perf(background): reduce reactive update lock duration to 1.0s

AI_INIT.md

@@ -98,10 +98,11 @@ The following features are critical and must not be removed or fundamentally alt
 > [!CAUTION]
 > **AI AGENTS MUST FOLLOW THIS EXACT SEQUENCE WHEN RELEASING A NEW VERSION OR TAGGING.**
 > The CI pipeline automatically injects the version from the git tag into `manifest.base.json`, `shared/constants.js`, and `package.json`. You do NOT need to manually bump version numbers.
-1. Commit all code changes and push to `main`.
-2. Create and push a new tag. **MANDATORY**: Tags MUST start with a `v` (e.g., `v1.4.0`). The GitHub Actions release workflow is strictly configured to ignore any tags without the `v` prefix.
-3. The CI will extract the version from the tag (e.g., `v1.4.0` → `1.4.0`), inject it into all source files, build the extension artifacts, publish the Docker image, and create a GitHub Release.
-4. Verify the release builds on GitHub Actions.
+1. **MANDATORY SYNTAX CHECK**: Before staging, committing, or pushing any changes, you **MUST** run a syntax validation check using `node -c` on every single modified JavaScript file (e.g., `node -c extension/background.js` and `node -c extension/content.js`). **NEVER** commit or push code that fails this check.
+2. Commit all verified code changes and push to `main`.
+3. Create and push a new tag. **MANDATORY**: Tags MUST start with a `v` (e.g., `v1.4.0`). The GitHub Actions release workflow is strictly configured to ignore any tags without the `v` prefix.
+4. The CI will extract the version from the tag (e.g., `v1.4.0` → `1.4.0`), inject it into all source files, build the extension artifacts, publish the Docker image, and create a GitHub Release.
+5. Verify the release builds on GitHub Actions.
 
 ### Adding a Protocol Event
 1. Add the event name to `shared/constants.js`.

extension/background.js

@@ -560,6 +560,18 @@ function handleServerEvent(event, data) {
                     playbackState: 'playing'
                 });
             }
+
+            // Reset reactive update locks for all peers so the next playing heartbeat is accepted immediately
+            if (currentRoom && Array.isArray(currentRoom.peers)) {
+                currentRoom.peers.forEach(peer => {
+                    if (peer && typeof peer === 'object') {
+                        peer.lastReactiveUpdate = 0;
+                    }
+                });
+                if (storageInitialized) chrome.storage.session.set({ currentRoom });
+                chrome.runtime.sendMessage({ type: 'PEER_UPDATE', peers: currentRoom.peers }).catch(() => {});
+            }
+
             routeToContent(event, data);
             break;
         case EVENTS.EVENT_ACK:
@@ -622,9 +634,9 @@ function handleServerEvent(event, data) {
                             peer.muted = data.muted !== undefined ? data.muted : peer.muted;
 
                             // Race condition guard: ignore heartbeat playbackState/currentTime 
-                            // if we applied a reactive user action in the last 1.5 seconds.
+                            // if we applied a reactive user action in the last 1.0 second.
                             const timeSinceReactive = peer.lastReactiveUpdate ? (Date.now() - peer.lastReactiveUpdate) : Infinity;
-                            const ignoreStatus = timeSinceReactive < 1500;
+                            const ignoreStatus = timeSinceReactive < 1000;
 
                             if (!ignoreStatus) {
                                 peer.playbackState = data.playbackState !== undefined ? data.playbackState : peer.playbackState;
@@ -702,6 +714,18 @@ function executeForceSync() {
         forceSyncAcks: [], 
         forceSyncDeadline: null 
     });
+
+    // Reset reactive update locks for all peers so the next playing heartbeat is accepted immediately
+    if (currentRoom && Array.isArray(currentRoom.peers)) {
+        currentRoom.peers.forEach(peer => {
+            if (peer && typeof peer === 'object') {
+                peer.lastReactiveUpdate = 0;
+            }
+        });
+        if (storageInitialized) chrome.storage.session.set({ currentRoom });
+        chrome.runtime.sendMessage({ type: 'PEER_UPDATE', peers: currentRoom.peers }).catch(() => {});
+    }
+
     emit(EVENTS.FORCE_SYNC_EXECUTE, {});
     routeToContent(EVENTS.FORCE_SYNC_EXECUTE, {});
     addLog('Force Sync Executed', 'success');
@@ -866,6 +890,8 @@ chrome.alarms.onAlarm.addListener(async (alarm) => {
             });
         }
     }
+});
+
 function leaveOldRoomIfSwitching(newRoomId) {
     if (currentRoom && currentRoom.roomId !== newRoomId) {
         addLog(`Switching rooms: leaving ${currentRoom.roomId} to join ${newRoomId}`, 'info');

extension/manifest.base.json

@@ -1,7 +1,7 @@
 {
   "manifest_version": 3,
   "name": "KoalaSync",
-  "version": "1.4.5",
+  "version": "1.5.2",
   "description": "Watch party extension to synchronize video playback on YouTube, Twitch, Netflix, and HTML5 sites in real-time with friends.",
   "permissions": [
     "storage",

package.json

@@ -1,6 +1,6 @@
 {
   "name": "koalasync",
-  "version": "1.4.5",
+  "version": "1.5.2",
   "description": "KoalaSync Build Scripts",
   "private": true,
   "scripts": {

website/version.json

@@ -1,4 +1,4 @@
 {
-  "version": "1.4.5",
-  "date": "2026-05-18T17:24:42Z"
+  "version": "1.5.2",
+  "date": "2026-05-18T18:09:45Z"
 }