Bambu printer SD cards are FAT32/exFAT, which forbids < > : " / \ | ? *
plus control chars and trailing dots/spaces. Library rename only blocked
path separators, so a name like L|R.3mf was accepted and only failed
later at FTP upload with 553 Could not create file - far from the rename
action that caused it. Bambu Studio refuses these names in its save
dialog; Bambuddy now does the same.
New backend/app/utils/filename.py centralises validation. Wired into
update_file, upload_file, print_library_file, and queue add. Existing
rows with bad names are left alone (no silent rewrite of user data);
users get an actionable 400 pointing at rename.
Frontend rename modal mirrors the same set client-side with inline error.
New fileManager.invalidFilenameChar i18n key translated across all 9
locales. 26 new tests in test_filename_validation.py.
maziggy
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