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/event-management/src/server/actions/event-actions.ts

@@ -16,7 +16,7 @@ import { createEventManagementApi } from '../api';
 
 export const createEvent = authActionClient
   .inputSchema(CreateEventSchema)
-  .action(async ({ parsedInput: input, ctx }) => {
+  .action(async ({ parsedInput: input, ctx: _ctx }) => {
     const client = getSupabaseServerClient();
     const logger = await getLogger();
     const api = createEventManagementApi(client);
@@ -29,7 +29,7 @@ export const createEvent = authActionClient
 
 export const updateEvent = authActionClient
   .inputSchema(UpdateEventSchema)
-  .action(async ({ parsedInput: input, ctx }) => {
+  .action(async ({ parsedInput: input, ctx: _ctx }) => {
     const client = getSupabaseServerClient();
     const logger = await getLogger();
     const api = createEventManagementApi(client);
@@ -42,7 +42,7 @@ export const updateEvent = authActionClient
 
 export const deleteEvent = authActionClient
   .inputSchema(z.object({ eventId: z.string().uuid() }))
-  .action(async ({ parsedInput: input, ctx }) => {
+  .action(async ({ parsedInput: input, ctx: _ctx }) => {
     const client = getSupabaseServerClient();
     const logger = await getLogger();
     const api = createEventManagementApi(client);
@@ -55,7 +55,7 @@ export const deleteEvent = authActionClient
 
 export const registerForEvent = authActionClient
   .inputSchema(EventRegistrationSchema)
-  .action(async ({ parsedInput: input, ctx }) => {
+  .action(async ({ parsedInput: input, ctx: _ctx }) => {
     const client = getSupabaseServerClient();
     const logger = await getLogger();
     const api = createEventManagementApi(client);
@@ -68,7 +68,7 @@ export const registerForEvent = authActionClient
 
 export const createHolidayPass = authActionClient
   .inputSchema(CreateHolidayPassSchema)
-  .action(async ({ parsedInput: input, ctx }) => {
+  .action(async ({ parsedInput: input, ctx: _ctx }) => {
     const client = getSupabaseServerClient();
     const logger = await getLogger();
     const api = createEventManagementApi(client);

packages/features/event-management/src/server/api.ts

@@ -11,7 +11,7 @@ import type {
 
 export function createEventManagementApi(client: SupabaseClient<Database>) {
   const PAGE_SIZE = 25;
-  const db = client;
+  const _db = client;
 
   return {
     async listEvents(