chore: community feedback fixes and UI improvements (#102)

## Summary

Addresses all community feedback tickets from the last deploy, plus several UI improvements made during the same session.

### Bug fixes & balance
- **#97** — Fix auto-adventurer tier priority: sort by combat power instead of current cost so the highest-tier affordable unit is always purchased
- **#98** — Add Dark Templar adventurer (80k CP) to bridge the Volcanic Depths progression wall; rewire upgrade and quest rewards accordingly
- **#99** — Reorder and buff Shadow Assassin (55k CP, level 12) so Witch Coven feels rewarding rather than a regression
- **#100** — Display effective Gold/s (all multipliers applied) in the resource bar
- **#101** — Add Peasant tier 2 (10x, essence) and tier 3 (50x, crystals) upgrades for meaningful late-game scaling

### Other fixes
- Sync game state to server before auto-boss challenges (matching manual challenge behaviour)
- Refresh Discord avatar hash on every game load via bot token so stale CDN URLs are corrected automatically

### UI improvements
- Replace Donate / Discord / Support / View Profile / Edit Profile buttons with a single avatar dropdown menu
- Collapse all resources except Gold into a click-to-toggle dropdown; orange alert dot appears when a hidden resource is capped

## Closes

Closes #97
Closes #98
Closes #99
Closes #100
Closes #101

Reviewed-on: #102
Co-authored-by: Hikari <hikari@nhcarrigan.com>
Co-committed-by: Hikari <hikari@nhcarrigan.com>

apps/api/src/routes/game.ts

@@ -27,6 +27,7 @@ import { currentSchemaVersion } from "../data/schemaVersion.js";
 import { prisma } from "../db/client.js";
 import { authMiddleware } from "../middleware/auth.js";
 import { getOrResetDailyChallenges } from "../services/dailyChallenges.js";
+import { fetchDiscordUserById } from "../services/discord.js";
 import { logger } from "../services/logger.js";
 import { calculateOfflineEarnings } from "../services/offlineProgress.js";
 import {
@@ -685,11 +686,34 @@ gameRouter.get("/load", async(context) => {
   try {
     const discordId = context.get("discordId");
 
-    const [ record, playerRecord ] = await Promise.all([
-      prisma.gameState.findUnique({ where: { discordId } }),
-      prisma.player.findUnique({ where: { discordId } }),
+    const [ [ record, playerRecord ], freshDiscordUser ] = await Promise.all([
+      Promise.all([
+        prisma.gameState.findUnique({ where: { discordId } }),
+        prisma.player.findUnique({ where: { discordId } }),
+      ]),
+      fetchDiscordUserById(discordId),
     ]);
 
+    // Refresh avatar in DB when Discord returns an updated hash
+    if (
+      freshDiscordUser !== null
+      && playerRecord !== null
+      && freshDiscordUser.avatar !== playerRecord.avatar
+    ) {
+      playerRecord.avatar = freshDiscordUser.avatar;
+      void prisma.player.update({
+        data:  { avatar: freshDiscordUser.avatar },
+        where: { discordId },
+      }).catch((error: unknown) => {
+        void logger.error(
+          "avatar_refresh",
+          error instanceof Error
+            ? error
+            : new Error(String(error)),
+        );
+      });
+    }
+
     if (!record) {
       // No save found — create a fresh state (handles nuked DB or first-time load race)
       if (!playerRecord) {
@@ -757,6 +781,7 @@ gameRouter.get("/load", async(context) => {
      */
     if (playerRecord !== null) {
       state.player.characterName = playerRecord.characterName;
+      state.player.avatar = playerRecord.avatar;
     }
 
     const now = Date.now();