v1.2.4

Patch release focused on non-technical first-run recovery.

• Adds clearer guidance when a --batch folder path is wrong.
• Adds step-by-step Evernote ENEX export instructions when a selected folder contains no .enex files.
• Keeps the safe dry-run workflow unchanged.

Verification:

• npm test: 448 tests, 441 passing, 0 failing, 7 skipped.
• npm pack --dry-run: 14 files, no private migration data.