chore(release): 4.67.2 [skip ci]

## [4.67.2](https://github.com/antialias/soroban-abacus-flashcards/compare/v4.67.1...v4.67.2) (2025-10-23)

### Performance Improvements

* **complement-race:** increase train position update frequency to 60fps ([fffaf1d](fffaf1df1d))

CHANGELOG.md

@@ -1,3 +1,17 @@
+## [4.67.2](https://github.com/antialias/soroban-abacus-flashcards/compare/v4.67.1...v4.67.2) (2025-10-23)
+
+
+### Performance Improvements
+
+* **complement-race:** increase train position update frequency to 60fps ([fffaf1d](https://github.com/antialias/soroban-abacus-flashcards/commit/fffaf1df1d4d55c811bf634c957691e3564470d6))
+
+## [4.67.1](https://github.com/antialias/soroban-abacus-flashcards/compare/v4.67.0...v4.67.1) (2025-10-22)
+
+
+### Bug Fixes
+
+* **complement-race:** fix react-spring interpolation TypeScript errors ([0add9e4](https://github.com/antialias/soroban-abacus-flashcards/commit/0add9e4ef1d69e4e92ffe279cce09c68efa43714))
+
 ## [4.67.0](https://github.com/antialias/soroban-abacus-flashcards/compare/v4.66.2...v4.67.0) (2025-10-22)
 
 

apps/web/src/app/arcade/complement-race/components/RaceTrack/GhostTrain.tsx

@@ -1,6 +1,6 @@
 'use client'
 
-import { useSpring, useSprings, animated } from '@react-spring/web'
+import { useSpring, useSprings, animated, to } from '@react-spring/web'
 import { useMemo, useRef } from 'react'
 import type { PlayerState } from '@/arcade-games/complement-race/types'
 import type { RailroadTrackGenerator } from '../../lib/RailroadTrackGenerator'
@@ -146,10 +146,9 @@ export function GhostTrain({
     <g ref={ghostRef} data-component="ghost-train" data-player-id={player.id}>
       {/* Ghost locomotive - animated */}
       <animated.g
-        transform={locomotiveSpring.x.to(
-          (x, y, rot) => `translate(${x}, ${y}) rotate(${rot}) scale(-1, 1)`,
-          locomotiveSpring.y,
-          locomotiveSpring.rotation
+        transform={to(
+          [locomotiveSpring.x, locomotiveSpring.y, locomotiveSpring.rotation],
+          (x, y, rot) => `translate(${x}, ${y}) rotate(${rot}) scale(-1, 1)`
         )}
         opacity={locomotiveSpring.opacity}
       >
@@ -208,10 +207,9 @@ export function GhostTrain({
       {carSprings.map((spring, index) => (
         <animated.g
           key={`car-${index}`}
-          transform={spring.x.to(
-            (x, y, rot) => `translate(${x}, ${y}) rotate(${rot}) scale(-1, 1)`,
-            spring.y,
-            spring.rotation
+          transform={to(
+            [spring.x, spring.y, spring.rotation],
+            (x, y, rot) => `translate(${x}, ${y}) rotate(${rot}) scale(-1, 1)`
           )}
           opacity={spring.opacity}
         >

apps/web/src/app/arcade/complement-race/hooks/useSteamJourney.ts

@@ -34,7 +34,7 @@ const MOMENTUM_DECAY_RATES = {
 
 const MOMENTUM_GAIN_PER_CORRECT = 15 // Momentum added for each correct answer
 const SPEED_MULTIPLIER = 0.15 // Convert momentum to speed (% per second at momentum=100)
-const UPDATE_INTERVAL = 50 // Update every 50ms (~20 fps)
+const UPDATE_INTERVAL = 16 // Update every 16ms (~60 fps for smooth animation)
 const GAME_DURATION = 60000 // 60 seconds in milliseconds
 
 export function useSteamJourney() {

apps/web/src/arcade-games/complement-race/Provider.tsx

@@ -365,7 +365,7 @@ export function ComplementRaceProvider({ children }: { children: ReactNode }) {
   const MOMENTUM_GAIN_PER_CORRECT = 15
   const MOMENTUM_LOSS_PER_WRONG = 10
   const SPEED_MULTIPLIER = 0.15 // momentum * 0.15 = % per second
-  const UPDATE_INTERVAL = 50 // 50ms = ~20fps
+  const UPDATE_INTERVAL = 16 // 16ms = ~60fps for smooth animation
 
   // Transform multiplayer state to look like single-player state
   const compatibleState = useMemo((): CompatibleGameState => {
@@ -486,7 +486,12 @@ export function ComplementRaceProvider({ children }: { children: ReactNode }) {
     if (multiplayerState.gamePhase !== 'playing') {
       hasInitializedPositionRef.current = false
     }
-  }, [multiplayerState.gamePhase, multiplayerState.config.style, multiplayerState.players, localPlayerId])
+  }, [
+    multiplayerState.gamePhase,
+    multiplayerState.config.style,
+    multiplayerState.players,
+    localPlayerId,
+  ])
 
   // Initialize game start time when game becomes active
   useEffect(() => {
@@ -636,7 +641,7 @@ export function ComplementRaceProvider({ children }: { children: ReactNode }) {
 
     console.log('[POS_BROADCAST] Starting position broadcast interval')
 
-    // Send position update every 100ms for smoother ghost trains (reads from refs to avoid restarting interval)
+    // Send position update every 16ms (~60fps) for smoother ghost trains (reads from refs to avoid restarting interval)
     const interval = setInterval(() => {
       const currentPos = clientPositionRef.current
       broadcastCountRef.current++
@@ -659,7 +664,7 @@ export function ComplementRaceProvider({ children }: { children: ReactNode }) {
         userId: viewerId || '',
         data: { position: currentPos },
       } as ComplementRaceMove)
-    }, 100)
+    }, 16)
 
     return () => {
       console.log(`[POS_BROADCAST] Stopping interval (sent ${broadcastCountRef.current} updates)`)

package.json

@@ -1,6 +1,6 @@
 {
   "name": "soroban-monorepo",
-  "version": "4.67.0",
+  "version": "4.67.2",
   "private": true,
   "description": "Beautiful Soroban Flashcard Generator - Monorepo",
   "workspaces": [