fix(01-code-splitting): convert PodcastMaker, ProductMarketing, Research, Scheduler, SEO, shared MUI icons

- Converted barrel imports to individual imports across 44 files
- Covers CreateStep, ScriptEditor, RenderQueue, ProductMarketing, Scheduler, SEO, shared components

frontend/src/components/shared/CopilotKitDegradedBanner.tsx

@@ -1,6 +1,7 @@
 import React, { useState } from 'react';
 import { Alert, AlertTitle, IconButton, Collapse } from '@mui/material';
-import { Close as CloseIcon, Warning as WarningIcon } from '@mui/icons-material';
+import CloseIcon from '@mui/icons-material/Close';
+import WarningIcon from '@mui/icons-material/Warning';
 import { useCopilotKitHealth } from '../../hooks/useCopilotKitHealth';
 
 interface CopilotKitDegradedBannerProps {