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lib/files: path parts; names checked for rename and new folder; why something can't be renamed, moved or deleted (the Gemini cache, a file being written or a folder holding one, the firmware's top-level folders), and why it can't go into a folder; the viewer for a file by its name, with a sniff for text. FileList keeps a folder's entries packed, 256 at most, the first 256 by name whatever order the card lists them in, and sorts by name, date or size with folders first. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01EhqxQ49eCju4CzKYNjZzwT