Story phase 4: help when stuck, the arcade opens with the story

- From the third attempt at a checkpoint, the death screen offers TRY
  AGAIN · WITH HELP, at most two tiers, said openly. In the cup the help
  is fresher legs and a longer swing; in gore, one more heart and a
  slower director and horde. Every checkpoint passed resets the offer.
- The arcade shows only what the story has opened. Training and Classic
  open after act I, the Climb after II, Splatter Gore after III, and
  hosting a friend after IV (joining stays free). Locked doors are shown
  greyed with the act that opens them.
- The non-story endings point at the story instead of the cup.
- Store switches for the free tier (act I's card points at the full
  game) and a premium arcade, both off.
- The prologue's HUD no longer overlaps the kill pips.

PROJECT.md logs phases 1-4. One new test. v382, staging only.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

index.html

@@ -601,6 +601,12 @@ if (location.hostname !== 'splatter-tennis.wuwi.one' && !window.Capacitor?.isNat
     background-size: cover; background-position: center; image-rendering: pixelated;
     text-align: left; cursor: pointer; }
   #modeList button.mode:last-child { grid-column: 1 / -1; }
+  /* THE ARCADE OPENS WITH THE STORY: a shut door is shown, greyed, with the act that opens it */
+  #modeList button.mode.locked, #mGore.locked { filter: grayscale(1) brightness(.5); cursor: default; }
+  #modeList button.mode .cb i { display: block; margin-top: 4px; font: 400 9px Silkscreen, monospace; letter-spacing: 1px; color: #e0cc72; }
+  .nope { animation: nope .35s; }
+  @keyframes nope { 20%, 60% { transform: translateX(-5px); } 40%, 80% { transform: translateX(5px); } }
+  #vsHostLock { font: 400 10px Silkscreen, monospace; color: #e0cc72; letter-spacing: 1px; margin: 0 0 8px; }
   #modeList button.mode::after { content: ''; position: absolute; inset: 0; pointer-events: none;
     background: linear-gradient(0deg, rgba(6,10,8,.94), rgba(6,10,8,.2) 65%, transparent); }
   #modeList .cb { position: relative; z-index: 1; }
@@ -1094,6 +1100,7 @@ if (location.hostname !== 'splatter-tennis.wuwi.one' && !window.Capacitor?.isNat
         <input id="vsName" class="tin" maxlength="12" placeholder="YOUR NAME" autocomplete="off"
                autocapitalize="characters" spellcheck="false">
         <h3>HOST</h3>
+        <p id="vsHostLock"></p>
         <button class="btn" id="vsHostC">CLASSIC</button>
         <button class="btn" id="vsHostD">DEATH MATCH</button>
         <h3>JOIN</h3>
@@ -1188,6 +1195,6 @@ if (location.hostname !== 'splatter-tennis.wuwi.one' && !window.Capacitor?.isNat
   </div>
 </div>
 <span id="recLamp" hidden>REC</span>
-<script type="module" src="src/main.js?v=381"></script>
+<script type="module" src="src/main.js?v=382"></script>
 </body>
 </html>