fix: resolve all Priority 5 CRASH/BLOCKER issues (#51-#57)

- #51: Fix broken import path @/types/disciplines → @/lib/game/types/disciplines
- #52: Fix canProceedDiscipline() called with wrong arguments in discipline-slice.ts
- #53: Add local useState for activeAttunement tab filtering in DisciplinesTab
- #54: Make canProceedDiscipline() defensive when gameState is undefined
- #57: Remove stale CraftingTab export from game/index.ts
- Refactored DisciplineCard to use Zustand selector subscriptions properly
- Added DisciplinePerk type import to discipline-math.ts

src/lib/game/utils/discipline-math.ts

@@ -1,7 +1,7 @@
 // ─── Discipline Math Utilities ────────────────────────────────────────────────
 // Continuous scaling formulas for Active Disciplines
 
-import type { DisciplineState, DisciplineDefinition } from '../types/disciplines';
+import type { DisciplineState, DisciplineDefinition, DisciplinePerk } from '../types/disciplines';
 
 /**
  * Calculate continuous stat bonus from discipline XP
@@ -64,21 +64,25 @@ export function canActivateDiscipline(
  */
 export function canProceedDiscipline(
   discipline: DisciplineDefinition,
-  disciplineState: DisciplineState,
-  gameState: { elements?: Record<string, any>; rawMana?: number }
+  disciplineState: DisciplineState | undefined,
+  gameState?: { elements?: Record<string, any>; rawMana?: number }
 ): boolean {
+  if (!disciplineState) return true;
   if (disciplineState.paused) return false;
-  
+
+  // If no game state provided, allow activation (optimistic)
+  if (!gameState) return true;
+
   const drain = calculateManaDrain(
     discipline.drainBase,
     disciplineState.xp,
     discipline.difficultyFactor
   );
-  
+
   if (discipline.manaType === 'raw') {
     return (gameState.rawMana || 0) >= drain;
   }
-  
+
   const element = gameState.elements?.[discipline.manaType];
   return element && element.current >= drain;
 }