feat: content expansion, prestige shop, and offline earnings improvements

- Expand content to 18 zones, 72 bosses, 95 quests, 32 adventurer tiers
- Add prestige shop with 24 runestone upgrades across 5 categories
- Add PrestigeUpgrade type, data files, API routes, and frontend panel
- Fix offline earnings to include equipment and runestone multipliers
- Add offline essence calculation alongside offline gold
- Update OfflineModal to display both gold and essence earned
- Add IDEAS.md for tracking planned features

apps/web/src/engine/tick.ts

@@ -57,6 +57,10 @@ export const applyTick = (state: GameState, deltaSeconds: number): GameState =>
     1,
   );
 
+  const runestonesIncome = state.prestige.runestonesIncomeMultiplier ?? 1;
+  const runestonesEssence = state.prestige.runestonesEssenceMultiplier ?? 1;
+  const runestonesCrystal = state.prestige.runestonesCrystalMultiplier ?? 1;
+
   let goldGained = 0;
   let essenceGained = 0;
 
@@ -81,6 +85,7 @@ export const applyTick = (state: GameState, deltaSeconds: number): GameState =>
       adventurer.count *
       upgradeMultiplier *
       prestige *
+      runestonesIncome *
       equipmentGoldMultiplier *
       deltaSeconds;
 
@@ -89,6 +94,7 @@ export const applyTick = (state: GameState, deltaSeconds: number): GameState =>
       adventurer.count *
       upgradeMultiplier *
       prestige *
+      runestonesEssence *
       deltaSeconds;
   }
 
@@ -117,7 +123,7 @@ export const applyTick = (state: GameState, deltaSeconds: number): GameState =>
       } else if (reward.type === "essence" && reward.amount != null) {
         questEssence += reward.amount;
       } else if (reward.type === "crystals" && reward.amount != null) {
-        questCrystals += reward.amount;
+        questCrystals += reward.amount * runestonesCrystal;
       } else if (reward.type === "upgrade" && reward.targetId != null) {
         updatedUpgrades = updatedUpgrades.map((u) =>
           u.id === reward.targetId ? { ...u, unlocked: true } : u,
@@ -250,5 +256,13 @@ export const calculateClickPower = (state: GameState): number => {
     .filter((e) => e.equipped && e.bonus.clickMultiplier != null)
     .reduce((mult, e) => mult * (e.bonus.clickMultiplier ?? 1), 1);
 
-  return state.baseClickPower * clickMultiplier * state.prestige.productionMultiplier * equipmentClickMultiplier;
+  const runestonesClick = state.prestige.runestonesClickMultiplier ?? 1;
+
+  return (
+    state.baseClickPower *
+    clickMultiplier *
+    state.prestige.productionMultiplier *
+    runestonesClick *
+    equipmentClickMultiplier
+  );
 };