Improve recap page + fix CSV import for jury roles

recapitulatif.php (partage):
- Center .thanks-success and add bottom margin/padding
- Display ALL fields: identifier, synopsis, languages, formats,
  jury (all roles), baiu link, license, access type
- Add validation notice asking user to verify info, with
  xamxam@erg.be contact link (email obfuscated)

StudentEmail:
- Add 'Note contextuelle' and license_custom to email recap
- Rename 'Promoteur·ice(s)' to 'Promoteur·ice(s) interne'
- Change email message to ask student to verify info + contact
  for errors

CSV export/import:
- Add 3 new CSV columns: Lecteur·ice(s) interne,
  Lecteur·ice(s) externe, Promoteur·ice(s) ULB
- Export splits supervisors by role/is_external/is_ulb into
  separate columns
- Import inserts supervisors with correct role, is_external,
  and is_ulb flags (was: all treated as generic supervisors)
- Add header matching for short distinguishers (ulb, externe)
  via str_contains fallback

app/src/Database.php

@@ -2340,7 +2340,7 @@ class Database
     public function getAllThesisSupervisorsForExport(): array
     {
         return $this->pdo->query('
-            SELECT ts.thesis_id, s.name
+            SELECT ts.thesis_id, s.name, ts.role, ts.is_external, ts.is_ulb
             FROM thesis_supervisors ts
             JOIN supervisors s ON s.id = ts.supervisor_id
             ORDER BY ts.thesis_id, ts.supervisor_order