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/src/components/GameBoyFrame.vue

@@ -144,8 +144,8 @@ function toggleInventory() {
       </div>
     </template>
 
-    <!-- Mini Bottom Status Bar for Adventure/Role Play Mode -->
-    <div v-else class="adventure-bottom-bar">
+    <!-- Mini Bottom Status Bar for Adventure/Role Play Mode (Hidden on Finale Certificate) -->
+    <div v-else-if="store.currentAct !== 'finale'" class="adventure-bottom-bar">
       <div class="adv-stat">
         <span class="adv-icon">👑</span>
         <span class="adv-val">{{ store.kronkorken }} Korken</span>