✨ feat: Agent Panel UI Enhancements (#7800)

* feat: add MCP Panel to Agent Builder

- Add MCP server panel and configuration UI
- Implement MCP input forms and tool lists
- Add MCP icon and metadata support
- Integrate MCP with agent configuration
- Add localization support for MCP features
- Refactor components for better reusability
- Update types and add MCP-related mutations
- Fix small issues with Actions and AgentSelect
- Refactor AgentPanelSwitch and related components to use new
  AgentPanelContext to reduce prop drilling

* chore: import order

* chore: clean up import statements and unused var in ActionsPanel component

* refactor: AgentPanelContext with actions query, remove unnecessary `actions` state

- Added actions query using `useGetActionsQuery` to fetch actions based on the current agent ID.
- Removed now unused `setActions` state and related logic from `AgentPanelContext` and `AgentPanelSwitch` components.
- Updated `AgentPanelContextType` to reflect the removal of `setActions`.

* chore: re-order import statements in AgentConfig component

* chore: re-order import statements in ModelPanel component

* chore: update ModelPanel props to consolidated props to avoid passing unnecessary props

* chore: update import statements in Providers index file to include ToastProvider and AgentPanelContext exports

* chore: clean up import statements in VersionPanel component

* refactor: streamline AgentConfig and AgentPanel components

- Consolidated props in AgentConfig to only include necessary fields.
- Updated AgentPanel to remove unused state and props, enhancing clarity and maintainability.
- Reorganized import statements for better structure and readability.

* refactor: replace default agent form values with utility function

- Updated AgentsProvider, AgentPanel, AgentSelect, and DeleteButton components to use getDefaultAgentFormValues utility function instead of directly importing defaultAgentFormValues.
- Enhanced the initialization of agent forms by incorporating localStorage values for model and provider in the new utility function.

* chore: comment out rendering MCPSection

---------

Co-authored-by: Dustin Healy <54083382+dustinhealy@users.noreply.github.com>

client/src/locales/en/translation.json

@@ -1005,5 +1005,27 @@
   "com_ui_yes": "Yes",
   "com_ui_zoom": "Zoom",
   "com_user_message": "You",
-  "com_warning_resubmit_unsupported": "Resubmitting the AI message is not supported for this endpoint."
+  "com_warning_resubmit_unsupported": "Resubmitting the AI message is not supported for this endpoint.",
+    "com_ui_add_mcp": "Add MCP",
+  "com_ui_add_mcp_server": "Add MCP Server",
+  "com_ui_edit_mcp_server": "Edit MCP Server",
+  "com_agents_mcps_disabled": "You need to create an agent before adding MCPs.",
+  "com_ui_delete_mcp": "Delete MCP",
+  "com_ui_delete_mcp_confirm": "Are you sure you want to delete this MCP server?",
+  "com_ui_delete_mcp_success": "MCP server deleted successfully",
+  "com_ui_delete_mcp_error": "Failed to delete MCP server",
+  "com_agents_mcp_info": "Add MCP servers to your agent to enable it to perform tasks and interact with external services",
+  "com_ui_update_mcp_error": "There was an error creating or updating the MCP.",
+  "com_ui_update_mcp_success": "Successfully created or updated MCP",
+  "com_ui_available_tools": "Available Tools",
+  "com_ui_select_all": "Select All",
+  "com_ui_deselect_all": "Deselect All",
+  "com_agents_mcp_name_placeholder": "Custom Tool",
+  "com_ui_optional": "(optional)",
+  "com_agents_mcp_description_placeholder": "Explain what it does in a few words",
+  "com_ui_mcp_url": "MCP Server URL",
+  "com_ui_trust_app": "I trust this application",
+  "com_agents_mcp_trust_subtext": "Custom connectors are not verified by LibreChat",
+  "com_ui_icon": "Icon",
+  "com_agents_mcp_icon_size": "Minimum size 128 x 128 px"
 }