Add container weight tracking for weigh-based concentrate audits

Record the total weight of a jar (product + container) at acquisition so
audits can be done by simply re-weighing the sealed jar. The tare is
derived (containerWeight − productWeight), and the audit flow offers a
"Weigh container" toggle that auto-calculates remaining product from the
scale reading.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

web/src/components/modals/BulkEditModal.tsx

@@ -1,6 +1,7 @@
 import { useState } from "react";
 import { useMutation, useQueryClient } from "@tanstack/react-query";
 import type { Bootstrap, Item } from "../../types.js";
+import { TYPES } from "../../types.js";
 import { api } from "../../api.js";
 import type { BatchOp } from "../../api.js";
 import { Btn, Field, Input, Select } from "../primitives/index.js";
@@ -26,8 +27,14 @@ export function BulkEditModal({
   const [cbd, setCbd] = useState("");
   const [totalCannabinoids, setTotalCannabinoids] = useState("");
   const [purchaseDate, setPurchaseDate] = useState("");
+  const [containerWeight, setContainerWeight] = useState("");
   const [error, setError] = useState<string | null>(null);
 
+  const hasBulkWeighable = items.some((i) => {
+    const cfg = TYPES.find((t) => t.id === i.type);
+    return i.kind === "bulk" && cfg?.weighable;
+  });
+
   const save = useMutation({
     mutationFn: () => {
       const fields: Record<string, string | number | null> = {};
@@ -38,6 +45,7 @@ export function BulkEditModal({
       if (cbd !== "") fields.cbd = parseFloat(cbd);
       if (totalCannabinoids !== "") fields.totalCannabinoids = parseFloat(totalCannabinoids);
       if (purchaseDate) fields.purchaseDate = purchaseDate;
+      if (containerWeight !== "") fields.containerWeight = parseFloat(containerWeight);
 
       if (Object.keys(fields).length === 0) {
         return Promise.reject(new Error("No fields to update — fill in at least one field."));
@@ -163,6 +171,20 @@ export function BulkEditModal({
             </Field>
           </div>
 
+          {hasBulkWeighable && (
+            <div style={{ display: "grid", gridTemplateColumns: "repeat(5, 1fr)", gap: 16, marginTop: 16 }}>
+              <Field label="Container weight (g)">
+                <Input
+                  type="number"
+                  step="0.01"
+                  placeholder="—"
+                  value={containerWeight}
+                  onChange={(e) => setContainerWeight(e.target.value)}
+                />
+              </Field>
+            </div>
+          )}
+
           {error && (
             <div style={{ marginTop: 14, fontSize: 12, color: "var(--terracotta)" }}>{error}</div>
           )}