feat: add equipment set bonuses and boss bounty runestones

- Define EquipmentSet type + computeSetBonuses utility in packages/types
- Add setId field to Equipment type and assign sets to 27 equipment items
- Create 9 named equipment sets (Iron Vanguard → Eternal Throne) with 2pc/3pc bonuses
- Apply set combat multiplier in boss route
- Apply set gold/click multipliers in tick engine and click handler
- Include set bonuses in anti-cheat delta validation
- Show active set bonus strip + set badge per card in EquipmentPanel
- Add boss first-kill bounty runestones (scaling 1–10 per boss tier)
- Update AboutPanel and IDEAS.md

apps/web/src/styles.css

@@ -498,6 +498,11 @@ body {
   font-size: 0.9rem;
 }
 
+.boss-bounty {
+  color: #a78bfa;
+  font-weight: bold;
+}
+
 .attack-button {
   align-self: flex-start;
   background: linear-gradient(135deg, #ef4444, #b91c1c);
@@ -862,6 +867,11 @@ body {
   margin: 0.5rem 0;
 }
 
+.battle-bounty {
+  color: #a78bfa;
+  font-weight: bold;
+}
+
 .dismiss-button {
   background: var(--colour-accent);
   border: none;
@@ -945,6 +955,46 @@ body {
   margin-bottom: 1.25rem;
 }
 
+.active-sets {
+  background: rgba(138, 43, 226, 0.08);
+  border: 1px solid rgba(138, 43, 226, 0.3);
+  border-radius: 8px;
+  padding: 0.75rem 1rem;
+  margin-bottom: 1.25rem;
+}
+
+.active-sets-heading {
+  font-size: 0.9rem;
+  font-weight: 600;
+  color: #bf7fff;
+  margin: 0 0 0.5rem;
+}
+
+.active-set-row {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 0.4rem 1rem;
+  align-items: baseline;
+  font-size: 0.82rem;
+  margin-bottom: 0.25rem;
+}
+
+.active-set-name {
+  font-weight: 600;
+  color: #d4a0ff;
+}
+
+.active-set-bonus {
+  color: var(--colour-text-muted);
+}
+
+.equipment-set-badge {
+  display: inline-block;
+  font-size: 0.75rem;
+  color: #bf7fff;
+  margin-top: 0.2rem;
+}
+
 .equipment-slot-section {
   margin-bottom: 1.5rem;
 }