⏸ refactor: Improve UX for Parallel Streams (Multi-Convo) (#11096)

* 🌊 feat: Implement multi-conversation feature with added conversation context and payload adjustments

* refactor: Replace isSubmittingFamily with isSubmitting across message components for consistency

* feat: Add loadAddedAgent and processAddedConvo for multi-conversation agent execution

* refactor: Update ContentRender usage to conditionally render PlaceholderRow based on isLast and isSubmitting

* WIP: first pass, sibling index

* feat: Enhance multi-conversation support with agent tracking and display improvements

* refactor: Introduce isEphemeralAgentId utility and update related logic for agent handling

* refactor: Implement createDualMessageContent utility for sibling message display and enhance useStepHandler for added conversations

* refactor: duplicate tools for added agent if ephemeral and primary agent is also ephemeral

* chore: remove deprecated multimessage rendering

* refactor: enhance dual message content creation and agent handling for parallel rendering

* refactor: streamline message rendering and submission handling by removing unused state and optimizing conditional logic

* refactor: adjust content handling in parallel mode to utilize existing content for improved agent display

* refactor: update @librechat/agents dependency to version 3.0.53

* refactor: update @langchain/core and @librechat/agents dependencies to latest versions

* refactor: remove deprecated @langchain/core dependency from package.json

* chore: remove unused SearchToolConfig and GetSourcesParams types from web.ts

* refactor: remove unused message properties from Message component

* refactor: enhance parallel content handling with groupId support in ContentParts and useStepHandler

* refactor: implement parallel content styling in Message, MessageRender, and ContentRender components. use explicit model name

* refactor: improve agent ID handling in createDualMessageContent for dual message display

* refactor: simplify title generation in AddedConvo by removing unused sender and preset logic

* refactor: replace string interpolation with cn utility for className in HoverButtons component

* refactor: enhance agent ID handling by adding suffix management for parallel agents and updating related components

* refactor: enhance column ordering in ContentParts by sorting agents with suffix management

* refactor: update @librechat/agents dependency to version 3.0.55

* feat: implement parallel content rendering with metadata support

- Added `ParallelContentRenderer` and `ParallelColumns` components for rendering messages in parallel based on groupId and agentId.
- Introduced `contentMetadataMap` to store metadata for each content part, allowing efficient parallel content detection.
- Updated `Message` and `ContentRender` components to utilize the new metadata structure for rendering.
- Modified `useStepHandler` to manage content indices and metadata during message processing.
- Enhanced `IJobStore` interface and its implementations to support storing and retrieving content metadata.
- Updated data schemas to include `contentMetadataMap` for messages, enabling multi-agent and parallel execution scenarios.

* refactor: update @librechat/agents dependency to version 3.0.56

* refactor: remove unused EPHEMERAL_AGENT_ID constant and simplify agent ID check

* refactor: enhance multi-agent message processing and primary agent determination

* refactor: implement branch message functionality for parallel responses

* refactor: integrate added conversation retrieval into message editing and regeneration processes

* refactor: remove unused isCard and isMultiMessage props from MessageRender and ContentRender components

* refactor: update @librechat/agents dependency to version 3.0.60

* refactor: replace usage of EPHEMERAL_AGENT_ID constant with isEphemeralAgentId function for improved clarity and consistency

* refactor: standardize agent ID format in tests for consistency

* chore: move addedConvo property to the correct position in payload construction

* refactor: rename agent_id values in loadAgent tests for clarity

* chore: reorder props in ContentParts component for improved readability

* refactor: rename variable 'content' to 'result' for clarity in RedisJobStore tests

* refactor: streamline useMessageActions by removing duplicate handleFeedback assignment

* chore: revert placeholder rendering logic MessageRender and ContentRender components to original

* refactor: implement useContentMetadata hook for optimized content metadata handling

* refactor: remove contentMetadataMap and related logic from the codebase and revert back to agentId/groupId in content parts

- Eliminated contentMetadataMap from various components and services, simplifying the handling of message content.
- Updated functions to directly access agentId and groupId from content parts instead of relying on a separate metadata map.
- Adjusted related hooks and components to reflect the removal of contentMetadataMap, ensuring consistent handling of message content.
- Updated tests and documentation to align with the new structure of message content handling.

