centralise form fieldsets into shared partials; add TODO stubs in partage form

TODO.md

@@ -39,6 +39,14 @@
 - [x] Update `root` directive in `nginx/posterg.conf`
 - [x] Update `STORAGE_ROOT` production path in `app/bootstrap.php`
 
+## Centralise Form Templates
+
+- [x] Extract shared fieldset partials: `fieldset-tfe-info.php`, `fieldset-academic.php`, `fieldset-files.php`, `fieldset-metadata.php`, `fieldset-licence-explanation.php`
+- [x] Refactor `templates/admin/add.php` to use shared partials
+- [x] Refactor `templates/admin/edit.php` to use shared partials (with edit-mode callable adapters)
+- [x] Refactor `partage/index.php` `renderShareLinkForm()` to use shared partials
+- [x] Add TODO comments in `partage/index.php` for student-facing explanations (intro block, per-fieldset notes, email note)
+
 ## File Display in Forms & Recaps
 
 - [x] Add live file preview to `file-field.php` partial (`data-preview` attribute + `.file-preview-list` container)