diff --git a/apps/web/src/components/dashboard/widget-catalog-modal.test.tsx b/apps/web/src/components/dashboard/widget-catalog-modal.test.tsx
new file mode 100644
index 0000000..d3d33ad
--- /dev/null
+++ b/apps/web/src/components/dashboard/widget-catalog-modal.test.tsx
@@ -0,0 +1,128 @@
+import { cleanup, fireEvent, render, screen } from '@testing-library/react';
+import userEvent from '@testing-library/user-event';
+import { afterEach, describe, expect, it, vi } from 'vitest';
+
+// Mock next-intl useTranslations, namespaced like the real catalog/common usage.
+vi.mock('next-intl', () => ({
+  useTranslations: (namespace: string) => (key: string) => {
+    const translations: Record<string, Record<string, string>> = {
+      widgets: {
+        catalogTitle: 'Widget hinzufügen',
+        catalogClose: 'Dialog schließen',
+        'clock.name': 'Uhr',
+        'clock.description': 'Zeigt die aktuelle Zeit',
+        'search.name': 'Suche',
+        'search.description': 'Schnellsuche',
+        'calendar.name': 'Kalender',
+        'calendar.description': 'Kommende Termine',
+        'note.name': 'Notiz',
+        'note.description': 'Schnelle Notizen',
+        'calculator.name': 'Taschenrechner',
+        'calculator.description': 'Einfache Berechnungen',
+        'favorites.name': 'Favoriten',
+        'favorites.description': 'Schnellzugriff auf Favoriten',
+        'stopwatch.name': 'Stoppuhr',
+        'stopwatch.description': 'Zeit messen',
+      },
+      common: {
+        close: 'Schließen',
+      },
+    };
+    return translations[namespace]?.[key] ?? key;
+  },
+}));
+
+import { WidgetCatalogModal } from './widget-catalog-modal';
+
+const baseProps = {
+  isOpen: true,
+  onClose: vi.fn(),
+  onAddWidget: vi.fn(),
+};
+
+afterEach(() => {
+  cleanup();
+  vi.clearAllMocks();
+});
+
+describe('WidgetCatalogModal', () => {
+  it('renders nothing when isOpen is false', () => {
+    render(<WidgetCatalogModal {...baseProps} isOpen={false} />);
+
+    expect(screen.queryByRole('dialog')).not.toBeInTheDocument();
+  });
+
+  it('renders the dialog with title and all widget type options when open', () => {
+    render(<WidgetCatalogModal {...baseProps} />);
+
+    expect(screen.getByRole('dialog', { name: 'Widget hinzufügen' })).toBeInTheDocument();
+    expect(screen.getByRole('button', { name: /Uhr/ })).toBeInTheDocument();
+  });
+
+  it('clicking the backdrop button closes the dialog (D-01)', async () => {
+    const onClose = vi.fn();
+    const user = userEvent.setup();
+
+    render(<WidgetCatalogModal {...baseProps} onClose={onClose} />);
+
+    await user.click(screen.getByRole('button', { name: 'Dialog schließen' }));
+
+    expect(onClose).toHaveBeenCalledOnce();
+  });
+
+  it('activating the backdrop button via a real keyboard Enter closes the dialog (D-01)', async () => {
+    const onClose = vi.fn();
+    const user = userEvent.setup();
+
+    render(<WidgetCatalogModal {...baseProps} onClose={onClose} />);
+
+    const backdrop = screen.getByRole('button', { name: 'Dialog schließen' });
+    backdrop.focus();
+    await user.keyboard('{Enter}');
+
+    expect(onClose).toHaveBeenCalledOnce();
+  });
+
+  it('clicking inside the dialog surface does not close the dialog', async () => {
+    const onClose = vi.fn();
+    const user = userEvent.setup();
+
+    render(<WidgetCatalogModal {...baseProps} onClose={onClose} />);
+
+    await user.click(screen.getByRole('dialog', { name: 'Widget hinzufügen' }));
+
+    expect(onClose).not.toHaveBeenCalled();
+  });
+
+  it('clicking a widget type option adds the widget and closes the dialog', async () => {
+    const onAddWidget = vi.fn();
+    const onClose = vi.fn();
+    const user = userEvent.setup();
+
+    render(<WidgetCatalogModal {...baseProps} onAddWidget={onAddWidget} onClose={onClose} />);
+
+    await user.click(screen.getByRole('button', { name: /Uhr/ }));
+
+    expect(onAddWidget).toHaveBeenCalledWith('clock');
+    expect(onClose).toHaveBeenCalledOnce();
+  });
+
+  it('pressing Escape closes the dialog', () => {
+    const onClose = vi.fn();
+
+    render(<WidgetCatalogModal {...baseProps} onClose={onClose} />);
+
+    fireEvent.keyDown(document, { key: 'Escape' });
+
+    expect(onClose).toHaveBeenCalledOnce();
+  });
+
+  it('the close button in the dialog header carries the shared common.close label', () => {
+    render(<WidgetCatalogModal {...baseProps} />);
+
+    // Two buttons named "Schließen": the header close icon button.
+    // Query specifically among the dialog's own buttons, excluding the backdrop
+    // (backdrop is named "Dialog schließen", the header button "Schließen").
+    expect(screen.getByRole('button', { name: 'Schließen' })).toBeInTheDocument();
+  });
+});
diff --git a/apps/web/src/components/dashboard/widget-catalog-modal.tsx b/apps/web/src/components/dashboard/widget-catalog-modal.tsx
index 118a144..5060c02 100644
--- a/apps/web/src/components/dashboard/widget-catalog-modal.tsx
+++ b/apps/web/src/components/dashboard/widget-catalog-modal.tsx
@@ -31,6 +31,7 @@ export function WidgetCatalogModal({
   onAddWidget,
 }: WidgetCatalogModalProps) {
   const t = useTranslations('widgets');
+  const tCommon = useTranslations('common');
   const dialogRef = useRef<HTMLDivElement>(null);
 
