🗓️ feat: Add Special Variables for Prompts & Agents, Prompt UI Improvements (#7123)

* wip: Add Instructions component for agent configuration

* ✨ feat: Implement DropdownPopup for variable insertion in instructions

* refactor: Enhance variable handling by exporting specialVariables and updating Markdown components

* feat: Add special variable support for current date and user in Instructions component

* refactor: Update handleAddVariable to include localized label

* feat: replace special variables in instructions presets

* chore: update parameter type for user in getListAgents function

* refactor: integrate dayjs for date handling and move replaceSpecialVars function to data-provider

* feat: enhance replaceSpecialVars to include day number in current date format

* feat: integrate replaceSpecialVars for processing agent instructions

* feat: add support for current date & time in replaceSpecialVars function

* feat: add iso_datetime support in replaceSpecialVars function

* fix: enforce text parameter to be a required field in replaceSpecialVars function

* feat: add ISO datetime support in translation file

* fix: disable eslint warning for autoFocus in TextareaAutosize component

* feat: add VariablesDropdown component and integrate it into CreatePromptForm and PromptEditor; update translation for special variables

* fix: CategorySelector and related localizations

* fix: add z-index class to LanguageSTTDropdown for proper stacking context

* fix: add max-height and overflow styles to OGDialogContent in VariableDialog and PreviewPrompt components

* fix: update variable detection logic to exclude special variables and improve regex matching

* fix: improve accessibility text for actions menu in ChatGroupItem component

* fix: adjust max-width and height styles for dialog components and improve markdown rendering for light vs. dark, height/widths, etc.

* fix: remove commented-out code for better readability in PromptVariableGfm component

* fix: handle undefined input parameter in setParams function call

* fix: update variable label types to use TSpecialVarLabel for consistency

* fix: remove outdated information from special variables description in translation file

* fix: enhance unused i18next keys detection for special variable keys

* fix: update color classes for consistency/a11y in category and prompt variable components

* fix: update PromptVariableGfm component and special variable styles for consistency

* fix: improve variable highlighting logic in VariableForm component

* fix: update background color classes for consistency in VariableForm component

* fix: add missing ref parameter to Dialog component in OriginalDialog

* refactor: move navigate call for new conversation to after setConversation update

* refactor: move message query hook to client workspace; fix: handle edge case for navigation from finalHandler creating race condition for response message DB save

* chore: bump librechat-data-provider to 0.7.793

* ci: add unit tests for replaceSpecialVars function

* fix: implement getToolkitKey function for image_gen_oai toolkit filtering/including

* ci: enhance dayjs mock for consistent date/time values in tests

* fix: MCP stdio server fail to start when passing env property

* fix: use optional chaining for clientRef dereferencing in AskController and EditController
feat: add context to saveMessage call in streamResponse utility

* fix: only save error messages if the userMessageId was initialized

* refactor: add isNotAppendable check to disable inputs in ChatForm and useTextarea

* feat: enhance error handling in useEventHandlers and update conversation state in useNewConvo

* refactor: prepend underscore to conversationId in newConversation template

* feat: log aborted conversations with minimal messages and use consistent conversationId generation

---------

Co-authored-by: Olivier Schiavo <olivier.schiavo@wengo.com>
Co-authored-by: aka012 <aka012@neowiz.com>
Co-authored-by: jiasheng <jiashengguo@outlook.com>

client/src/components/Prompts/PromptEditor.tsx

@@ -12,6 +12,7 @@ import ReactMarkdown from 'react-markdown';
 import { codeNoExecution } from '~/components/Chat/Messages/Content/Markdown';
 import AlwaysMakeProd from '~/components/Prompts/Groups/AlwaysMakeProd';
 import { SaveIcon, CrossIcon } from '~/components/svg';
+import VariablesDropdown from './VariablesDropdown';
 import { TextareaAutosize } from '~/components/ui';
 import { PromptVariableGfm } from './Markdown';
 import { PromptsEditorMode } from '~/common';
@@ -59,10 +60,11 @@ const PromptEditor: React.FC<Props> = ({ name, isEditing, setIsEditing }) => {
         <span className="max-w-[200px] truncate sm:max-w-none">
           {localize('com_ui_prompt_text')}
         </span>
-        <div className="flex flex-shrink-0 flex-row gap-3 sm:gap-6">
+        <div className="flex flex-shrink-0 flex-row items-center gap-3 sm:gap-6">
           {editorMode === PromptsEditorMode.ADVANCED && (
             <AlwaysMakeProd className="hidden sm:flex" />
           )}
+          <VariablesDropdown fieldName={name} />
           <button
             type="button"
             onClick={() => setIsEditing((prev) => !prev)}
@@ -105,6 +107,7 @@ const PromptEditor: React.FC<Props> = ({ name, isEditing, setIsEditing }) => {
             isEditing ? (
               <TextareaAutosize
                 {...field}
+                // eslint-disable-next-line jsx-a11y/no-autofocus
                 autoFocus
                 className="w-full resize-none overflow-y-auto rounded bg-transparent text-sm text-text-primary focus:outline-none sm:text-base"
                 minRows={3}
@@ -123,8 +126,8 @@ const PromptEditor: React.FC<Props> = ({ name, isEditing, setIsEditing }) => {
                 style={{ minHeight: '4.5em', maxHeight: '21em', overflow: 'auto' }}
               >
                 <ReactMarkdown
-                  /** @ts-ignore */
                   remarkPlugins={[
+                    /** @ts-ignore */
                     supersub,
                     remarkGfm,
                     [remarkMath, { singleDollarTextMath: true }],