feat: add per-element mana regen disciplines for all 14 mana types

- Create data/disciplines/elemental-regen.ts (base + utility elements)
- Create data/disciplines/elemental-regen-advanced.ts (composite + exotic)
- Wire into ALL_DISCIPLINES via index.ts and discipline-slice.ts
- Add perElementRegenBonus to ComputedEffects type
- Merge regen_{element} discipline bonuses in computeAllEffects()
- Apply per-element regen to element mana each tick in gameStore
- Add 'Elemental Regen' and 'Advanced Regen' tabs to DisciplinesTab UI

src/components/game/tabs/DisciplinesTab.tsx

@@ -2,6 +2,8 @@ import React, { useEffect, useState, useCallback } from 'react';
 import { useDisciplineStore } from '@/lib/game/stores/discipline-slice';
 import type { DisciplineDefinition } from '@/lib/game/types/disciplines';
 import { baseDisciplines } from '@/lib/game/data/disciplines/base';
+import { elementalRegenDisciplines } from '@/lib/game/data/disciplines/elemental-regen';
+import { elementalRegenAdvancedDisciplines } from '@/lib/game/data/disciplines/elemental-regen-advanced';
 import { enchanterDisciplines } from '@/lib/game/data/disciplines/enchanter';
 import { fabricatorDisciplines } from '@/lib/game/data/disciplines/fabricator';
 import { invokerDisciplines } from '@/lib/game/data/disciplines/invoker';
@@ -18,6 +20,8 @@ interface AttunementTab {
 
 const ATTUNEMENT_TABS: AttunementTab[] = [
   { key: 'base', label: 'Base', items: baseDisciplines },
+  { key: 'elemental-regen', label: 'Elemental Regen', items: elementalRegenDisciplines },
+  { key: 'elemental-regen-advanced', label: 'Advanced Regen', items: elementalRegenAdvancedDisciplines },
   { key: 'enchanter', label: 'Enchanter', items: enchanterDisciplines },
   { key: 'fabricator', label: 'Fabricator', items: fabricatorDisciplines },
   { key: 'invoker', label: 'Invoker', items: invokerDisciplines },