fix: QA audit — lint cleanup, i18n fixes, module visibility, sidebar UX

- Fix 97 lint errors → 0 (unused imports, params, variables across 40+ files)
- Fix i18n key format: colon → dot notation for next-intl compatibility
- Add missing i18n keys (routes.application, routes.home, confirm)
- Fix module visibility: sidebar now respects per-account DB features
- Fix inject function: use dot-notation keys, add collapsed:true defaults
- Fix ConfirmDialog: use useTranslations instead of hardcoded German defaults
- Fix events page: replace placeholder 'Beschreibung' with proper description
- Fix Dockerfile: add NEXT_PUBLIC_CI ARG for Docker builds
- Collapse secondary sidebar sections by default for cleaner UX

apps/web/components/confirm-dialog.tsx

@@ -1,5 +1,7 @@
 'use client';
 
+import { useTranslations } from 'next-intl';
+
 import {
   AlertDialog,
   AlertDialogAction,
@@ -26,11 +28,15 @@ export function ConfirmDialog({
   trigger,
   title,
   description,
-  confirmLabel = 'Bestätigen',
-  cancelLabel = 'Abbrechen',
+  confirmLabel,
+  cancelLabel,
   variant = 'default',
   onConfirm,
 }: ConfirmDialogProps) {
+  const t = useTranslations('common');
+  const resolvedConfirmLabel = confirmLabel ?? t('confirm');
+  const resolvedCancelLabel = cancelLabel ?? t('cancel');
+
   return (
     <AlertDialog>
       <AlertDialogTrigger
@@ -42,7 +48,7 @@ export function ConfirmDialog({
           <AlertDialogDescription>{description}</AlertDialogDescription>
         </AlertDialogHeader>
         <AlertDialogFooter>
-          <AlertDialogCancel>{cancelLabel}</AlertDialogCancel>
+          <AlertDialogCancel>{resolvedCancelLabel}</AlertDialogCancel>
           <AlertDialogAction
             onClick={onConfirm}
             className={
@@ -51,7 +57,7 @@ export function ConfirmDialog({
                 : ''
             }
           >
-            {confirmLabel}
+            {resolvedConfirmLabel}
           </AlertDialogAction>
         </AlertDialogFooter>
       </AlertDialogContent>