Build inventory frontend and stock management features

- Full inventory UI: product list with search/filter, product detail with
  tabs (details, units, suppliers, stock receipts, price history)
- Product filters: category, type (serialized/rental/repair), low stock,
  active/inactive — all server-side with URL-synced state
- Product-supplier junction: link products to multiple suppliers with
  preferred flag, joined supplier details in UI
- Stock receipts: record incoming stock with supplier, qty, cost per unit,
  invoice number; auto-increments qty_on_hand for non-serialized products
- Price history tab on product detail page
- categories/all endpoint to avoid pagination limit on dropdown fetches
- categoryId filter on product list endpoint
- Repair parts and additional inventory items in music store seed data
- isDualUseRepair corrected: instruments set to false, strings/parts true
- Product-supplier links and stock receipts in seed data
- Price history seed data simulating cost increases over past year
- 37 API tests covering categories, suppliers, products, units,
  product-suppliers, and stock receipts
- alert-dialog and checkbox UI components
- sync-and-deploy.sh script for rsync + remote deploy

packages/admin/src/components/inventory/inventory-unit-form.tsx

@@ -0,0 +1,118 @@
+import { useForm } from 'react-hook-form'
+import { Button } from '@/components/ui/button'
+import { Input } from '@/components/ui/input'
+import { Label } from '@/components/ui/label'
+import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from '@/components/ui/select'
+import type { InventoryUnit, UnitCondition, UnitStatus } from '@/types/inventory'
+
+const CONDITIONS: { value: UnitCondition; label: string }[] = [
+  { value: 'new', label: 'New' },
+  { value: 'excellent', label: 'Excellent' },
+  { value: 'good', label: 'Good' },
+  { value: 'fair', label: 'Fair' },
+  { value: 'poor', label: 'Poor' },
+]
+
+const STATUSES: { value: UnitStatus; label: string }[] = [
+  { value: 'available', label: 'Available' },
+  { value: 'sold', label: 'Sold' },
+  { value: 'rented', label: 'Rented' },
+  { value: 'on_trial', label: 'On Trial' },
+  { value: 'in_repair', label: 'In Repair' },
+  { value: 'layaway', label: 'Layaway' },
+  { value: 'lost', label: 'Lost' },
+  { value: 'retired', label: 'Retired' },
+]
+
+interface Props {
+  defaultValues?: Partial<InventoryUnit>
+  onSubmit: (data: Record<string, unknown>) => void
+  loading?: boolean
+}
+
+export function InventoryUnitForm({ defaultValues, onSubmit, loading }: Props) {
+  const { register, handleSubmit, setValue, watch } = useForm({
+    defaultValues: {
+      serialNumber: defaultValues?.serialNumber ?? '',
+      condition: (defaultValues?.condition ?? 'new') as UnitCondition,
+      status: (defaultValues?.status ?? 'available') as UnitStatus,
+      purchaseDate: defaultValues?.purchaseDate ?? '',
+      purchaseCost: defaultValues?.purchaseCost ?? '',
+      notes: defaultValues?.notes ?? '',
+    },
+  })
+
+  const condition = watch('condition')
+  const status = watch('status')
+
+  function handleFormSubmit(data: Record<string, unknown>) {
+    onSubmit({
+      serialNumber: (data.serialNumber as string) || undefined,
+      condition: data.condition,
+      status: data.status,
+      purchaseDate: (data.purchaseDate as string) || undefined,
+      purchaseCost: (data.purchaseCost as string) || undefined,
+      notes: (data.notes as string) || undefined,
+    })
+  }
+
+  return (
+    <form onSubmit={handleSubmit(handleFormSubmit)} className="space-y-4">
+      <div className="space-y-2">
+        <Label htmlFor="unit-serial">Serial Number</Label>
+        <Input id="unit-serial" {...register('serialNumber')} placeholder="e.g. US22041234" />
+      </div>
+      <div className="grid grid-cols-2 gap-4">
+        <div className="space-y-2">
+          <Label>Condition</Label>
+          <Select value={condition} onValueChange={(v) => setValue('condition', v as UnitCondition)}>
+            <SelectTrigger>
+              <SelectValue />
+            </SelectTrigger>
+            <SelectContent>
+              {CONDITIONS.map((c) => (
+                <SelectItem key={c.value} value={c.value}>{c.label}</SelectItem>
+              ))}
+            </SelectContent>
+          </Select>
+        </div>
+        <div className="space-y-2">
+          <Label>Status</Label>
+          <Select value={status} onValueChange={(v) => setValue('status', v as UnitStatus)}>
+            <SelectTrigger>
+              <SelectValue />
+            </SelectTrigger>
+            <SelectContent>
+              {STATUSES.map((s) => (
+                <SelectItem key={s.value} value={s.value}>{s.label}</SelectItem>
+              ))}
+            </SelectContent>
+          </Select>
+        </div>
+      </div>
+      <div className="grid grid-cols-2 gap-4">
+        <div className="space-y-2">
+          <Label htmlFor="unit-date">Purchase Date</Label>
+          <Input id="unit-date" type="date" {...register('purchaseDate')} />
+        </div>
+        <div className="space-y-2">
+          <Label htmlFor="unit-cost">Purchase Cost</Label>
+          <Input id="unit-cost" type="number" step="0.01" min="0" {...register('purchaseCost')} placeholder="0.00" />
+        </div>
+      </div>
+      <div className="space-y-2">
+        <Label htmlFor="unit-notes">Notes</Label>
+        <textarea
+          id="unit-notes"
+          {...register('notes')}
+          rows={2}
+          placeholder="Any notes about this unit..."
+          className="w-full rounded-md border border-input bg-background px-3 py-2 text-sm ring-offset-background placeholder:text-muted-foreground focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring resize-none"
+        />
+      </div>
+      <Button type="submit" disabled={loading} className="w-full">
+        {loading ? 'Saving...' : defaultValues?.id ? 'Save Changes' : 'Add Unit'}
+      </Button>
+    </form>
+  )
+}