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/data/upgrades.ts

@@ -162,6 +162,34 @@ export const defaultUpgrades: Array<Upgrade> = [
     target:       "adventurer",
     unlocked:     false,
   },
+  {
+    adventurerId: "peasant",
+    costCrystals: 0,
+    costEssence:  20,
+    costGold:     0,
+    description:
+      "Organised labour guilds and proper scheduling make peasants ten times more productive.",
+    id:         "peasant_2",
+    multiplier: 10,
+    name:       "Guild Organisation",
+    purchased:  false,
+    target:     "adventurer",
+    unlocked:   false,
+  },
+  {
+    adventurerId: "peasant",
+    costCrystals: 50,
+    costEssence:  0,
+    costGold:     0,
+    description:
+      "Magical augmentation through crystalline resonance supercharges even the humblest worker.",
+    id:         "peasant_3",
+    multiplier: 50,
+    name:       "Crystal Augmentation",
+    purchased:  false,
+    target:     "adventurer",
+    unlocked:   false,
+  },
   {
     adventurerId: "militia",
     costCrystals: 0,
@@ -272,7 +300,7 @@ export const defaultUpgrades: Array<Upgrade> = [
   {
     adventurerId: "shadow_assassin",
     costCrystals: 0,
-    costEssence:  50,
+    costEssence:  175,
     costGold:     0,
     description:  "Mastery of the shadow arts doubles assassin effectiveness.",
     id:           "shadow_assassin_1",
@@ -295,6 +323,20 @@ export const defaultUpgrades: Array<Upgrade> = [
     target:       "adventurer",
     unlocked:     false,
   },
+  {
+    adventurerId: "dark_templar",
+    costCrystals: 0,
+    costEssence:  200,
+    costGold:     0,
+    description:
+      "A sworn oath to the darkness of the marshes doubles templar output.",
+    id:         "dark_templar_1",
+    multiplier: 2,
+    name:       "Templar's Oath",
+    purchased:  false,
+    target:     "adventurer",
+    unlocked:   false,
+  },
   {
     adventurerId: "void_walker",
     costCrystals: 0,