fix(contacts): remove groups store dependency from data page

- Remove groupsStore import and usage from data/+page.svelte
- Remove group filter from export options (groups feature not implemented)
- Clean up export button removal from ContactList

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/contacts/apps/web/src/lib/components/ContactList.svelte

@@ -26,7 +26,7 @@
 	let loadMoreTrigger: HTMLDivElement;
 
 	// Filter state
-	let selectedGroupId = $state<string | null>(null);
+	let selectedTagId = $state<string | null>(null);
 	let contactFilter = $state<ContactFilter>('all');
 	let birthdayFilter = $state<BirthdayFilter>('all');
 	let selectedCompany = $state<string | null>(null);
@@ -432,13 +432,13 @@
 		</button>
 		<FilterBar
 			contacts={contactsStore.contacts}
-			{selectedGroupId}
-			onGroupChange={(id) => {
-				selectedGroupId = id;
+			{selectedTagId}
+			onTagChange={(id) => {
+				selectedTagId = id;
 				if (id) {
-					contactsStore.setGroupId(id);
+					contactsStore.setTagId(id);
 				} else {
-					contactsStore.setGroupId(undefined);
+					contactsStore.setTagId(undefined);
 				}
 				contactsStore.loadContacts();
 			}}

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

@@ -8,7 +8,6 @@
 	import { importApi, type ImportPreviewResponse, type DuplicateAction } from '$lib/api/import';
 	import { exportApi, type ExportFormat } from '$lib/api/export';
 	import { contactsStore } from '$lib/stores/contacts.svelte';
-	import { groupsStore } from '$lib/stores/groups.svelte';
 	import '$lib/i18n';
 
 	type Tab = 'import' | 'export';
@@ -40,19 +39,11 @@
 	let includeArchived = $state(false);
 	let includeNotes = $state(true);
 	let includePhotos = $state(true);
-	let selectedGroupId = $state<string | null>(null);
 	let onlyFavorites = $state(false);
 	let isExporting = $state(false);
 	let exportError = $state<string | null>(null);
 	let exportSuccess = $state(false);
 
-	// Load groups for export filter
-	$effect(() => {
-		if (activeTab === 'export' && groupsStore.groups.length === 0) {
-			groupsStore.loadGroups();
-		}
-	});
-
 	function setActiveTab(tab: Tab) {
 		activeTab = tab;
 		updateUrl();
@@ -156,7 +147,6 @@
 		try {
 			await exportApi.exportContacts({
 				format: exportFormat,
-				groupId: selectedGroupId || undefined,
 				includeFavorites: onlyFavorites || undefined,
 				includeArchived,
 			});
@@ -529,20 +519,6 @@
 				<h3 class="font-semibold text-foreground">Filter</h3>
 
 				<div class="space-y-4">
-					<!-- Group Filter -->
-					<div>
-						<label class="block text-sm font-medium text-foreground mb-2">Gruppe</label>
-						<select
-							bind:value={selectedGroupId}
-							class="w-full px-3 py-2 bg-background border border-border rounded-lg text-foreground focus:outline-none focus:ring-2 focus:ring-primary/40"
-						>
-							<option value={null}>Alle Kontakte</option>
-							{#each groupsStore.groups as group}
-								<option value={group.id}>{group.name}</option>
-							{/each}
-						</select>
-					</div>
-
 					<!-- Favorites Only -->
 					<label class="flex items-center gap-3 cursor-pointer">
 						<input