fix: Improve condo ID handling and add error message

Prevents client-side generation of condo IDs, delegating this to the backend/service for consistency.
Introduces an alert for save condo errors and ensures the active condo is correctly updated or set.
Adds logic to auto-select the first condo if none is active.

Dockerfile

@@ -1,15 +0,0 @@
-# Stage 1: Build del frontend
-FROM node:20-alpine as build
-WORKDIR /app
-COPY package*.json ./
-RUN npm install
-COPY . .
-RUN npm run build
-
-# Stage 2: Serve con Nginx
-FROM nginx:alpine
-COPY --from=build /app/dist /usr/share/nginx/html
-COPY nginx.conf /etc/nginx/conf.d/default.conf
-EXPOSE 80
-CMD ["nginx", "-g", "daemon off;"]
-