Remove estimated remaining decay, use audit values directly

Replace burn-rate estimation (linear decay between audits) with actual
last audit values. Remaining is now always the last weigh-in value or
original weight if no audits exist — no more speculative daily decay.

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

web/src/components/ProductDetail.tsx

@@ -38,8 +38,8 @@ export function ProductDetail({
   const bin = data.bins.find((b) => b.id === item.binId);
   const cfg = TYPES.find((t) => t.id === item.type);
   const product = data.products.find((p) => p.id === item.productId);
-  const pctRemaining = helpers.pctRemaining(item, getToday(getStoredTimezone()));
-  const est = helpers.estimatedRemaining(item, getToday(getStoredTimezone()));
+  const pctRemaining = helpers.pctRemaining(item);
+  const rem = helpers.remaining(item);
   const last = helpers.lastAudit(item);
   const overdue = helpers.auditOverdue(item, getToday(getStoredTimezone()));
   const sinceCheck = helpers.daysSinceCheck(item, getToday(getStoredTimezone()));
@@ -293,12 +293,12 @@ export function ProductDetail({
                 }}
               >
                 <div className="smallcaps" style={{ color: "var(--ink-3)" }}>
-                  {item.kind === "discrete" ? "Units remaining" : "Estimated remaining"}
+                  {item.kind === "discrete" ? "Units remaining" : "Remaining"}
                 </div>
                 <div style={{ fontFamily: "var(--mono)", fontSize: 13 }}>
                   {item.kind === "discrete"
                     ? `${item.countLastAudit ?? item.countOriginal} of ${item.countOriginal}`
-                    : `${est.toFixed(2)} of ${item.weight} ${cfg?.unit ?? "g"}`}
+                    : `${rem.toFixed(2)} of ${item.weight} ${cfg?.unit ?? "g"}`}
                   <span style={{ color: "var(--ink-3)", marginLeft: 8 }}>
                     {Math.round(pctRemaining * 100)}%
                   </span>
@@ -327,8 +327,7 @@ export function ProductDetail({
                     fontStyle: "italic",
                   }}
                 >
-                  Estimated by linear decay since last {last.mode} on {fmt.dateShort(last.date, getStoredTimezone())} ({last.value.toFixed(2)}
-                  {cfg?.unit}). Re-audit to update.
+                  Last {last.mode} on {fmt.dateShort(last.date, getStoredTimezone())}
                 </div>
               )}
               {item.containerWeight != null && last && (
@@ -340,7 +339,7 @@ export function ProductDetail({
                     fontStyle: "italic",
                   }}
                 >
-                  Expected container total: {((item.containerWeight - item.weight) + est).toFixed(2)}g
+                  Expected container total: {((item.containerWeight - item.weight) + rem).toFixed(2)}g
                 </div>
               )}
             </div>