feat: enhance purchase orders management with delete and approve actions

- Added delete and approve functionality for purchase orders in the procurement dashboard.
- Integrated toast notifications for user feedback on actions.
- Updated the purchase orders table to include action buttons for viewing, editing, approving, and deleting orders.

refactor: improve stage editor panel UI and functionality

- Refactored StageEditorPanel to use a dialog for better user experience.
- Enhanced input handling and added custom fields management.
- Improved layout and organization of inputs and outputs sections.

fix: streamline template builder page layout

- Adjusted layout of the template builder page for better responsiveness and usability.
- Ensured the StageEditorPanel is displayed correctly when a node is selected.

feat: implement vendor code generation logic

- Created a new utility function to generate unique vendor codes based on the vendor name.
- Updated the vendor creation form to auto-generate vendor codes and display them to the user.
- Removed manual vendor code input requirement, improving user experience and reducing errors.

Frontend/erp-system/lib/vendor-code.ts

@@ -0,0 +1,18 @@
+/** First word of the name, uppercased and stripped to alphanumerics — falls back to "VN"
+ * so an empty/punctuation-only name still yields a usable base. Mirrors the warehouse
+ * code generator (app/dashboard/warehouse/page.tsx). */
+function vendorCodeBase(name: string): string {
+  const firstWord = name.trim().split(/\s+/)[0] ?? ""
+  const cleaned = firstWord.toUpperCase().replace(/[^A-Z0-9]/g, "")
+  return cleaned.slice(0, 10) || "VN"
+}
+
+/** Appends a numeric suffix until the code doesn't collide with an existing one — the
+ * backend enforces global uniqueness (409 on conflict) but has no generation of its own. */
+export function generateVendorCode(name: string, existingCodes: string[]): string {
+  const base = `VN-${vendorCodeBase(name)}`
+  if (!existingCodes.includes(base)) return base
+  let suffix = 2
+  while (existingCodes.includes(`${base}${suffix}`)) suffix += 1
+  return `${base}${suffix}`
+}