fix: resolve critical bugs - disciplines, debug reset, floating point, spire loop

Fixes:
- Issue 193: Remove unnecessary useEffect that set activeTab when spireMode is true, and redundant setAction('climb') in SpireCombatPage
- Issue 194: Fix signed_pact prerequisite check in checkDisciplinePrerequisites by accepting signedPacts param; add 'At Limit' feedback on discipline button when concurrent limit reached
- Issue 195: Add resetDisciplines(), resetAttunements(), resetCrafting() calls to createResetGame; add resetCrafting action to crafting store
- Issue 196: Fix floating point display in ElementStatsSection (mana pools) and GameStateDebug (time); fix duplicate 'Base Regen' label in ManaStatsSection

All 917 tests pass. Files stay under 400-line limit.

src/app/page.tsx

@@ -171,12 +171,6 @@ export default function ManaLoopGame() {
   const [mounted, setMounted] = useState(false);
   useEffect(() => { setMounted(true); }, []); // eslint-disable-line react-hooks/set-state-in-effect
 
-  useEffect(() => {
-    if (spireMode) {
-      setActiveTab('spells'); // eslint-disable-line react-hooks/set-state-in-effect
-    }
-  }, [spireMode]);
-
   if (gameOver) {
     return <GameOverScreen day={day} hour={hour} insightGained={loopInsight} totalInsight={insight} />;
   }