applySort() always read input_price_per_m for price sorting, but image
models carry cost_per_image instead — input_price_per_m is undefined on
them, so every image model got an effective price of 0 and the sort was a
no-op.
Fix: detect image models via cost_per_image !== undefined and use that
field when present; fall back to input_price_per_m for text models.
Files changed:
- assets/js/model-picker.js — applySort price branch
- prautoblogger.php — version bump 0.13.8 → 0.13.9
- CHANGELOG.md — release notes
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