Boobytrap decoys die their own deaths

Stepping on a face-down token flips it: a blank leaves the board the
moment it is discovered, instead of all four indicators lingering
until the real one detonates. The trap itself still waits, the caster
still strolls over everything unharmed, and the chronicle narrates
the flip so the table learns which squares stopped being scary.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015RCWSTnb1KYTPyL4GmhGnF

packages/web/src/net.svelte.ts

@@ -157,6 +157,7 @@ export function humanize(e: GameEvent): string | null {
     case "stuckInSlime": return `${e.player} squelches into the slime and sticks fast.`;
     case "boobytrapPlaced": return `${e.caster} places four suspicious tokens...`;
     case "boobytrapSprung": return `SNAP! ${e.player} finds the real boobytrap!`;
+    case "boobytrapBlank": return `${e.player} flips a face-down token — a blank. The rest still wait.`;
     case "objectsGlued": return `Everything on that square is glued down (${e.turns} turns).`;
     case "safeCreated": return `A massive safe slams down around the loot.`;
     case "safeOpened": return null;