refactor: unify FilePond edit previews + clean upload UI and shared fragments

* Move shared `fichiers-fragment.php` from `partage/` to `templates/partials/form/`
  and update all include/require references
* `.gitignore`: exclude SQLite WAL/SHM journal files
* FilePond UI:

  * change uploaded file block border state from yellow to green
  * restyle image previews to use site light-theme colors
* Edit mode:

  * remove custom existing-file preview list implementation
  * preload existing files directly into FilePond pools
  * include `cover` and `note_intention` assets in FilePond-managed state
* Remove obsolete upload progress bar UI and related JS includes
* Remove deprecated `Écriture` + `Image` format types from upload flow/configuration

.gitignore

@@ -5,23 +5,11 @@ compose.lock
 ### Test databases ###
 app/storage/test.db
 *.db
+*.db-wal
+*.db-shm
 app/.env
 
 ### Logs ###
-error.log
-app/storage/logs/*.log
-!app/storage/logs/.gitkeep
-app/storage/maintenance.flag
-app/storage/cache/*
-!app/storage/cache/.gitkeep
-app/storage/theses/*
-!app/storage/theses/.gitkeep
-app/storage/banners/*
-!app/storage/banners/.gitkeep
-app/storage/tmp/*
-!app/storage/tmp/.gitkeep
-app/storage/tmp/filepond/*
-!app/storage/tmp/filepond/.gitkeep
 
 # Nix
 .direnv/