fix(cli): surface FS errors on prefs save failures - #3253
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Co-authored-by: Cursor <cursoragent@cursor.com>
Co-authored-by: Cursor <cursoragent@cursor.com>
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Hello, I stumbled across a case where I needed more detailed FS errors surfaced. The LittleFS partition was full but silently failing, even sometimes saying 'OK' when actually nothing was written.
This PR attempts to surface more error details when an FS operation fails.
ERR no space left on deviceERR prefs <stage> failed lfs=-NNERR prefs serialize failedStages:
open,write,rename,serialize,nospc.Stacked on #3254 (atomic saves) — merge that first, then rebase this onto
dev. The first commit here is #3254's.