SummaryStep: fix share button position + save button visibility

- Share this plan: right-aligned below divider, clear spacing before content
- Save and continue later: outlined button, full width, under confirm CTA

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/components/pages/SummaryStep/SummaryStep.tsx

@@ -308,34 +308,27 @@ export const SummaryStep: React.FC<SummaryStepProps> = ({
         Review your plan
       </Typography>
 
-      <Box
+      <Typography variant="body1" color="text.secondary" sx={{ mb: 3 }}>
-        sx={{
-          display: 'flex',
-          justifyContent: 'space-between',
-          alignItems: 'center',
-          mb: 3,
-        }}
-      >
-        <Typography variant="body1" color="text.secondary">
         {isPrePlanning
           ? "Here's an overview of your plan. You can make changes at any time."
           : 'Please review your selections below. You can edit any section before confirming.'}
       </Typography>
+
+      <Divider sx={{ mb: 2 }} />
+
       {onShareByEmail && (
+        <Box sx={{ display: 'flex', justifyContent: 'flex-end', mb: 4 }}>
           <Button
             variant="outlined"
             color="secondary"
             size="small"
             startIcon={<ForwardToInboxOutlinedIcon />}
             onClick={() => setShareOpen(true)}
-            sx={{ ml: 2, whiteSpace: 'nowrap', flexShrink: 0 }}
           >
             Share this plan
           </Button>
-        )}
         </Box>
-
+      )}
-      <Divider sx={{ mb: 4 }} />
 
       {/* ─── Arrangement details ─── */}
       {arrangementDetails && (
@@ -716,7 +709,14 @@ export const SummaryStep: React.FC<SummaryStepProps> = ({
       </Button>
 
       {onSaveAndExit && (
-        <Button variant="text" color="secondary" fullWidth onClick={onSaveAndExit} sx={{ mt: 1 }}>
+        <Button
+          variant="outlined"
+          color="secondary"
+          size="large"
+          fullWidth
+          onClick={onSaveAndExit}
+          sx={{ mt: 1.5 }}
+        >
           Save and continue later
         </Button>
       )}