Merge remote-tracking branch 'origin/dev' into feat/user-routes

# Conflicts:
#	backend/src/controllers/students.ts
#	backend/src/controllers/teachers.ts
#	backend/src/data/classes/class-join-request-repository.ts
#	backend/src/routes/students.ts
#	backend/src/services/students.ts
#	backend/src/services/teachers.ts
#	backend/tests/test_assets/users/students.testdata.ts
#	frontend/src/controllers/controllers.ts
#	frontend/src/queries/themes.ts

frontend/src/controllers/base-controller.ts

@@ -7,7 +7,7 @@ export class BaseController {
         this.baseUrl = `${apiConfig.baseUrl}/${basePath}`;
     }
 
-    protected async get<T>(path: string, queryParams?: Record<string, any>): Promise<T> {
+    protected async get<T>(path: string, queryParams?: Record<string, string | number | boolean>): Promise<T> {
         let url = `${this.baseUrl}${path}`;
         if (queryParams) {
             const query = new URLSearchParams();

frontend/src/controllers/themes.ts

@@ -5,12 +5,12 @@ export class ThemeController extends BaseController {
         super("theme");
     }
 
-    getAll(language: string | null = null) {
+    async getAll(language: string | null = null): Promise<unknown> {
         const query = language ? { language } : undefined;
-        return this.get<any[]>("/", query);
+        return this.get("/", query);
     }
 
-    getHruidsByKey(themeKey: string) {
+    async getHruidsByKey(themeKey: string): Promise<string[]> {
         return this.get<string[]>(`/${encodeURIComponent(themeKey)}`);
     }
 }