feat: Add active job management for user and show progress in conversation list

- Implemented a new endpoint to retrieve active generation job IDs for the current user, enhancing user experience by allowing visibility of ongoing tasks.
- Integrated active job tracking in the Conversations component, displaying generation indicators based on active jobs.
- Optimized job management in the GenerationJobManager and InMemoryJobStore to support user-specific job queries, ensuring efficient resource handling and cleanup.
- Updated relevant components and hooks to utilize the new active jobs feature, improving overall application responsiveness and user feedback.

api/server/routes/agents/index.js

@@ -113,6 +113,17 @@ router.get('/chat/stream/:streamId', async (req, res) => {
   });
 });
 
+/**
+ * @route GET /chat/active
+ * @desc Get all active generation job IDs for the current user
+ * @access Private
+ * @returns { activeJobIds: string[] }
+ */
+router.get('/chat/active', async (req, res) => {
+  const activeJobIds = await GenerationJobManager.getActiveJobIdsForUser(req.user.id);
+  res.json({ activeJobIds });
+});
+
 /**
  * @route GET /chat/status/:conversationId
  * @desc Check if there's an active generation job for a conversation