📛 feat: Chat Badges via Model Specs (#10272)

* refactor: remove `useChatContext` from `useSelectMention`, explicitly pass `conversation` object

* feat: ephemeral agents via model specs

* refactor: Sync Jotai state with ephemeral agent state, also when Ephemeral Agent has no MCP servers selected

* refactor: move `useUpdateEphemeralAgent` to store and clean up imports

* refactor: reorder imports and invalidate queries for mcpConnectionStatus in event handler

* refactor: replace useApplyModelSpecEffects with useApplyModelSpecAgents and update event handlers to use new agent template logic

* ci: update useMCPSelect test to verify mcpValues sync with empty ephemeralAgent.mcp

client/src/components/Chat/Input/ChatForm.tsx

@@ -220,6 +220,7 @@ const ChatForm = memo(({ index = 0 }: { index?: number }) => {
         <div className={cn('flex w-full items-center', isRTL && 'flex-row-reverse')}>
           {showPlusPopover && !isAssistantsEndpoint(endpoint) && (
             <Mention
+              conversation={conversation}
               setShowMentionPopover={setShowPlusPopover}
               newConversation={generateConversation}
               textAreaRef={textAreaRef}
@@ -230,6 +231,7 @@ const ChatForm = memo(({ index = 0 }: { index?: number }) => {
           )}
           {showMentionPopover && (
             <Mention
+              conversation={conversation}
               setShowMentionPopover={setShowMentionPopover}
               newConversation={newConversation}
               textAreaRef={textAreaRef}