fix: add missing pactAffinity prestige upgrade to PRESTIGE_DEF

src/components/game/tabs/PrestigeTab.test.ts

@@ -28,9 +28,9 @@ describe('Tab barrel export', () => {
 // ─── Test: Prestige upgrade definitions ────────────────────────────────────────
 
 describe('Prestige upgrade definitions', () => {
-  it('has exactly 15 prestige upgrades', async () => {
+  it('has exactly 16 prestige upgrades', async () => {
     const { PRESTIGE_DEF } = await import('@/lib/game/constants/prestige');
-    expect(Object.keys(PRESTIGE_DEF).length).toBe(15);
+    expect(Object.keys(PRESTIGE_DEF).length).toBe(16);
   });
 
   it('all upgrades have required fields', async () => {
@@ -43,13 +43,14 @@ describe('Prestige upgrade definitions', () => {
     }
   });
 
-  it('all 15 expected upgrade IDs are present', async () => {
+  it('all 16 expected upgrade IDs are present', async () => {
     const { PRESTIGE_DEF } = await import('@/lib/game/constants/prestige');
     const expectedIds = [
       'manaWell', 'manaFlow', 'insightAmp', 'spireKey',
       'temporalEcho', 'steadyHand', 'ancientKnowledge', 'elementalAttune',
       'spellMemory', 'guardianPact', 'quickStart', 'elemStart',
       'unlockedManaTypeCapacity', 'pactBinding', 'pactInterferenceMitigation',
+      'pactAffinity',
     ];
     for (const id of expectedIds) {
       expect(PRESTIGE_DEF[id]).toBeDefined();

src/lib/game/constants/prestige.ts

@@ -17,4 +17,5 @@ export const PRESTIGE_DEF: Record<string, PrestigeDef> = {
   unlockedManaTypeCapacity: { name: "Mana Type Capacity", desc: "+10 capacity for selected mana type", max: 5, cost: 1000 },
   pactBinding:  { name: "Pact Binding",  desc: "+1 pact slot per level",     max: 5,  cost: 2000 },
   pactInterferenceMitigation: { name: "Pact Interference Mitigation", desc: "Reduces pact interference penalty", max: 10, cost: 1500 },
+  pactAffinity: { name: "Pact Affinity", desc: "+10% pact ritual speed per level", max: 9, cost: 2500 },
 };