Remove quantity option from add/edit forms

Each discrete item (pre-roll, edible, etc.) is now always one
physical unit with its own asset ID. The quantity field is gone
from both add and edit flows, countOriginal is hardcoded to 1,
and price is just "Price" instead of "Price per unit."

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

web/src/components/modals/AddInventoryFlow.tsx

@@ -397,7 +397,6 @@ function InstanceDetailsStep({
     shopId: last?.shopId ?? data.shops[0]?.id ?? NEW_SHOP,
     binId: data.bins[0]?.id ?? NEW_BIN,
     weight: last?.weight ?? (isDiscrete ? 0 : 3.5),
-    countOriginal: last?.countOriginal ?? (isDiscrete ? 1 : 0),
     unitWeight: last?.unitWeight ?? (isDiscrete ? 0.7 : 0),
     price: initialPrice,
     thc: last?.thc ?? 22,
@@ -414,7 +413,6 @@ function InstanceDetailsStep({
   const update = <K extends keyof typeof form>(k: K, v: (typeof form)[K]) =>
     setForm((f) => ({ ...f, [k]: v }));
 
-  const totalPrice = isDiscrete ? form.price * form.countOriginal : form.price;
   const cpg = !isDiscrete && form.weight > 0 ? form.price / form.weight : 0;
   const assetIdValid = ASSET_ID_RE.test(assetId);
   const assetIdConflict =
@@ -447,9 +445,9 @@ function InstanceDetailsStep({
         shopId,
         binId,
         weight: isDiscrete ? undefined : form.weight,
-        countOriginal: isDiscrete ? form.countOriginal : undefined,
+        countOriginal: isDiscrete ? 1 : undefined,
         unitWeight: isDiscrete ? form.unitWeight : undefined,
-        price: totalPrice,
+        price: form.price,
         thc: form.thc,
         cbd: form.cbd,
         totalCannabinoids: form.totalCannabinoids,
@@ -608,24 +606,14 @@ function InstanceDetailsStep({
           }}
         >
           {isDiscrete ? (
-            <>
-              <Field label={`Quantity (${cfg!.unit})`}>
-                <Input
-                  type="number"
-                  step="1"
-                  value={form.countOriginal}
-                  onChange={(e) => update("countOriginal", +e.target.value)}
-                />
-              </Field>
-              <Field label="Per-unit weight (g)" hint="For grams stats">
-                <Input
-                  type="number"
-                  step="0.1"
-                  value={form.unitWeight}
-                  onChange={(e) => update("unitWeight", +e.target.value)}
-                />
-              </Field>
-            </>
+            <Field label="Unit weight (g)" span={2} hint="Weight of one unit — for grams stats">
+              <Input
+                type="number"
+                step="0.1"
+                value={form.unitWeight}
+                onChange={(e) => update("unitWeight", +e.target.value)}
+              />
+            </Field>
           ) : (
             <Field label={`Size (${cfg?.unit ?? "g"})`} span={2}>
               <Input
@@ -636,7 +624,7 @@ function InstanceDetailsStep({
               />
             </Field>
           )}
-          <Field label={isDiscrete ? "Price per unit ($)" : "Price ($)"}>
+          <Field label="Price ($)">
             <Input
               type="number"
               step="0.01"
@@ -661,17 +649,6 @@ function InstanceDetailsStep({
             </span>
           </div>
         )}
-        {isDiscrete && form.price > 0 && form.countOriginal > 0 && (
-          <div style={{ marginTop: 12, fontSize: 12, color: "var(--ink-3)" }}>
-            Total:{" "}
-            <span className="mono" style={{ color: "var(--ink-2)" }}>
-              {fmt.money(totalPrice)}
-            </span>
-            <span style={{ marginLeft: 6 }}>
-              ({form.countOriginal} × {fmt.money(form.price)})
-            </span>
-          </div>
-        )}
 
         <div
           className="smallcaps"