rename() fails with EBUSY on Docker bind-mounted files. Add safeWriteFile()
helper that tries atomic rename first, falls back to direct write. Fixes
both init wizard and attach wizard fstab operations.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
New Settings wizard to attach drives with existing filesystems without
formatting. Mounts partition at staging path, lets user browse and pick
a subfolder, then bind-mounts it at /mnt/<name> with fstab entries.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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