fix(web): start WS/SSE connections even when bot has no sessions

When a new bot had no sessions, initialize() returned early without
starting WebSocket, message events SSE, or local stream SSE. This
caused the first conversation to hang because stream events had no
delivery channel to reach the frontend.

apps/web/src/store/chat-list.ts

@@ -842,13 +842,13 @@ export const useChatStore = defineStore('chat', () => {
         messageEventsSince = ''
         sessionId.value = null
         replaceMessages([])
-        return
+      } else {
+        const activeSessionId = sessionId.value && visible.some((s) => s.id === sessionId.value)
+          ? sessionId.value
+          : visible[0]!.id
+        sessionId.value = activeSessionId
+        await loadMessages(bid, activeSessionId)
       }
-      const activeSessionId = sessionId.value && visible.some((s) => s.id === sessionId.value)
-        ? sessionId.value
-        : visible[0]!.id
-      sessionId.value = activeSessionId
-      await loadMessages(bid, activeSessionId)
       startWebSocket(bid)
       startMessageEvents(bid)
       startLocalStream(bid)