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

packages/features/member-management/src/components/application-workflow.tsx

@@ -29,7 +29,7 @@ interface ApplicationWorkflowProps {
 export function ApplicationWorkflow({
   applications,
   accountId,
-  account,
+  account: _account,
 }: ApplicationWorkflowProps) {
   const router = useRouter();
 

packages/features/member-management/src/components/mandate-manager.tsx

@@ -23,7 +23,7 @@ interface MandateManagerProps {
   accountId: string;
 }
 
-const SEQUENCE_LABELS: Record<string, string> = {
+const _SEQUENCE_LABELS: Record<string, string> = {
   FRST: 'Erstlastschrift',
   RCUR: 'Wiederkehrend',
   FNAL: 'Letzte',

packages/features/member-management/src/components/members-data-table.tsx

@@ -44,7 +44,7 @@ export function MembersDataTable({
   pageSize,
   account,
   accountId,
-  duesCategories,
+  duesCategories: _duesCategories,
 }: MembersDataTableProps) {
   const router = useRouter();
   const searchParams = useSearchParams();