feat: add collapsible sections to StepGenerate component with reusable CollapsibleSection

apps/admin/src/components/steps/CollapsibleSection.tsx

@@ -0,0 +1,44 @@
+import { Box, Collapse, IconButton, Stack, Typography, type SxProps, type Theme } from '@mui/material';
+import ExpandMore from '@mui/icons-material/ExpandMore';
+import { useState, type PropsWithChildren } from 'react';
+
+export default function CollapsibleSection({ title, defaultCollapsed = true, right, sx, children }: PropsWithChildren<{
+  title: string;
+  defaultCollapsed?: boolean;
+  right?: React.ReactNode;
+  sx?: SxProps<Theme>;
+}>) {
+  const [open, setOpen] = useState(!defaultCollapsed);
+
+  return (
+    <Box sx={{ border: '1px solid', borderColor: 'divider', borderRadius: 1, overflow: 'hidden', ...sx }}>
+      <Stack
+        direction="row"
+        alignItems="center"
+        justifyContent="space-between"
+        sx={{ px: 1.25, py: 0.75, cursor: 'pointer', bgcolor: 'background.paper' }}
+        onClick={() => setOpen(v => !v)}
+      >
+        <Stack direction="row" alignItems="center" spacing={1}>
+          <IconButton
+            size="small"
+            onClick={(e) => {
+              e.stopPropagation();
+              setOpen(v => !v);
+            }}
+            sx={{ transform: open ? 'rotate(180deg)' : 'rotate(0deg)', transition: 'transform 150ms ease' }}
+          >
+            <ExpandMore fontSize="small" />
+          </IconButton>
+          <Typography variant="subtitle2">{title}</Typography>
+        </Stack>
+        {right}
+      </Stack>
+      <Collapse in={open} timeout="auto" unmountOnExit={false}>
+        <Box sx={{ p: 1.25 }}>
+          {children}
+        </Box>
+      </Collapse>
+    </Box>
+  );
+}

apps/admin/src/components/steps/SelectedImages.tsx

@@ -8,8 +8,6 @@ export default function SelectedImages({
   onRemove: (key: string) => void;
 }) {
   return (
-    <Box>
-      <Typography variant="subtitle2" sx={{ mb: 1 }}>Selected Images</Typography>
     <Box sx={{ display: 'grid', gridTemplateColumns: 'repeat(auto-fill, minmax(120px, 1fr))', gap: 1 }}>
       {imageKeys.map((k) => (
         <Box key={k} sx={{ p: 1, border: '1px solid', borderColor: 'divider', borderRadius: 1, textAlign: 'center', bgcolor: '#fafafa' }}>
@@ -21,6 +19,5 @@ export default function SelectedImages({
         <Typography variant="body2" sx={{ color: 'text.secondary' }}>(No images selected)</Typography>
       )}
     </Box>
-    </Box>
   );
 }

apps/admin/src/components/steps/StepGenerate.tsx

@@ -1,6 +1,7 @@
 import { Box, Stack, TextField, Typography } from '@mui/material';
 import MediaLibrary from '../MediaLibrary';
 import SelectedImages from './SelectedImages';
+import CollapsibleSection from './CollapsibleSection';
 import type { Clip } from './StepAssets';
 
 export default function StepGenerate({
@@ -24,8 +25,7 @@ export default function StepGenerate({
       </Typography>
 
       {/* Audio transcriptions in order */}
-      <Box>
-        <Typography variant="subtitle2" sx={{ mb: 1 }}>Audio Transcriptions</Typography>
+      <CollapsibleSection title="Audio Transcriptions">
         <Stack spacing={1}>
           {[...postClips]
             .sort((a, b) => new Date(a.createdAt).getTime() - new Date(b.createdAt).getTime())
@@ -39,17 +39,20 @@ export default function StepGenerate({
             <Typography variant="body2" sx={{ color: 'text.secondary' }}>(No audio clips)</Typography>
           )}
         </Stack>
-      </Box>
+      </CollapsibleSection>
 
       {/* Selected images */}
+      <CollapsibleSection title="Selected Images">
         <SelectedImages imageKeys={genImageKeys} onRemove={onToggleGenImage} />
+      </CollapsibleSection>
 
       {/* Media library */}
+      <CollapsibleSection title="Media Library">
         <MediaLibrary selectionMode selectedKeys={genImageKeys} onToggleSelect={onToggleGenImage} />
+      </CollapsibleSection>
 
       {/* Prompt */}
-      <Box>
-        <Typography variant="subtitle2" sx={{ mb: 1 }}>AI Prompt</Typography>
+      <CollapsibleSection title="AI Prompt">
         <TextField
           label="Instructions + context for AI generation"
           value={promptText}
@@ -58,7 +61,7 @@ export default function StepGenerate({
           multiline
           minRows={4}
         />
-      </Box>
+      </CollapsibleSection>
     </Box>
   );
 }