feat(drafts): remove localStorage draft banner/hook; add Koncept status + filter (drafts are DB rows)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/admin/lib/documentStatus.ts

@@ -31,6 +31,7 @@ export interface StatusMeta {
  * stored value rendering consistently (warning, matching the expired row wash).
  */
 export const OFFER_STATUS: Record<string, StatusMeta> = {
+  draft: { label: "Koncept", color: "default" },
   active: { label: "Aktivní", color: "info" },
   ordered: { label: "Objednaná", color: "success" },
   invalidated: { label: "Zneplatněná", color: "error" },
@@ -62,6 +63,7 @@ export const ISSUED_ORDER_STATUS: Record<string, StatusMeta> = {
  * = warning, NOT info) — this fixes the list↔detail color drift.
  */
 export const INVOICE_STATUS: Record<string, StatusMeta> = {
+  draft: { label: "Koncept", color: "default" },
   issued: { label: "Vystavena", color: "warning" },
   overdue: { label: "Po splatnosti", color: "error" },
   paid: { label: "Zaplacena", color: "success" },