Fix 18 UX issues: confirmations, undo, drawer nav, empty states, and polish

Comprehensive UX audit covering modals, drawers, dashboard, and inventory.
Key changes: confirmation steps before destructive actions, undo via toast
for consume/gone/checkout, back-navigation across entity drawers, optional
ratings, discrete item count field, audit progress bar, and sortable column
affordance.

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

server/src/routes/bootstrap.ts

@@ -34,6 +34,7 @@ type InventoryRow = {
   consumed_date: string | null;
   gone_date: string | null;
   checkout_date: string | null;
+  prev_bin_id: string | null;
   rating: number | null;
   notes: string | null;
 };
@@ -112,6 +113,7 @@ bootstrapRouter.get("/bootstrap", (_req, res) => {
     consumedDate: i.consumed_date,
     goneDate: i.gone_date,
     checkoutDate: i.checkout_date,
+    prevBinId: i.prev_bin_id,
     rating: i.rating,
     notes: i.notes,
     audits: (auditsByInventory.get(i.id) ?? []).map((a) => ({