refactor: remove skill system leftovers, migrate click mana to discipline perk

- Simplified getMeditationBonus() to continuous ramp formula
- Added click-mana capped perk to Mana Circulation discipline
- Removed manaWell/manaFlow/manaSpring skill reads and prestige upgrades
- Removed all skill fields from GameState and GameActionType
- Updated all call sites and tests (916 tests passing)

Closes #174

src/lib/game/hooks/useGameDerived.ts

@@ -39,17 +39,17 @@ export function useManaStats() {
   );
 
   const maxMana = useMemo(
-    () => computeMaxMana({ skills: {}, prestigeUpgrades, skillUpgrades: {}, skillTiers: {} }, upgradeEffects),
+    () => computeMaxMana({ prestigeUpgrades }, upgradeEffects),
     [prestigeUpgrades, upgradeEffects]
   );
 
   const baseRegen = useMemo(
-    () => computeRegen({ skills: {} as Record<string, number>, prestigeUpgrades, attunements: {} } as any, upgradeEffects),
+    () => computeRegen({ prestigeUpgrades, attunements: {} } as any, upgradeEffects),
     [prestigeUpgrades, upgradeEffects]
   );
 
   const clickMana = useMemo(
-    () => computeClickMana({}),
+    () => computeClickMana(),
     []
   );
 
@@ -157,7 +157,7 @@ export function useCombatStats() {
     const attackSpeedMult = upgradeEffects.attackSpeedMultiplier;
     const totalCastSpeed = spellCastSpeed * quickCastBonus * attackSpeedMult;
 
-    const damagePerCast = calcDamage({ skills: {}, signedPacts }, activeSpell, floorElem);
+    const damagePerCast = calcDamage({ signedPacts }, activeSpell, floorElem);
     const castsPerSecond = totalCastSpeed * HOURS_PER_TICK / (TICK_MS / 1000);
 
     return damagePerCast * castsPerSecond;
@@ -195,7 +195,7 @@ export function useCombatStats() {
       precisionChance,
       elemBonus,
       elemBonusText,
-      total: calcDamage({ skills: {}, signedPacts }, activeSpell, floorElem),
+      total: calcDamage({ signedPacts }, activeSpell, floorElem),
     };
   }, [activeSpellDef, signedPacts, activeSpell, floorElem, isGuardianFloor, pactMultiplier]);
 
@@ -217,17 +217,17 @@ export function useCombatStats() {
  */
 export function useStudyStats() {
   const studySpeedMult = useMemo(
-    () => getStudySpeedMultiplier({}),
+    () => getStudySpeedMultiplier(),
     []
   );
 
   const studyCostMult = useMemo(
-    () => getStudyCostMultiplier({}),
+    () => getStudyCostMultiplier(),
     []
   );
 
   const upgradeEffects = useMemo(
-    () => computeEffects({}, {}),
+    () => computeEffects(),
     []
   );