
 		}
 	}
 
 	function handleDeleteClick() {
-		if (showDeleteConfirm) {
+		if (form.showDeleteConfirm) {
 			onDelete();
 		} else {
-			showDeleteConfirm = true;
+			form.showDeleteConfirm = true;
 		}
 	}
 
 	function handleSubtasksChange(newSubtasks: Subtask[]) {
-		subtasks = newSubtasks;
+		form.subtasks = newSubtasks;
 	}
 
 	const priorityColors = PRIORITY_COLORS;
@@ -502,7 +422,7 @@
 					id="task-title-{task.id}"
 					type="text"
 					class="form-input"
-					bind:value={title}
+					bind:value={form.title}
 					placeholder="Aufgabentitel..."
 				/>
 			</div>
@@ -513,7 +433,7 @@
 				<textarea
 					id="task-description-{task.id}"
 					class="form-textarea"
-					bind:value={description}
+					bind:value={form.description}
 					placeholder="Beschreibung hinzufügen..."
 					rows="2"
 				></textarea>
@@ -525,11 +445,21 @@
 				<div class="form-row">
 					<div class="form-field">
 						<label class="form-sublabel" for="due-date-{task.id}">Fällig</label>
-						<input id="due-date-{task.id}" type="date" class="form-input-sm" bind:value={dueDate} />
+						<input
+							id="due-date-{task.id}"
+							type="date"
+							class="form-input-sm"
+							bind:value={form.dueDate}
+						/>
 					</div>
 					<div class="form-field">
 						<label class="form-sublabel" for="due-time-{task.id}">Uhrzeit</label>
-						<input id="due-time-{task.id}" type="time" class="form-input-sm" bind:value={dueTime} />
+						<input
+							id="due-time-{task.id}"
+							type="time"
+							class="form-input-sm"
+							bind:value={form.dueTime}
+						/>
 					</div>
 					<div class="form-field">
 						<label class="form-sublabel" for="start-date-{task.id}">Start</label>
@@ -537,7 +467,7 @@
 							id="start-date-{task.id}"
 							type="date"
 							class="form-input-sm"
-							bind:value={startDate}
+							bind:value={form.startDate}
 						/>
 					</div>
 				</div>
@@ -546,14 +476,14 @@
 			<!-- Priority -->
 			<div class="form-section">
 				<label class="form-label">Priorität</label>
-				<PrioritySelector value={priority} onChange={(p) => (priority = p)} />
+				<PrioritySelector value={form.priority} onChange={(p) => (form.priority = p)} />
 			</div>
 
 			<!-- Status & Project row -->
 			<div class="form-row-2">
 				<div class="form-section">
 					<label class="form-label" for="task-status-{task.id}">Status</label>
-					<select id="task-status-{task.id}" class="form-select" bind:value={status}>
+					<select id="task-status-{task.id}" class="form-select" bind:value={form.status}>
 						{#each STATUS_OPTIONS as s}
 							<option value={s.value}>{s.label}</option>
 						{/each}
@@ -561,7 +491,7 @@
 				</div>
 				<div class="form-section">
 					<label class="form-label" for="task-project-{task.id}">Projekt</label>
-					<select id="task-project-{task.id}" class="form-select" bind:value={projectId}>
+					<select id="task-project-{task.id}" class="form-select" bind:value={form.projectId}>
 						<option value={null}>Kein Projekt</option>
 						{#each getActiveProjects(projectsCtx.value) as project}
 							<option value={project.id}>{project.name}</option>
@@ -573,19 +503,22 @@
 			<!-- Tags -->
 			<div class="form-section">
 				<label class="form-label">Tags</label>
-				<TagSelector selectedIds={selectedLabelIds} onChange={(ids) => (selectedLabelIds = ids)} />
+				<TagSelector
+					selectedIds={form.selectedLabelIds}
+					onChange={(ids) => (form.selectedLabelIds = ids)}
+				/>
 			</div>
 
