fix(affixes): use ActualMana for MultiplyByCurrentMana modifier

Change MultiplyByCurrentMana to reference ActualMana formula instead of Mana.
ActualMana returns CurrentMana when using_custom_mana flag is set,
otherwise returns full Mana - enabling accurate current mana calculations.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: justjuangui

src/lib/context/affix-converters/variable-modifiers.ts

@@ -34,7 +34,7 @@ export const VARIABLE_MODIFIER_STAT_MAP: Record<
   },
   MultiplyByCurrentMana: {
     modifier: "MultiplyByCurrentMana",
-    statReference: "Mana",
+    statReference: "ActualMana",
     operation: "multiply",
   },
   MultiplyByMissingLife: {