fix: SkillsTab barrel export, equipment store reads, LabTab re-export, debug null guards, GrimoireTab loaded state, spire tab switching

src/components/game/tabs/index.ts

@@ -6,7 +6,7 @@ export { SpireTab } from './SpireTab';
 export { SpellsTab } from './SpellsTab';
 export { LabTab } from './LabTab';
 // SkillsTab is now exported from src/components/game/index.ts
-// export { SkillsTab } from './SkillsTab';
+export { SkillsTab } from '../SkillsTab';
 export { StatsTab } from './StatsTab';
 export { EquipmentTab } from './EquipmentTab';
 export { AttunementsTab } from './AttunementsTab';