feat: add daily challenges system

Three PST-midnight-resetting challenges generated deterministically per
day from click, boss, quest, and prestige types. Progress tracked
server-side for bosses and prestige, client-side for clicks and quests.
Crystal rewards awarded on completion and preserved through prestige resets.

apps/web/src/engine/tick.ts

@@ -1,4 +1,5 @@
 import type { Achievement, Equipment, GameState } from "@elysium/types";
+import { updateChallengeProgress } from "../utils/dailyChallenges.js";
 
 /**
  * Checks all achievements against the current game state and returns an updated
@@ -198,6 +199,23 @@ export const applyTick = (state: GameState, deltaSeconds: number): GameState =>
     });
   }
 
+  // Count quests newly completed this tick and update daily challenge progress
+  const newlyCompletedQuestCount = updatedQuests.filter(
+    (q, i) => q.status === "completed" && state.quests[i]?.status !== "completed",
+  ).length;
+
+  let updatedDailyChallenges = state.dailyChallenges;
+  let challengeCrystals = 0;
+  if (updatedDailyChallenges && newlyCompletedQuestCount > 0) {
+    const result = updateChallengeProgress(
+      updatedDailyChallenges,
+      "questsCompleted",
+      newlyCompletedQuestCount,
+    );
+    updatedDailyChallenges = result.updatedChallenges;
+    challengeCrystals = result.crystalsAwarded;
+  }
+
   const newGold = capResource(state.resources.gold + goldGained + questGold);
   const newEssence = capResource(state.resources.essence + essenceGained + questEssence);
   const newTotalGoldEarned = state.player.totalGoldEarned + goldGained + questGold;
@@ -208,8 +226,9 @@ export const applyTick = (state: GameState, deltaSeconds: number): GameState =>
       ...state.resources,
       gold: newGold,
       essence: newEssence,
-      crystals: capResource(state.resources.crystals + questCrystals),
+      crystals: capResource(state.resources.crystals + questCrystals + challengeCrystals),
     },
+    dailyChallenges: updatedDailyChallenges,
     player: {
       ...state.player,
       totalGoldEarned: newTotalGoldEarned,