 			<!-- Subtasks -->
 			<div class="form-section">
 				<label class="form-label">Subtasks</label>
-				<SubtaskList {subtasks} onChange={handleSubtasksChange} />
+				<SubtaskList subtasks={form.subtasks} onChange={handleSubtasksChange} />
 			</div>
 
 			<!-- Recurrence -->
 			<div class="form-section">
 				<label class="form-label" for="task-recurrence-{task.id}">Wiederholung</label>
-				<select id="task-recurrence-{task.id}" class="form-select" bind:value={recurrenceRule}>
+				<select id="task-recurrence-{task.id}" class="form-select" bind:value={form.recurrenceRule}>
 					{#each RECURRENCE_OPTIONS as option}
 						<option value={option.value}>{option.label}</option>
 					{/each}
@@ -596,15 +529,15 @@
 			<div class="form-section">
 				<label class="form-label">Zuständig</label>
 				<ContactSelector
-					selectedContacts={assignee}
-					onContactsChange={(contacts) => (assignee = contacts)}
+					selectedContacts={form.assignee}
+					onContactsChange={(contacts) => (form.assignee = contacts)}
 					onSearch={(q) => contactsStore.searchContacts(q)}
 					singleSelect={true}
 					allowManualEntry={false}
 					placeholder="Person zuweisen..."
 					addLabel="Zuweisen"
 					searchPlaceholder="Name oder E-Mail..."
-					isAvailable={contactsAvailable ?? false}
+					isAvailable={form.contactsAvailable ?? false}
 				/>
 			</div>
 
@@ -612,14 +545,14 @@
 			<div class="form-section">
 				<label class="form-label">Beteiligte</label>
 				<ContactSelector
-					selectedContacts={involvedContacts}
-					onContactsChange={(contacts) => (involvedContacts = contacts)}
+					selectedContacts={form.involvedContacts}
+					onContactsChange={(contacts) => (form.involvedContacts = contacts)}
 					onSearch={(q) => contactsStore.searchContacts(q)}
 					allowManualEntry={false}
 					placeholder="Personen hinzufügen..."
 					addLabel="Person hinzufügen"
 					searchPlaceholder="Name oder E-Mail..."
-					isAvailable={contactsAvailable ?? false}
+					isAvailable={form.contactsAvailable ?? false}
 				/>
 			</div>
 
@@ -629,7 +562,7 @@
 				<textarea
 					id="task-notes-{task.id}"
 					class="form-textarea"
-					bind:value={notes}
+					bind:value={form.notes}
 					placeholder="Zusätzliche Notizen..."
 					rows="2"
 				></textarea>
@@ -639,15 +572,18 @@
 			<div class="form-row-3">
 				<div class="form-section">
 					<label class="form-label">Storypoints</label>
-					<StorypointsSelector value={storyPoints} onChange={(v) => (storyPoints = v)} />
+					<StorypointsSelector value={form.storyPoints} onChange={(v) => (form.storyPoints = v)} />
 				</div>
 				<div class="form-section">
 					<label class="form-label">Dauer</label>
-					<DurationPicker value={effectiveDuration} onChange={(v) => (effectiveDuration = v)} />
+					<DurationPicker
+						value={form.effectiveDuration}
+						onChange={(v) => (form.effectiveDuration = v)}
+					/>
 				</div>
 				<div class="form-section">
 					<label class="form-label">Spaß</label>
-					<FunRatingPicker value={funRating} onChange={(v) => (funRating = v)} />
+					<FunRatingPicker value={form.funRating} onChange={(v) => (form.funRating = v)} />
 				</div>
 			</div>
 
