inventory: barcode scanner in Add-item dialog

Add a camera barcode/QR scanner (components/scan/barcode-scanner.tsx,
@zxing/browser lazy-loaded) and a Barcode/NDC field to the pharmacy
Add-item dialog. Scanning a GS1 DataMatrix auto-fills expiry (AI 17) and
lot (AI 10 -> notes), with the GTIN (AI 01) as the barcode; plain 1D
barcodes drop straight into the field. Persists a nullable inventory
barcode column (migration 0036) through the type/validation/service, and
surfaces it on the item detail. i18n added to all locales.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

backend/drizzle/0036_aspiring_expediter.sql

@@ -0,0 +1 @@
+ALTER TABLE "inventory" ADD COLUMN "barcode" text;

backend/drizzle/meta/_journal.json

@@ -253,6 +253,13 @@
       "when": 1783530491321,
       "tag": "0035_slippery_retro_girl",
       "breakpoints": true
+    },
+    {
+      "idx": 36,
+      "version": "7",
+      "when": 1784406410448,
+      "tag": "0036_aspiring_expediter",
+      "breakpoints": true
     }
   ]
 }

backend/src/db/schema/inventory.ts

@@ -29,6 +29,8 @@ export const inventory = pgTable(
     stockQuantity: integer("stock_quantity").notNull().default(0),
     reorderThreshold: integer("reorder_threshold").notNull().default(0),
     location: text("location").notNull().default(""),
+    // Scanned medication barcode / NDC (GTIN when read from a GS1 DataMatrix).
+    barcode: text("barcode"),
     expiresAt: date("expires_at"),
     notes: text("notes"),
     createdBy: text("created_by").references(() => user.id, {

backend/src/lib/inventory-validation.ts

@@ -13,6 +13,7 @@ export const inventoryInputSchema = z.object({
   stockQuantity: z.number().int().min(0).max(1_000_000).default(0),
   reorderThreshold: z.number().int().min(0).max(1_000_000).default(0),
   location: z.string().trim().max(200).default(""),
+  barcode: z.string().trim().max(120).nullish(),
   expiresAt: z
     .string()
     .regex(/^\d{4}-\d{2}-\d{2}$/, "Date must be YYYY-MM-DD.")

backend/src/services/inventory.ts

@@ -21,6 +21,7 @@ function toInventoryItem(row: InventoryRow): InventoryItem {
     stockQuantity: row.stockQuantity,
     reorderThreshold: row.reorderThreshold,
     location: row.location,
+    barcode: row.barcode,
     expiresAt: row.expiresAt,
     notes: row.notes,
     createdAt: row.createdAt.toISOString(),
@@ -38,6 +39,7 @@ function columns(orgId: string, input: InventoryInput, createdBy?: string) {
     stockQuantity: input.stockQuantity,
     reorderThreshold: input.reorderThreshold,
     location: input.location,
+    barcode: input.barcode ?? null,
     expiresAt: input.expiresAt ?? null,
     notes: input.notes ?? null,
     ...(createdBy ? { createdBy } : {}),

backend/src/types/inventory.ts

@@ -11,6 +11,7 @@ export type InventoryItem = {
   stockQuantity: number;
   reorderThreshold: number;
   location: string;
+  barcode: string | null;
   expiresAt: string | null; // YYYY-MM-DD
   notes: string | null;
   createdAt: string;