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/web/src/context/gameContext.tsx

@@ -1094,11 +1094,7 @@ export const GameProvider = ({
               return adventurer.unlocked && next.resources.gold >= cost;
             }).
             sort((adventurerA, adventurerB) => {
-              const costA
-                = adventurerA.baseCost * Math.pow(1.15, adventurerA.count);
-              const costB
-                = adventurerB.baseCost * Math.pow(1.15, adventurerB.count);
-              return costB - costA;
+              return adventurerB.combatPower - adventurerA.combatPower;
             });
           if (bestAdventurer !== undefined) {
             const purchaseCost
@@ -1285,7 +1281,26 @@ export const GameProvider = ({
         if (availableBoss !== undefined) {
           const { id: bossId, name: bossName } = availableBoss;
           isAutoBossingReference.current = true;
-          void challengeBossApi({ bossId }).
+          const syncBeforeBoss
+            = stateReference.current !== null && !isSyncingReference.current
+              ? saveGame({
+                state: stateReference.current,
+                ...signatureReference.current === null
+                  ? {}
+                  : { signature: signatureReference.current },
+              }).then((response) => {
+                if (response.signature !== undefined) {
+                  signatureReference.current = response.signature;
+                  localStorage.setItem(
+                    "elysium_save_signature",
+                    response.signature,
+                  );
+                }
+              })
+              : Promise.resolve();
+          void syncBeforeBoss.then(async() => {
+            return await challengeBossApi({ bossId });
+          }).
             then((result) => {
               setState((previous) => {
                 if (previous === null) {