🚀 feat: Artifact Editing & Downloads (#5428)

* refactor: expand container

* chore: bump @codesandbox/sandpack-react to latest

* WIP: first pass, show editor

* feat: implement ArtifactCodeEditor and ArtifactTabs components for enhanced artifact management

* refactor: fileKey

* refactor: auto scrolling code editor and add messageId to artifact

* feat: first pass, editing artifact

* feat: first pass, robust artifact replacement

* fix: robust artifact replacement & re-render when expected

* feat: Download Artifacts

* refactor: improve artifact editing UX

* fix: layout shift of new download button

* fix: enhance missing output checks and logging in StreamRunManager

client/src/Providers/EditorContext.tsx

@@ -0,0 +1,29 @@
+import React, { createContext, useContext, useState } from 'react';
+
+interface EditorContextType {
+  isMutating: boolean;
+  setIsMutating: React.Dispatch<React.SetStateAction<boolean>>;
+  currentCode?: string;
+  setCurrentCode: React.Dispatch<React.SetStateAction<string | undefined>>;
+}
+
+const EditorContext = createContext<EditorContextType | undefined>(undefined);
+
+export function EditorProvider({ children }: { children: React.ReactNode }) {
+  const [isMutating, setIsMutating] = useState(false);
+  const [currentCode, setCurrentCode] = useState<string | undefined>();
+
+  return (
+    <EditorContext.Provider value={{ isMutating, setIsMutating, currentCode, setCurrentCode }}>
+      {children}
+    </EditorContext.Provider>
+  );
+}
+
+export function useEditorContext() {
+  const context = useContext(EditorContext);
+  if (context === undefined) {
+    throw new Error('useEditorContext must be used within an EditorProvider');
+  }
+  return context;
+}