* 🐛 Fix legacy path migrations on content without coordinates
PRE still returned 500 on get-team-shared-files after #12357, now with
"expected rect instance" in legacy-6. When a path has no points, legacy-6
rebuilds its rect from the content, but content whose points are not
numbers (NaN or infinite coordinates, segments without params, only a
close path) gives no rect either, and rect->points rejects nil.
Fall back to the empty rect in legacy-6. A path with segments missing
coordinates then failed later, in 0003-convert-path-content-v2, since the
binary path data can not store them; drop those segments there.
Relates to #12343
AI-assisted-by: claude-opus-5-5
* 🐛 Skip shared files that fail to load in get-team-shared-files
get-team-shared-files loads and migrates every shared file of the team,
so one file whose migration fails made the whole request return 500 and
the "Add library" modal could not open.
Catch the error per file, log it with the file and team ids, and leave
that file out of the list. The other libraries still show, and the error
report names the broken file.
Closes#12343
AI-assisted-by: claude-opus-5-5
d8862c759b