* refactor: remove logging from groupParallelContent function to clean up output

* refactor: remove model parameter from TBranchMessageRequest type for simplification

* refactor: enhance branch message creation by stripping metadata for standalone content

* chore: streamline branch message creation by simplifying content filtering and removing unnecessary metadata checks

* refactor: include attachments in branch message creation for improved content handling

* refactor: streamline agent content processing by consolidating primary agent identification and filtering logic

* refactor: simplify multi-agent message processing by creating a dedicated mapping method and enhancing content filtering

* refactor: remove unused parameter from loadEphemeralAgent function for cleaner code

* refactor: update groupId handling in metadata to only set when provided by the server

api/models/Agent.js

@@ -1,8 +1,18 @@
 const mongoose = require('mongoose');
 const crypto = require('node:crypto');
 const { logger } = require('@librechat/data-schemas');
-const { ResourceType, SystemRoles, Tools, actionDelimiter } = require('librechat-data-provider');
-const { GLOBAL_PROJECT_NAME, EPHEMERAL_AGENT_ID, mcp_all, mcp_delimiter } =
+const { getCustomEndpointConfig } = require('@librechat/api');
+const {
+  Tools,
+  SystemRoles,
+  ResourceType,
+  actionDelimiter,
+  isAgentsEndpoint,
+  getResponseSender,
+  isEphemeralAgentId,
+  encodeEphemeralAgentId,
+} = require('librechat-data-provider');
+const { GLOBAL_PROJECT_NAME, mcp_all, mcp_delimiter } =
   require('librechat-data-provider').Constants;
 const {
   removeAgentFromAllProjects,
@@ -92,7 +102,7 @@ const getAgents = async (searchParameter) => await Agent.find(searchParameter).l
  * @param {import('@librechat/agents').ClientOptions} [params.model_parameters]
  * @returns {Promise<Agent|null>} The agent document as a plain object, or null if not found.
  */
-const loadEphemeralAgent = async ({ req, spec, agent_id, endpoint, model_parameters: _m }) => {
+const loadEphemeralAgent = async ({ req, spec, endpoint, model_parameters: _m }) => {
   const { model, ...model_parameters } = _m;
   const modelSpecs = req.config?.modelSpecs?.list;
   /** @type {TModelSpec | null} */
@@ -139,8 +149,28 @@ const loadEphemeralAgent = async ({ req, spec, agent_id, endpoint, model_paramet
   }
 
   const instructions = req.body.promptPrefix;
+
+  // Compute display name using getResponseSender (same logic used for addedConvo agents)
+  const appConfig = req.config;
+  let endpointConfig = appConfig?.endpoints?.[endpoint];
+  if (!isAgentsEndpoint(endpoint) && !endpointConfig) {
+    try {
+      endpointConfig = getCustomEndpointConfig({ endpoint, appConfig });
+    } catch (err) {
+      logger.error('[loadEphemeralAgent] Error getting custom endpoint config', err);
+    }
+  }
+
+  const sender = getResponseSender({
+    modelLabel: model_parameters?.modelLabel,
+    modelDisplayLabel: endpointConfig?.modelDisplayLabel,
+  });
+
+  // Encode ephemeral agent ID with endpoint, model, and computed sender for display
+  const ephemeralId = encodeEphemeralAgentId({ endpoint, model, sender });
+
   const result = {
-    id: agent_id,
+    id: ephemeralId,
     instructions,
     provider: endpoint,
     model_parameters,
@@ -169,8 +199,8 @@ const loadAgent = async ({ req, spec, agent_id, endpoint, model_parameters }) =>
   if (!agent_id) {
     return null;
   }
-  if (agent_id === EPHEMERAL_AGENT_ID) {
-    return await loadEphemeralAgent({ req, spec, agent_id, endpoint, model_parameters });
+  if (isEphemeralAgentId(agent_id)) {
+    return await loadEphemeralAgent({ req, spec, endpoint, model_parameters });
   }
   const agent = await getAgent({
     id: agent_id,