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/newsletter/src/server/actions/newsletter-actions.ts

@@ -9,13 +9,12 @@ import { getSupabaseServerClient } from '@kit/supabase/server-client';
 import {
   CreateNewsletterSchema,
   UpdateNewsletterSchema,
-  CreateTemplateSchema,
 } from '../../schema/newsletter.schema';
 import { createNewsletterApi } from '../api';
 
 export const createNewsletter = authActionClient
   .inputSchema(CreateNewsletterSchema)
-  .action(async ({ parsedInput: input, ctx }) => {
+  .action(async ({ parsedInput: input, ctx: _ctx }) => {
     const client = getSupabaseServerClient();
     const logger = await getLogger();
     const api = createNewsletterApi(client);
@@ -29,7 +28,7 @@ export const createNewsletter = authActionClient
 
 export const updateNewsletter = authActionClient
   .inputSchema(UpdateNewsletterSchema)
-  .action(async ({ parsedInput: input, ctx }) => {
+  .action(async ({ parsedInput: input, ctx: _ctx }) => {
     const client = getSupabaseServerClient();
     const logger = await getLogger();
     const api = createNewsletterApi(client);
@@ -51,7 +50,7 @@ export const createTemplate = authActionClient
       variables: z.array(z.string()).optional(),
     }),
   )
-  .action(async ({ parsedInput: input, ctx }) => {
+  .action(async ({ parsedInput: input, ctx: _ctx }) => {
     const client = getSupabaseServerClient();
     const logger = await getLogger();
     const api = createNewsletterApi(client);
@@ -74,7 +73,7 @@ export const addRecipients = authActionClient
         .optional(),
     }),
   )
-  .action(async ({ parsedInput: input, ctx }) => {
+  .action(async ({ parsedInput: input, ctx: _ctx }) => {
     const client = getSupabaseServerClient();
     const logger = await getLogger();
     const api = createNewsletterApi(client);
@@ -95,7 +94,7 @@ export const dispatchNewsletter = authActionClient
       newsletterId: z.string().uuid(),
     }),
   )
-  .action(async ({ parsedInput: input, ctx }) => {
+  .action(async ({ parsedInput: input, ctx: _ctx }) => {
     const client = getSupabaseServerClient();
     const logger = await getLogger();
     const api = createNewsletterApi(client);

packages/features/newsletter/src/server/api.ts

@@ -25,7 +25,7 @@ function substituteVariables(
 }
 
 export function createNewsletterApi(client: SupabaseClient<Database>) {
-  const db = client;
+  const _db = client;
 
   return {
     // --- Templates ---
@@ -254,7 +254,7 @@ export function createNewsletterApi(client: SupabaseClient<Database>) {
       for (const recipient of pending) {
         try {
           // Substitute variables in the body
-          const personalizedHtml = substituteVariables(newsletter.body_html, {
+          const _personalizedHtml = substituteVariables(newsletter.body_html, {
             first_name: (recipient.name ?? '').split(' ')[0] ?? '',
             name: recipient.name ?? '',
             email: recipient.email ?? '',