fix (SSE): Prevent heartbeat from aborting in-progress connections (#8783)

* fix (SSE): Send server keep-alives

* Push a devcontainer for testing

* Bump devcontainer's Node heap size

* Fix devcontainer's Go version

* Add debugging logs

* Modify devcontainer so I can upload my own binary

* Fix heartbeat triggering reconnect during CONNECTING state

* Revert "fix (SSE): Send server keep-alives"

This reverts commit a719a8c.

* Remove SSE debugging logs

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* Remove devcontainer (moved to separate PR)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

Author: ericpgreen2

web-common/src/runtime-client/sse-connection-manager.ts

@@ -80,7 +80,9 @@ export class SSEConnectionManager {
    */
   private async reconnect() {
     // Prevent concurrent reconnection attempts
-    if (this.isReconnecting) return;
+    if (this.isReconnecting) {
+      return;
+    }
     this.isReconnecting = true;
 
     try {
@@ -117,7 +119,10 @@ export class SSEConnectionManager {
    * Stop the connection, mark closed and clean up resources
    */
   public heartbeat = async () => {
-    if (get(this.status) !== ConnectionStatus.OPEN) {
+    const status = get(this.status);
+    // Only reconnect if PAUSED (intentionally disconnected to save resources)
+    // Don't reconnect if CONNECTING (already in progress) or CLOSED (fatal error)
+    if (status === ConnectionStatus.PAUSED) {
       await this.reconnect();
     }