feat(sasch40): polish retro game layout, clean tavern scene, and improve mobile HUD

- Hide GameBoy D-Pad and action buttons during RPG and dialogue modes
- Add prequel intro landing screen for QR code arrivals with Haumdaucher lore
- Clean baked-in text from tavern scene background and streamline navigation bar
- Add safe-zone margins and HTML HUD in platformer and party express acts
- Optimize Certificate modal layout and scoring breakdown for mobile screens
- Add automated end-to-end browser playtest script with Puppeteer
- Accelerate Docker build via native pre-compilation

projects/sasch40/frontend/Dockerfile

@@ -1,18 +1,6 @@
-FROM node:22-alpine AS build
-
-WORKDIR /app
-
-COPY package.json package-lock.json* ./
-
-RUN npm install
-
-COPY . .
-
-RUN npm run build
-
 FROM nginx:alpine
 
-COPY --from=build /app/dist /usr/share/nginx/html
+COPY dist /usr/share/nginx/html
 COPY nginx.conf /etc/nginx/conf.d/default.conf
 
 EXPOSE 80