Split audits into Weigh Ins (bulk) and Bin Checks (discrete)

Replaces the unified audit system with two purpose-built flows:
- Weigh Ins: rebranded audit flow for bulk products (Flower, Concentrate,
  Tincture) with scale weigh, container weigh, and estimate modes
- Bin Checks: new bin-level presence check — select a bin, scan every item,
  resolve discrepancies (wrong bin, unknown, missing), auto-records presence
  audits on verified items

Adds cadence_days and last_checked to bins table, with per-bin overdue
tracking on the dashboard and bins view.

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

web/src/types.ts

@@ -91,6 +91,8 @@ export interface Bin {
   id: string;
   name: string;
   capacity: number;
+  cadenceDays: number;
+  lastChecked: string | null;
 }
 
 export interface TypeConfig {
@@ -203,9 +205,15 @@ export const helpers = {
   auditOverdue(p: Item, today = TODAY_STR): boolean {
     if (p.status !== "active" && p.status !== "checked-out") return false;
     const cfg = TYPES.find((t) => t.id === p.type);
-    if (!cfg) return false;
+    if (!cfg || cfg.kind === "discrete") return false;
     return this.daysSinceCheck(p, today) >= cfg.cadenceDays;
   },
+  binCheckOverdue(bin: Bin, today = TODAY_STR): boolean {
+    return this.daysSinceBinCheck(bin, today) >= bin.cadenceDays;
+  },
+  daysSinceBinCheck(bin: Bin, today = TODAY_STR): number {
+    return this.daysSince(bin.lastChecked, today);
+  },
   remaining(p: Item): number {
     if (p.status !== "active" && p.status !== "checked-out") return 0;
     if (p.kind === "discrete") {