feat: show progress toward unlock conditions on achievement cards (#71)

## Summary

- Adds a `getCurrentProgress` helper that mirrors the tick engine's achievement-checking logic to compute the player's current progress for each condition type
- Locked achievement cards now display a `<progress>` bar and a numeric `{current} / {target}` label so players can see exactly how close they are to each achievement
- Unlocked achievements are unaffected — no progress bar shown once earned

## Test plan

- [ ] Verify locked achievement cards display a progress bar and numeric label
- [ ] Verify the progress values match what the tick engine uses for unlock checking
- [ ] Verify unlocked achievement cards show no progress bar
- [ ] Confirm lint, build, and tests all pass

Closes #57

Reviewed-on: #71
Co-authored-by: Hikari <hikari@nhcarrigan.com>
Co-committed-by: Hikari <hikari@nhcarrigan.com>

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

@@ -9,7 +9,7 @@ import { type JSX, useState } from "react";
 import { useGame } from "../../context/gameContext.js";
 import { cdnImage } from "../../utils/cdn.js";
 import { LockToggle } from "../ui/lockToggle.js";
-import type { Achievement } from "@elysium/types";
+import type { Achievement, GameState } from "@elysium/types";
 
 /**
  * Returns the plural form of a word based on a count.
@@ -54,9 +54,50 @@ const conditionDescription = (
   }
 };
 
+/**
+ * Returns the player's current progress value toward an achievement's unlock condition,
+ * mirroring the logic used by the tick engine's checkAchievements function.
+ * @param achievement - The achievement to evaluate progress for.
+ * @param state - The current game state.
+ * @returns The current numeric progress toward the achievement condition.
+ */
+const getCurrentProgress = (
+  achievement: Achievement,
+  state: GameState,
+): number => {
+  const { condition } = achievement;
+  switch (condition.type) {
+    case "totalGoldEarned":
+      return state.player.totalGoldEarned;
+    case "totalClicks":
+      return state.player.totalClicks;
+    case "bossesDefeated":
+      return state.bosses.filter((boss) => {
+        return boss.status === "defeated";
+      }).length;
+    case "questsCompleted":
+      return state.quests.filter((quest) => {
+        return quest.status === "completed";
+      }).length;
+    case "adventurerTotal":
+      return state.adventurers.reduce((sum, adventurer) => {
+        return sum + adventurer.count;
+      }, 0);
+    case "prestigeCount":
+      return state.prestige.count;
+    case "equipmentOwned":
+      return state.equipment.filter((item) => {
+        return item.owned;
+      }).length;
+    default:
+      return 0;
+  }
+};
+
 interface AchievementCardProperties {
-  readonly achievement:  Achievement;
-  readonly formatNumber: (n: number)=> string;
+  readonly achievement:   Achievement;
+  readonly formatNumber:  (n: number)=> string;
+  readonly progressValue: number;
 }
 
 /**
@@ -64,14 +105,18 @@ interface AchievementCardProperties {
  * @param props - The achievement card properties.
  * @param props.achievement - The achievement to display.
  * @param props.formatNumber - The number formatting utility function.
+ * @param props.progressValue - The player's current progress toward the unlock condition.
  * @returns The JSX element.
  */
+// eslint-disable-next-line max-lines-per-function -- Progress bar adds necessary lines for locked state
 const AchievementCard = ({
   achievement,
   formatNumber,
+  progressValue,
 }: AchievementCardProperties): JSX.Element => {
   const isUnlocked = achievement.unlockedAt !== null;
   const crystals = achievement.reward?.crystals;
+  const cappedProgress = Math.min(progressValue, achievement.condition.amount);
 
   return (
     <div className={`achievement-card ${isUnlocked
@@ -88,6 +133,19 @@ const AchievementCard = ({
         <p className="achievement-condition">
           {conditionDescription(achievement, formatNumber)}
         </p>
+        {!isUnlocked
+          && <div className="achievement-progress">
+            <progress
+              max={achievement.condition.amount}
+              value={cappedProgress}
+            />
+            <span className="achievement-progress-label">
+              {formatNumber(progressValue)}
+              {" / "}
+              {formatNumber(achievement.condition.amount)}
+            </span>
+          </div>
+        }
         {crystals !== undefined
           && <p className="achievement-reward">
             {"💎 +"}
@@ -163,6 +221,7 @@ const AchievementPanel = (): JSX.Element => {
               achievement={achievement}
               formatNumber={formatNumber}
               key={achievement.id}
+              progressValue={getCurrentProgress(achievement, state)}
             />
           );
         })}