fix(#165,#166,#167,#168,#169,#171,#172): resolve 7 open bug issues

#172 - Grimoire tab: removed dead 'loaded' state guard that permanently showed loading
#169 - Transference Mana Flow: added elements param to checkDisciplinePrerequisites so mana type unlocks are verified
#168 - Perk descriptions: wired 4 broken perks (enchant-2, channel-1, golem-2, efficiency-1) with actual bonus effects; fixed enchant-1 interval (5→50); fixed study-mana-enchantments stat (maxMana→maxManaBonus)
#171 - Shields: removed all shield equipment (4 types), recipes, category, slot mappings; added 'shields' to AGENTS.md banned list
#166 - regenMultiplier: merged disciplineEffects.multipliers.regenMultiplier into computeAllEffects()
#165 - Meditation cap: added meditationCap display to ManaStatsSection UI; updated perk description
#167 - XP accumulation: added Meditative Mastery base discipline with disciplineXpBonus stat; wired into tick pipeline

src/components/game/LootInventory/icons.ts

@@ -3,7 +3,6 @@ import {
   Sparkles,
   Package,
   Sword,
-  Shield,
   Shirt,
   Crown,
   Wrench
@@ -11,7 +10,6 @@ import {
 
 export const CATEGORY_ICONS: Record<string, typeof Sword> = {
   caster: Sword,
-  shield: Shield,
   catalyst: Sparkles,
   head: Crown,
   body: Shirt,