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

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

packages/web/server/lib/opencode/settings-helpers.js

@@ -325,6 +325,12 @@ export const createSettingsHelpers = (dependencies) => {
         result.chatRenderMode = mode;
       }
     }
+    if (typeof candidate.messageStreamTransport === 'string') {
+      const mode = candidate.messageStreamTransport.trim();
+      if (mode === 'auto' || mode === 'ws' || mode === 'sse') {
+        result.messageStreamTransport = mode;
+      }
+    }
     if (typeof candidate.activityRenderMode === 'string') {
       const mode = candidate.activityRenderMode.trim();
       if (mode === 'collapsed' || mode === 'summary') {