feat(grn): add update functionality for draft GRNs and support document-level discounts

- Implemented Update method in GrnsController to allow editing of draft GRNs.
- Enhanced CreateGrnRequest to include an optional totalDiscount property.
- Updated GrnService to handle GRN updates, including validation and line item processing.
- Modified NewGrnPage to support editing existing GRNs and applying document-level discounts.
- Improved UI in NewItemPage and GrnDetailPage for better user experience.
- Added search functionality to Select component for improved item selection.

Frontend/erp-system/components/ui/select.tsx

@@ -4,7 +4,7 @@ import * as React from "react"
 import { Select as SelectPrimitive } from "@base-ui/react/select"
 
 import { cn } from "@/lib/utils"
-import { ChevronDownIcon, CheckIcon, ChevronUpIcon } from "lucide-react"
+import { ChevronDownIcon, CheckIcon, ChevronUpIcon, SearchIcon } from "lucide-react"
 
 // Base UI's `Select.Value` renders the raw selected value (e.g. an id) unless the Root is
 // given an `items` map to resolve the label from — the popup items are unmounted when closed,
@@ -61,6 +61,50 @@ function SelectValue({ className, ...props }: SelectPrimitive.Value.Props) {
   )
 }
 
+/** Flattens a node's rendered text so a SelectItem can be matched against a search query. */
+function nodeToText(node: React.ReactNode): string {
+  if (node === null || node === undefined || typeof node === "boolean") return ""
+  if (typeof node === "string" || typeof node === "number") return String(node)
+  if (Array.isArray(node)) return node.map(nodeToText).join(" ")
+  if (React.isValidElement(node)) {
+    return nodeToText((node.props as { children?: React.ReactNode }).children)
+  }
+  return ""
+}
+
+/** Walks the popup's children, dropping any SelectItem whose text doesn't match the query. */
+function filterSelectChildren(children: React.ReactNode, query: string): React.ReactNode {
+  const q = query.trim().toLowerCase()
+  if (!q) return children
+
+  return React.Children.map(children, (child) => {
+    if (!React.isValidElement(child)) return child
+    if (child.type === SelectItem) {
+      const text = nodeToText((child.props as { children?: React.ReactNode }).children).toLowerCase()
+      return text.includes(q) ? child : null
+    }
+    const nested = (child.props as { children?: React.ReactNode }).children
+    if (nested !== undefined) {
+      return React.cloneElement(child, undefined, filterSelectChildren(nested, query))
+    }
+    return child
+  })
+}
+
+function countSelectItems(node: React.ReactNode): number {
+  let count = 0
+  React.Children.forEach(node, (child) => {
+    if (!React.isValidElement(child)) return
+    if (child.type === SelectItem) {
+      count += 1
+      return
+    }
+    const nested = (child.props as { children?: React.ReactNode }).children
+    if (nested !== undefined) count += countSelectItems(nested)
+  })
+  return count
+}
+
 function SelectTrigger({
   className,
   size = "default",
@@ -96,13 +140,27 @@ function SelectContent({
   sideOffset = 4,
   align = "center",
   alignOffset = 0,
-  alignItemWithTrigger = true,
+  // Aligning the popup to the selected item lets it float above the trigger (and above the
+  // search box). A plain dropdown that always opens fully below the trigger is what the
+  // search box needs to stay pinned to the top, so this defaults to off now.
+  alignItemWithTrigger = false,
   ...props
 }: SelectPrimitive.Popup.Props &
   Pick<
     SelectPrimitive.Positioner.Props,
     "align" | "alignOffset" | "side" | "sideOffset" | "alignItemWithTrigger"
   >) {
+  const [query, setQuery] = React.useState("")
+  const searchRef = React.useRef<HTMLInputElement>(null)
+
+  // The popup remounts each time it opens, so this only ever fires once per open.
+  React.useEffect(() => {
+    searchRef.current?.focus()
+  }, [])
+
+  const filteredChildren = React.useMemo(() => filterSelectChildren(children, query), [children, query])
+  const noResults = query.trim().length > 0 && countSelectItems(filteredChildren) === 0
+
   return (
     <SelectPrimitive.Portal>
       <SelectPrimitive.Positioner
@@ -119,8 +177,27 @@ function SelectContent({
           className={cn("relative isolate z-50 max-h-(--available-height) w-(--anchor-width) min-w-36 origin-(--transform-origin) overflow-x-hidden overflow-y-auto rounded-lg bg-popover text-popover-foreground shadow-md ring-1 ring-foreground/10 duration-100 data-[align-trigger=true]:animate-none data-[side=bottom]:slide-in-from-top-2 data-[side=inline-end]:slide-in-from-left-2 data-[side=inline-start]:slide-in-from-right-2 data-[side=left]:slide-in-from-right-2 data-[side=right]:slide-in-from-left-2 data-[side=top]:slide-in-from-bottom-2 data-open:animate-in data-open:fade-in-0 data-open:zoom-in-95 data-closed:animate-out data-closed:fade-out-0 data-closed:zoom-out-95", className )}
           {...props}
         >
+          <div data-slot="select-search" className="sticky top-0 z-10 bg-popover p-1.5 pb-1">
+            <div className="relative">
+              <SearchIcon className="pointer-events-none absolute top-1/2 left-2 size-3.5 -translate-y-1/2 text-muted-foreground" />
+              <input
+                ref={searchRef}
+                type="text"
+                value={query}
+                onChange={(e) => setQuery(e.target.value)}
+                onKeyDown={(e) => {
+                  if (e.key !== "Escape") e.stopPropagation()
+                }}
+                placeholder="Search…"
+                className="h-8 w-full rounded-md border border-input bg-transparent pr-2 pl-7 text-sm outline-none focus-visible:border-ring focus-visible:ring-3 focus-visible:ring-ring/50"
+              />
+            </div>
+          </div>
           <SelectScrollUpButton />
-          <SelectPrimitive.List>{children}</SelectPrimitive.List>
+          <SelectPrimitive.List>{filteredChildren}</SelectPrimitive.List>
+          {noResults && (
+            <div className="px-2 py-6 text-center text-sm text-muted-foreground">No results found.</div>
+          )}
           <SelectScrollDownButton />
         </SelectPrimitive.Popup>
       </SelectPrimitive.Positioner>