@@ -657,9 +593,9 @@
 					type="button"
 					class="btn btn-danger"
 					onclick={handleDeleteClick}
-					disabled={isLoading}
+					disabled={form.isLoading}
 				>
-					{showDeleteConfirm ? 'Wirklich löschen?' : 'Löschen'}
+					{form.showDeleteConfirm ? 'Wirklich löschen?' : 'Löschen'}
 				</button>
 			</div>
 		</div>

apps/todo/apps/web/src/lib/composables/useTaskForm.svelte.ts

@@ -0,0 +1,244 @@
+import type {
+	Task,
+	Subtask,
+	TaskPriority,
+	TaskStatus,
+	EffectiveDuration,
+	UpdateTaskInput,
+} from '@todo/shared';
+import type { ContactReference, ContactOrManual } from '@manacore/shared-types';
+import { format } from 'date-fns';
+import { contactsStore } from '$lib/stores/contacts.svelte';
+
+/**
+ * Shared composable for task form state and logic.
+ * Used by both TaskItem (inline edit) and TaskEditModal.
+ */
+export function useTaskForm() {
+	// Form state
+	let title = $state('');
+	let description = $state('');
+	let dueDate = $state('');
+	let dueTime = $state('');
+	let startDate = $state('');
+	let priority = $state<TaskPriority>('medium');
+	let status = $state<TaskStatus>('pending');
+	let projectId = $state<string | null>(null);
+	let selectedLabelIds = $state<string[]>([]);
+	let subtasks = $state<Subtask[]>([]);
+	let recurrenceRule = $state('');
+	let notes = $state('');
+	let storyPoints = $state<number | null>(null);
+	let effectiveDuration = $state<EffectiveDuration | null>(null);
+	let funRating = $state<number | null>(null);
+	let assignee = $state<ContactOrManual[]>([]);
+	let involvedContacts = $state<ContactOrManual[]>([]);
+
+	// UI state
+	let showDeleteConfirm = $state(false);
+	let isLoading = $state(false);
+	let contactsAvailable = $state<boolean | null>(null);
+
+	/**
+	 * Initialize all form fields from a Task object.
+	 * Call this when the task changes or the form becomes visible.
+	 */
+	function initFromTask(task: Task) {
+		title = task.title || '';
+		description = task.description || '';
+		dueDate = task.dueDate ? format(new Date(task.dueDate), 'yyyy-MM-dd') : '';
+		dueTime = task.dueTime || '';
+		startDate = task.startDate ? format(new Date(task.startDate), 'yyyy-MM-dd') : '';
+		priority = task.priority || 'medium';
+		status = task.status || 'pending';
+		projectId = task.projectId || null;
+		selectedLabelIds = task.labels?.map((l) => l.id) || [];
+		subtasks = task.subtasks ? [...task.subtasks] : [];
+		recurrenceRule = task.recurrenceRule || '';
+		notes = task.metadata?.notes || '';
+		storyPoints = task.metadata?.storyPoints ?? null;
+		effectiveDuration = task.metadata?.effectiveDuration ?? null;
+		funRating = task.metadata?.funRating ?? null;
+		assignee = task.metadata?.assignee ? [task.metadata.assignee] : [];
+		involvedContacts = task.metadata?.involvedContacts || [];
+		showDeleteConfirm = false;
+
+		// Check contacts availability
+		contactsStore.checkAvailability().then((available) => {
+			contactsAvailable = available;
+		});
+	}
+
+	/**
+	 * Extract ContactReference from ContactOrManual (filter out manual entries).
+	 */
+	function toContactReference(contact: ContactOrManual): ContactReference | null {
+		if ('isManual' in contact && contact.isManual) {
+			return null;
+		}
+		return contact as ContactReference;
+	}
+
+	/**
+	 * Build an UpdateTaskInput object from the current form state.
+	 * Requires the original task for metadata merging.
+	 */
+	function buildUpdateInput(task: Task): UpdateTaskInput {
