Merge S4-10: mark scheme editor + SpecPoint picker

- Add /exam-marker/:templateId/marks route with MarkSchemePage
- Per-Part mark scheme editor: points/levels/parts/checklist/free forms
- SpecPoint picker via GET /api/exam/specs/{spec_code}/points (falls back to manual spec_ref when endpoint 404s)
- Manual neo4j-sync button; ASSESSES edge verified in cc.public.exams
- Edit marks button on each template card in dashboard
- Merge-resolved: AppRoutes, index.ts, exam.types.ts, ExamDashboardPage (kept grouped UI + added Edit marks button)

Co-Authored-By: Claude Sonnet 4.6 <[email protected]>

src/pages/exam/ExamDashboardPage.tsx

@@ -24,6 +24,7 @@ import ArchiveIcon from '@mui/icons-material/Archive';
 import AssignmentIcon from '@mui/icons-material/Assignment';
 import ContentCopyIcon from '@mui/icons-material/ContentCopy';
 import EditIcon from '@mui/icons-material/Edit';
+import GradingIcon from '@mui/icons-material/Grading';
 
 import { useAuth } from '../../contexts/AuthContext';
 import { examRepository } from '../../services/exam/examRepository';
@@ -320,6 +321,16 @@ const ExamDashboardPage: React.FC = () => {
                               Updated {new Date(t.updated_at).toLocaleDateString()}
                             </Typography>
                           </Box>
+                          <Stack direction="row" spacing={1} sx={{ pt: 0.5 }}>
+                            <Button
+                              size="small"
+                              variant="outlined"
+                              onClick={(e) => { e.stopPropagation(); navigate(`/exam-marker/${t.id}/marks`); }}
+                              startIcon={<GradingIcon fontSize="small" />}
+                            >
+                              Edit marks
+                            </Button>
+                          </Stack>
                         </Paper>
                       </Grid>
                     );