fix: validation error messages hidden by generic fallback in ErrorHandler::userMessage

ErrorHandler::userMessage only handled RuntimeException, but all validation
throws in ThesisCreateController and ThesisEditController use plain Exception.
This caused user-friendly messages like 'Le champ Nom/Prénom/Pseudo est requis'
to fall through to the 'Une erreur inattendue est survenue…' generic message.

Fix: add Exception check (after PDOException, since PDOException extends it)
so all validation exceptions pass their message through.

TODO.md

@@ -41,6 +41,8 @@
 - [x] **Migration idempotency** — `CREATE INDEX` / `CREATE TRIGGER` / `CREATE VIEW` now use `IF NOT EXISTS` in schema.sql and generate-schema.py; migrate.sh no longer fails on re-run
 - [ ] **Database readonly** — intermittent permission issue after deploy (added deploy-nginx recipe; permissions should be fixed by --chown + deploy-server.sh)
 - [x] **Upload progress bar not visible** — `collectFileNames()` now also checks FilePond instances directly (not just `input.files`); `upload-progress.php` no longer requires admin auth (blocked partage form polling)
+- [x] **Validation error messages hidden by generic fallback** — `ErrorHandler::userMessage` doesn't handle plain `Exception`, so all `throw new Exception(...)` validation messages fall through to "Une erreur inattendue…". Fix: add `Exception` pass-through before the generic fallback.
+- [x] **Validation messages use wrong field names** — "Nom/Prénom/Pseudo" → "Auteur·ice(s)", "Titre du mémoire" → "Titre du TFE" to match form labels. Updated autofocusFieldForError in both controllers.
 
 ## PeerTube Alternate Labels & FilePond Pools