feat: communicate quest failure mechanics in the UI

Closes #80

apps/web/src/components/game/aboutPanel.tsx

@@ -44,7 +44,11 @@ const howToPlay = [
     body:
       "Send your guild on quests that complete over time and reward gold,"
       + " essence, crystals, equipment, and upgrades. Multiple quests can run"
-      + " simultaneously. Completing quests also unlocks new zones.",
+      + " simultaneously. Completing quests also unlocks new zones."
+      + " Each quest has a failure chance that increases in later zones"
+      + " (from 10% in the starting zone up to 40% in the hardest zones)."
+      + " If a quest fails, no rewards are granted and the quest resets —"
+      + " your party must be sent again to retry it.",
     title: "📜 Quests",
   },
   {

apps/web/src/components/game/questPanel.tsx

@@ -10,6 +10,7 @@
 /* eslint-disable max-statements -- Many local variables needed for quest state */
 import { useState, type JSX } from "react";
 import { useGame } from "../../context/gameContext.js";
+import { zoneFailureChance } from "../../engine/tick.js";
 import { cdnImage } from "../../utils/cdn.js";
 import { LockToggle } from "../ui/lockToggle.js";
 import { ZoneSelector } from "./zoneSelector.js";
@@ -143,8 +144,18 @@ const QuestCard = ({
               : null}
           </>
         }
+        {quest.status === "available"
+          && <p className="quest-failure-chance">
+            {"🎲 "}
+            {String(Math.round((zoneFailureChance[quest.zoneId] ?? 0) * 100))}
+            {"% failure chance — if failed, the quest resets"}
+            {" and must be retried."}
+          </p>
+        }
         {quest.status === "available" && quest.lastFailedAt !== undefined
-          && <p className="quest-failed-hint">{"⚠️ Last attempt failed"}</p>
+          && <p className="quest-failed-hint">
+            {"⚠️ Last attempt failed — no rewards were granted."}
+          </p>
         }
         {quest.status === "available"
           && <button

apps/web/src/engine/tick.ts

@@ -93,7 +93,7 @@ export const RESOURCE_CAP = 1e300;
  * On failure the quest resets to "available" with no rewards; the player must wait the
  * full duration again on their next attempt.
  */
-const zoneFailureChance: Record<string, number> = {
+export const zoneFailureChance: Record<string, number> = {
   abyssal_trench:    0.24,
   astral_void:       0.2,
   celestial_reaches: 0.22,