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Counting bulk hardware (screws, nails) by hand is slow. This adds a workflow
to estimate the count from weight instead: weigh one item, weigh the lot, and
the count is filled in automatically.
- The Fields modal gains a "Count by Weight" button that adds two quantity
fields, Unit Weight and Total Weight (default grams), and tags the Count
field as computed. An existing `count` field is linked in place rather than
duplicated, so hand-counted items keep their values.
- The link is plain metadata on the Count field
(`compute: {kind: 'count_by_weight', total, unit}`), so it round-trips
through the config/API with no backend change (covered by a backend test).
- During item entry, Count = round(Total Weight / Unit Weight), converting
mismatched units first (g/kg/oz) and refusing to divide when only one side
has a unit. It rounds to a whole number (no 403.7 nails).
- When a weight changes, the count always reflects the new reality: it is set
to the computed value (0 for a sub-unit total) when both weights are present,
or cleared when they can't produce one (a weight blanked, incompatible
units) — so a stale count can never persist against edited weights. A
hand-typed count is only touched when a weight actually changes.
countByWeight lives in units.js; the field preset, config detection, and the
entry-time apply hook live in a new computeFields.js. Covered by unit tests
(countByWeight, computeFields), InventoryTable auto-fill / clear / sub-unit on
draft and inline edit, the FieldSchemaEditor preset, and a backend
field-metadata round-trip.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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