feat(web): add WebSocket transport for message event streaming with SSE fallback (#764)

* feat: add websocket message stream transport

* fix: avoid false missing session directories in sidebar

* fix: re-probe project root session directories

* refactor: use button group for message stream transport

* fix: resolve chat input hook dependency warning

---------

Co-authored-by: Bohdan Triapitsyn <artmore@protonmail.com>

packages/web/server/lib/opencode/shutdown-runtime.js

@@ -13,6 +13,8 @@ export const createGracefulShutdownRuntime = (dependencies) => {
     clearHealthCheckInterval,
     getTerminalRuntime,
     setTerminalRuntime,
+    getMessageStreamRuntime,
+    setMessageStreamRuntime,
     shouldSkipOpenCodeStop,
     getOpenCodePort,
     getOpenCodeProcess,
@@ -54,6 +56,16 @@ export const createGracefulShutdownRuntime = (dependencies) => {
       }
     }
 
+    const messageStreamRuntime = getMessageStreamRuntime();
+    if (messageStreamRuntime) {
+      try {
+        await messageStreamRuntime.close();
+      } catch {
+      } finally {
+        setMessageStreamRuntime(null);
+      }
+    }
+
     if (!shouldSkipOpenCodeStop()) {
       const portToKill = getOpenCodePort();
       const openCodeProcess = getOpenCodeProcess();