feat(inventory): add quick item creation to workbench ListView

Adds a "Gegenstand hinzufügen" button that expands into an inline form
with a collection picker dropdown and name input. Items are created
directly via itemsStore.create() without leaving the workbench panel.

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

apps/mana/apps/web/src/lib/modules/inventory/ListView.svelte

@@ -1,13 +1,15 @@
 <!--
   Inventory — Workbench ListView
-  Collections and items overview.
+  Collections overview with quick item creation.
 -->
 <script lang="ts">
 	import { useLiveQueryWithDefault } from '@mana/local-store/svelte';
 	import { db } from '$lib/data/database';
 	import { BaseListView } from '@mana/shared-ui';
+	import { Plus } from '@mana/shared-icons';
 	import type { ViewProps } from '$lib/app-registry';
 	import type { LocalCollection, LocalItem } from './types';
+	import { itemsStore } from './stores/items.svelte';
 
 	let { navigate }: ViewProps = $props();
 
@@ -29,6 +31,28 @@
 	}
 
 	const totalValue = $derived(items.reduce((sum, i) => sum + (i.purchaseData?.price ?? 0), 0));
+
+	// ── Quick-add item ──────────────────────────────────────
+	let showAdd = $state(false);
+	let newItemName = $state('');
+	let selectedCollectionId = $state<string | null>(null);
+
+	// Default to first collection
+	$effect(() => {
+		if (!selectedCollectionId && collections.length > 0) {
+			selectedCollectionId = collections[0]!.id;
+		}
+	});
+
+	async function addItem() {
+		const name = newItemName.trim();
+		if (!name || !selectedCollectionId) return;
+		await itemsStore.create({
+			collectionId: selectedCollectionId,
+			name,
+		});
+		newItemName = '';
+	}
 </script>
 
 <BaseListView items={collections} getKey={(c) => c.id} emptyTitle="Keine Sammlungen">
@@ -39,6 +63,43 @@
 		{/if}
 	{/snippet}
 
+	{#snippet listHeader()}
+		{#if collections.length > 0}
+			{#if showAdd}
+				<form
+					onsubmit={(e) => {
+						e.preventDefault();
+						addItem();
+					}}
+					class="quick-add"
+				>
+					<select class="collection-select" bind:value={selectedCollectionId}>
+						{#each collections as col (col.id)}
+							<option value={col.id}>
+								{col.icon ? `${col.icon} ` : ''}{col.name}
+							</option>
+						{/each}
+					</select>
+					<!-- svelte-ignore a11y_autofocus -->
+					<input
+						class="add-input"
+						bind:value={newItemName}
+						placeholder="Neuer Gegenstand..."
+						autofocus
+					/>
+					<button type="submit" class="submit-btn" disabled={!newItemName.trim()}>
+						<Plus size={14} />
+					</button>
+				</form>
+			{:else}
+				<button class="add-toggle" onclick={() => (showAdd = true)}>
+					<Plus size={14} />
+					<span>Gegenstand hinzufügen</span>
+				</button>
+			{/if}
+		{/if}
+	{/snippet}
+
 	{#snippet item(collection)}
 		<button
 			onclick={() =>
@@ -62,3 +123,91 @@
 		</button>
 	{/snippet}
 </BaseListView>
+
+<style>
+	.quick-add {
+		display: flex;
+		align-items: center;
+		gap: 0.375rem;
+		padding: 0.375rem;
+		margin-bottom: 0.625rem;
+		border-radius: 0.375rem;
+		border: 1px solid hsl(var(--color-border));
+		background: transparent;
+	}
+
+	.collection-select {
+		flex-shrink: 0;
+		max-width: 7rem;
+		padding: 0.1875rem 0.375rem;
+		border: none;
+		border-right: 1px solid hsl(var(--color-border));
+		background: transparent;
+		color: hsl(var(--color-muted-foreground));
+		font-size: 0.6875rem;
+		outline: none;
+		cursor: pointer;
+	}
+	.collection-select option {
+		background: hsl(var(--color-card));
+		color: hsl(var(--color-foreground));
+	}
+
+	.add-input {
+		flex: 1;
+		min-width: 0;
+		border: none;
+		background: transparent;
+		outline: none;
+		font-size: 0.8125rem;
+		color: hsl(var(--color-foreground));
+		padding: 0.125rem 0.25rem;
+	}
+	.add-input::placeholder {
+		color: hsl(var(--color-muted-foreground));
+	}
+
+	.submit-btn {
+		display: flex;
+		align-items: center;
+		justify-content: center;
+		width: 24px;
+		height: 24px;
+		border: none;
+		border-radius: 0.25rem;
+		background: transparent;
+		color: hsl(var(--color-muted-foreground));
+		cursor: pointer;
+		flex-shrink: 0;
+		transition: all 0.15s;
+	}
+	.submit-btn:hover:not(:disabled) {
+		background: hsl(var(--color-surface-hover));
+		color: hsl(var(--color-foreground));
+	}
+	.submit-btn:disabled {
+		opacity: 0.3;
+		cursor: default;
+	}
+
+	.add-toggle {
+		display: flex;
+		align-items: center;
+		gap: 0.375rem;
+		width: 100%;
+		padding: 0.375rem 0.5rem;
+		margin-bottom: 0.625rem;
+		border: 1px dashed hsl(var(--color-border));
+		border-radius: 0.375rem;
+		background: transparent;
+		color: hsl(var(--color-muted-foreground));
+		font-size: 0.75rem;
+		cursor: pointer;
+		transition: all 0.15s;
+	}
+	.add-toggle:hover {
+		border-color: hsl(var(--color-border-strong));
+		color: hsl(var(--color-foreground));
+		background: hsl(var(--color-surface-hover));
+	}
+</style>