+		const assigneeRef = assignee.length > 0 ? toContactReference(assignee[0]) : null;
+		const involvedRefs = involvedContacts
+			.map(toContactReference)
+			.filter((c): c is ContactReference => c !== null);
+
+		return {
+			title: title.trim(),
+			description: description.trim() || null,
+			dueDate: dueDate ? new Date(dueDate).toISOString() : null,
+			dueTime: dueTime || null,
+			startDate: startDate ? new Date(startDate).toISOString() : null,
+			priority,
+			status,
+			projectId: projectId || null,
+			subtasks: subtasks.length > 0 ? subtasks : null,
+			recurrenceRule: recurrenceRule || null,
+			metadata: {
+				...task.metadata,
+				notes: notes.trim() || undefined,
+				storyPoints: storyPoints ?? undefined,
+				effectiveDuration: effectiveDuration ?? undefined,
+				funRating: funRating ?? undefined,
+				assignee: assigneeRef ?? undefined,
+				involvedContacts: involvedRefs.length > 0 ? involvedRefs : undefined,
+			},
+			labelIds: selectedLabelIds,
+		};
+	}
+
+	return {
+		// State — exposed as getters/setters so bind:value works via form.title etc.
+		get title() {
+			return title;
+		},
+		set title(v: string) {
+			title = v;
+		},
+		get description() {
+			return description;
+		},
+		set description(v: string) {
+			description = v;
+		},
+		get dueDate() {
+			return dueDate;
+		},
+		set dueDate(v: string) {
+			dueDate = v;
+		},
+		get dueTime() {
+			return dueTime;
+		},
+		set dueTime(v: string) {
+			dueTime = v;
+		},
+		get startDate() {
+			return startDate;
+		},
+		set startDate(v: string) {
+			startDate = v;
+		},
+		get priority() {
+			return priority;
+		},
+		set priority(v: TaskPriority) {
+			priority = v;
+		},
+		get status() {
+			return status;
+		},
+		set status(v: TaskStatus) {
+			status = v;
+		},
+		get projectId() {
+			return projectId;
+		},
+		set projectId(v: string | null) {
+			projectId = v;
+		},
+		get selectedLabelIds() {
+			return selectedLabelIds;
+		},
+		set selectedLabelIds(v: string[]) {
+			selectedLabelIds = v;
+		},
+		get subtasks() {
+			return subtasks;
+		},
+		set subtasks(v: Subtask[]) {
+			subtasks = v;
+		},
+		get recurrenceRule() {
+			return recurrenceRule;
+		},
+		set recurrenceRule(v: string) {
+			recurrenceRule = v;
+		},
+		get notes() {
+			return notes;
+		},
+		set notes(v: string) {
+			notes = v;
+		},
+		get storyPoints() {
+			return storyPoints;
+		},
+		set storyPoints(v: number | null) {
+			storyPoints = v;
+		},
+		get effectiveDuration() {
+			return effectiveDuration;
+		},
+		set effectiveDuration(v: EffectiveDuration | null) {
+			effectiveDuration = v;
+		},
+		get funRating() {
+			return funRating;
+		},
+		set funRating(v: number | null) {
+			funRating = v;
+		},
+		get assignee() {
+			return assignee;
+		},
+		set assignee(v: ContactOrManual[]) {
+			assignee = v;
+		},
+		get involvedContacts() {
+			return involvedContacts;
+		},
+		set involvedContacts(v: ContactOrManual[]) {
+			involvedContacts = v;
+		},
+		get showDeleteConfirm() {
+			return showDeleteConfirm;
+		},
+		set showDeleteConfirm(v: boolean) {
+			showDeleteConfirm = v;
+		},
+		get isLoading() {
+			return isLoading;
+		},
+		set isLoading(v: boolean) {
+			isLoading = v;
+		},
+		get contactsAvailable() {
+			return contactsAvailable;
+		},
+		set contactsAvailable(v: boolean | null) {
+			contactsAvailable = v;
+		},
+
+		// Functions
+		initFromTask,
+		buildUpdateInput,
+		toContactReference,
+	};
+}