New /dashboard/templates page (MANAGER/ADMIN, matches backend access):
lists document templates, lets MANAGER/ADMIN download the current
file and ADMIN replace it. Nav link added to the header. Also renamed
"Genera Attestato" to "Genera Certificato di Adesione" and the
downloaded file's name prefix to match, for consistency with the
document's real name.
Verified live: nav link navigates to the page, download round-trips
the file, and uploading a new file updates the listed filename and
timestamp immediately.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017hQcuUQFue2bFvrYw2UQhK
