fix: resolve sync inflation, signature mismatch, CP accuracy, auto-buy cap, unlock hints

- #147: Guard all patch functions with hasChanged before incrementing
  sync counter to prevent inflation on no-op patches
- #148: Clear stale HMAC signature after each boss fight so subsequent
  auto-saves do not send a mismatched signature
- #146: Auto-unlock adventurer-specific upgrades in applyTick when
  their adventurer count > 0; show recruit hint in upgrade panel
- #149: Add Essence/s row to resource bar dropdown
- #150: Fix broken auto-quest CP reduce formula; centralise via
  computePartyCombatPower which applies all multipliers correctly
- #151: Cap auto-buy at 100 for non-max-tier adventurers; max tier
  (highest level unlocked) remains uncapped
- #152: Export computePartyCombatPower from tick, applying global
  upgrades, prestige, equipment, set bonuses, echo, crafted, and
  companion multipliers; use it in resource bar and boss panel

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

@@ -7,6 +7,8 @@
 /* eslint-disable react/no-multi-comp -- Sub-component is tightly coupled to the panel */
 /* eslint-disable max-lines-per-function -- Complex component with many render paths */
 /* eslint-disable complexity -- UpgradeCard has many conditional render paths for states */
+/* eslint-disable max-statements -- UpgradePanel builds hints from three sources */
+/* eslint-disable max-lines -- Upgrade panel with sub-component exceeds line limit */
 import { type JSX, useState } from "react";
 import { useGame } from "../../context/gameContext.js";
 import { cdnImage } from "../../utils/cdn.js";
@@ -238,6 +240,22 @@ const UpgradePanel = (): JSX.Element => {
       }
     }
   }
+  for (const upgrade of locked) {
+    if (
+      !upgradeUnlockHints.has(upgrade.id)
+      && upgrade.adventurerId !== undefined
+    ) {
+      const adventurerForHint = adventurers.find((a) => {
+        return a.id === upgrade.adventurerId;
+      });
+      if (adventurerForHint !== undefined) {
+        upgradeUnlockHints.set(
+          upgrade.id,
+          `🗡️ Recruit: ${adventurerForHint.name}`,
+        );
+      }
+    }
+  }
 
   function handleToggle(): void {
     setShowLocked((current) => {