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/.dockerignore

@@ -0,0 +1,5 @@
+node_modules
+.git
+scripts
+*.log
+.DS_Store