feat(checkout): searchable address fields and Rajaongkir integration

Admin SPA:
- Changed billing/shipping state from Select to SearchableSelect

Customer SPA:
- Added cmdk package for command palette
- Created popover, command, and searchable-select UI components
- Added searchable country and state fields to checkout
- Fetches countries/states from /countries API
- Auto-clears state when country changes

Backend:
- Added generic woonoow/shipping/before_calculate hook
- Removed hardcoded Rajaongkir session handling

Documentation:
- Updated RAJAONGKIR_INTEGRATION.md with:
  - Complete searchable destination selector plugin code
  - JavaScript implementation
  - React component version
  - REST API endpoint for destination search

customer-spa/src/components/ui/command.tsx

@@ -0,0 +1,107 @@
+"use client"
+
+import * as React from "react"
+import { Command as CommandPrimitive } from "cmdk"
+import { Search } from "lucide-react"
+import { cn } from "@/lib/utils"
+
+const Command = React.forwardRef<
+    React.ElementRef<typeof CommandPrimitive>,
+    React.ComponentPropsWithoutRef<typeof CommandPrimitive>
+>(({ className, ...props }, ref) => (
+    <CommandPrimitive
+        ref={ref}
+        className={cn(
+            "flex h-full w-full flex-col overflow-hidden rounded-md bg-white text-gray-900",
+            className
+        )}
+        {...props}
+    />
+))
+Command.displayName = CommandPrimitive.displayName
+
+const CommandInput = React.forwardRef<
+    React.ElementRef<typeof CommandPrimitive.Input>,
+    React.ComponentPropsWithoutRef<typeof CommandPrimitive.Input>
+>(({ className, ...props }, ref) => (
+    <div className="flex items-center border-b px-3" cmdk-input-wrapper="">
+        <Search className="mr-2 h-4 w-4 shrink-0 opacity-50" />
+        <CommandPrimitive.Input
+            ref={ref}
+            className={cn(
+                "flex h-10 w-full rounded-md bg-transparent py-3 text-sm outline-none placeholder:text-gray-400 disabled:cursor-not-allowed disabled:opacity-50 border-none",
+                className
+            )}
+            {...props}
+        />
+    </div>
+))
+
+CommandInput.displayName = CommandPrimitive.Input.displayName
+
+const CommandList = React.forwardRef<
+    React.ElementRef<typeof CommandPrimitive.List>,
+    React.ComponentPropsWithoutRef<typeof CommandPrimitive.List>
+>(({ className, ...props }, ref) => (
+    <CommandPrimitive.List
+        ref={ref}
+        className={cn("max-h-[300px] overflow-y-auto overflow-x-hidden", className)}
+        {...props}
+    />
+))
+
+CommandList.displayName = CommandPrimitive.List.displayName
+
+const CommandEmpty = React.forwardRef<
+    React.ElementRef<typeof CommandPrimitive.Empty>,
+    React.ComponentPropsWithoutRef<typeof CommandPrimitive.Empty>
+>((props, ref) => (
+    <CommandPrimitive.Empty
+        ref={ref}
+        className="py-6 text-center text-sm"
+        {...props}
+    />
+))
+
+CommandEmpty.displayName = CommandPrimitive.Empty.displayName
+
+const CommandGroup = React.forwardRef<
+    React.ElementRef<typeof CommandPrimitive.Group>,
+    React.ComponentPropsWithoutRef<typeof CommandPrimitive.Group>
+>(({ className, ...props }, ref) => (
+    <CommandPrimitive.Group
+        ref={ref}
+        className={cn(
+            "overflow-hidden p-1 text-gray-900",
+            className
+        )}
+        {...props}
+    />
+))
+
+CommandGroup.displayName = CommandPrimitive.Group.displayName
+
+const CommandItem = React.forwardRef<
+    React.ElementRef<typeof CommandPrimitive.Item>,
+    React.ComponentPropsWithoutRef<typeof CommandPrimitive.Item>
+>(({ className, ...props }, ref) => (
+    <CommandPrimitive.Item
+        ref={ref}
+        className={cn(
+            "relative flex cursor-default gap-2 select-none items-center rounded-sm px-2 py-1.5 text-sm outline-none data-[disabled=true]:pointer-events-none data-[selected=true]:bg-gray-100 data-[selected=true]:text-gray-900 data-[disabled=true]:opacity-50",
+            className
+        )}
+        {...props}
+    />
+))
+
+CommandItem.displayName = CommandPrimitive.Item.displayName
+
+export {
+    Command,
+    CommandInput,
+    CommandList,
+    CommandEmpty,
+    CommandGroup,
+    CommandItem,
+}