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/lib/game/stores/discipline-slice.ts

@@ -11,6 +11,8 @@ import {
   getUnlockedPerks,
 } from '../utils/discipline-math';
 import { baseDisciplines } from '../data/disciplines/base';
+import { elementalRegenDisciplines } from '../data/disciplines/elemental-regen';
+import { elementalRegenAdvancedDisciplines } from '../data/disciplines/elemental-regen-advanced';
 import { enchanterDisciplines } from '../data/disciplines/enchanter';
 import { enchanterUtilityDisciplines } from '../data/disciplines/enchanter-utility';
 import { enchanterSpellDisciplines } from '../data/disciplines/enchanter-spells';
@@ -21,6 +23,8 @@ import { MAX_CONCURRENT_DISCIPLINES } from '../types/disciplines';
 
 const ALL_DISCIPLINES = [
   ...baseDisciplines,
+  ...elementalRegenDisciplines,
+  ...elementalRegenAdvancedDisciplines,
   ...enchanterDisciplines,
   ...enchanterUtilityDisciplines,
   ...enchanterSpellDisciplines,