   // Focus trap + Escape handler
@@ -53,12 +54,16 @@ export function WidgetCatalogModal({
   if (!isOpen) return null;
 
   return (
-    <div
-      className="fixed inset-0 z-50 flex items-center justify-center"
-      onClick={onClose}
-    >
-      {/* Backdrop — visually only, hidden from assistive tech */}
-      <div className="fixed inset-0 bg-black/50" aria-hidden="true" />
+    <div className="fixed inset-0 z-50 flex items-center justify-center">
+      {/* Hintergrund — jetzt eine echte, benannte Schaltflaeche statt einer rein
+          optischen Flaeche: ein fokussierbares Element darf vor der Vorlesehilfe
+          nicht verborgen sein (D-01). */}
+      <button
+        type="button"
+        onClick={onClose}
+        aria-label={t('catalogClose')}
+        className="fixed inset-0 bg-black/50"
+      />
 
       {/* Dialog */}
       <div
@@ -67,7 +72,6 @@ export function WidgetCatalogModal({
         aria-modal="true"
         aria-label={t('catalogTitle')}
         className="relative z-50 w-full max-w-[480px] rounded-lg border bg-card p-6 shadow-xl"
-        onClick={(e) => e.stopPropagation()}
         tabIndex={-1}
       >
         {/* Header */}
@@ -79,7 +83,7 @@ export function WidgetCatalogModal({
             type="button"
             onClick={onClose}
             className="rounded-md p-1 text-muted-foreground transition-colors hover:bg-muted hover:text-foreground"
-            aria-label="Close"
+            aria-label={tCommon('close')}
           >
             <svg
               aria-hidden="true"
diff --git a/apps/web/src/messages/de.json b/apps/web/src/messages/de.json
index 81e346d..79d1b6a 100644
--- a/apps/web/src/messages/de.json
+++ b/apps/web/src/messages/de.json
@@ -206,6 +206,7 @@
     "emptyBody": "Klicken Sie auf Bearbeiten, um Widgets hinzuzufügen.",
     "addWidget": "Widget hinzufügen",
     "catalogTitle": "Widget hinzufügen",
+    "catalogClose": "Dialog schließen",
     "deleteTooltip": "Widget entfernen",
     "dragHint": "Ziehen Sie die Kachel, um sie zu verschieben",
     "editMode": "Dashboard bearbeiten",
diff --git a/apps/web/src/messages/en.json b/apps/web/src/messages/en.json
index 9221ad9..f07e26b 100644
--- a/apps/web/src/messages/en.json
+++ b/apps/web/src/messages/en.json
@@ -206,6 +206,7 @@
     "emptyBody": "Click edit to add widgets to your dashboard.",
     "addWidget": "Add widget",
     "catalogTitle": "Add widget",
+    "catalogClose": "Close dialog",
     "deleteTooltip": "Remove widget",
     "dragHint": "Drag the tile to move it",
     "editMode": "Edit dashboard",