feat: another balance and bug fix pass (#238)

Working through open issues — fixes, balance changes, and features.

## Closed

- Closes #161
- Closes #181
- Closes #191
- Closes #199
- Closes #201
- Closes #202
- Closes #203
- Closes #204
- Closes #205
- Closes #206
- Closes #208
- Closes #211
- Closes #212
- Closes #213
- Closes #214
- Closes #216
- Closes #219
- Closes #220
- Closes #221
- Closes #222
- Closes #224
- Closes #225
- Closes #226
- Closes #228
- Closes #229
- Closes #230
- Closes #231
- Closes #232
- Closes #233
- Closes #234
- Closes #235
- Closes #236

✨ This PR was created with help from Hikari~ 🌸

Reviewed-on: #238
Co-authored-by: Hikari <hikari@nhcarrigan.com>
Co-committed-by: Hikari <hikari@nhcarrigan.com>

apps/api/src/routes/prestige.ts

@@ -15,6 +15,7 @@ import { updateChallengeProgress } from "../services/dailyChallenges.js";
 import { logger } from "../services/logger.js";
 import {
   buildPostPrestigeState,
+  calculatePrestigeThreshold,
   computeRunestoneMultipliers,
   isEligibleForPrestige,
 } from "../services/prestige.js";
@@ -40,10 +41,15 @@ prestigeRouter.post("/", async(context) => {
     const state = record.state as unknown as GameState;
 
     if (!isEligibleForPrestige(state)) {
+      const thresholdMultiplier
+        = state.transcendence?.echoPrestigeThresholdMultiplier ?? 1;
+      const required = calculatePrestigeThreshold(
+        state.prestige.count,
+        thresholdMultiplier,
+      );
       return context.json(
         {
-          // eslint-disable-next-line stylistic/max-len -- Error message cannot be shortened
-          error: "Not eligible for prestige — collect 1,000,000 total gold first",
+          error: `Not eligible for prestige — collect ${required.toLocaleString()} total gold first`,
         },
         400,
       );