fix(admin-categories): key create-draft localStorage recovery on a stable id, not the ephemeral generated one

Bug: startCreate() generated a fresh id via category-${Date.now()}
every call and wrote/read the autosave draft under
admin-category-draft:<that id>. Since the id changes every time
startCreate() runs, a draft saved during one "create category" visit
can never be found by a later visit (even seconds later, same tab) -
draft recovery for new (unsaved) categories was completely dead, and
every abandoned attempt left an orphaned, never-cleaned localStorage
entry.

Fix: create-mode drafts now persist under a fixed key
(admin-category-draft:new) tracked via a new draftStorageKey field,
independent of the draft's own id. Edit-mode drafts are unaffected -
they already keyed on the real, stable category id.

Verified live via window.ng.getComponent() on
/ru/backoffice/categories/create (devBypassAdmin=true):
- Before fix: updateDraft({title}) -> localStorage key
  admin-category-draft:category-<ts1>; calling startCreate() again
  (simulating navigate-away/back) generated category-<ts2> and never
  recovered - draft.title reset to '', dirty=false, old key orphaned.
- After fix: same sequence recovers title/dirty correctly under
  admin-category-draft:new; saveDraft() clears that key as expected.

src/app/features/admin/categories/facade/admin-categories.facade.ts

@@ -6,6 +6,7 @@ import { AdminCategoriesLocalGateway } from '../services/admin-categories-local.
 import { LocalStorageService } from '../../../../core/storage/local-storage.service';
 
 const DRAFT_KEY_PREFIX = 'admin-category-draft:';
+const NEW_CATEGORY_DRAFT_KEY = `${DRAFT_KEY_PREFIX}new`;
 
 @Injectable({ providedIn: 'root' })
 export class AdminCategoriesFacade {
@@ -21,6 +22,7 @@ export class AdminCategoriesFacade {
   readonly dirty = signal(false);
   readonly slugTaken = signal(false);
   private savedSnapshot: string | null = null;
+  private draftStorageKey: string | null = null;
 
   readonly rootCategories = computed(() => this.categories().filter(category => !category.parentId));
   readonly childrenByParent = computed(() => {
@@ -69,22 +71,23 @@ export class AdminCategoriesFacade {
 
   startCreate(): void {
     this.editorMode.set('create');
-    const empty = this.formFactory.createEmpty();
-    const recovered = this.localStorage.getJSON<AdminCategory>(`${DRAFT_KEY_PREFIX}${empty.id}`);
-    this.draft.set(recovered ?? empty);
+    this.draftStorageKey = NEW_CATEGORY_DRAFT_KEY;
+    const recovered = this.localStorage.getJSON<AdminCategory>(this.draftStorageKey);
+    this.draft.set(recovered ?? this.formFactory.createEmpty());
     this.savedSnapshot = null;
     this.dirty.set(!!recovered);
   }
 
   loadForEdit(id: string): void {
     this.editorMode.set('edit');
+    this.draftStorageKey = `${DRAFT_KEY_PREFIX}${id}`;
     this.gateway.loadCategory(id).pipe(take(1)).subscribe({
       next: category => {
         if (!category) {
           this.draft.set(null);
           return;
         }
-        const recovered = this.localStorage.getJSON<AdminCategory>(`${DRAFT_KEY_PREFIX}${id}`);
+        const recovered = this.localStorage.getJSON<AdminCategory>(this.draftStorageKey!);
         this.draft.set(recovered ?? { ...category });
         this.savedSnapshot = JSON.stringify(category);
         this.dirty.set(!!recovered && JSON.stringify(recovered) !== this.savedSnapshot);
@@ -96,7 +99,9 @@ export class AdminCategoriesFacade {
     this.draft.update(current => {
       if (!current) return current;
       const updated = { ...current, ...patch, updatedAt: new Date().toISOString() };
-      this.localStorage.setJSON(`${DRAFT_KEY_PREFIX}${updated.id}`, updated);
+      if (this.draftStorageKey) {
+        this.localStorage.setJSON(this.draftStorageKey, updated);
+      }
       this.dirty.set(this.savedSnapshot !== JSON.stringify(updated));
       return updated;
     });
@@ -124,7 +129,10 @@ export class AdminCategoriesFacade {
 
     request.pipe(take(1)).subscribe({
       next: saved => {
-        this.localStorage.removeItem(`${DRAFT_KEY_PREFIX}${saved.id}`);
+        if (this.draftStorageKey) {
+          this.localStorage.removeItem(this.draftStorageKey);
+        }
+        this.draftStorageKey = `${DRAFT_KEY_PREFIX}${saved.id}`;
         this.savedSnapshot = JSON.stringify(saved);
         this.dirty.set(false);
         this.loadList();
@@ -133,9 +141,8 @@ export class AdminCategoriesFacade {
   }
 
   discardDraftRecovery(): void {
-    const draft = this.draft();
-    if (!draft) return;
-    this.localStorage.removeItem(`${DRAFT_KEY_PREFIX}${draft.id}`);
+    if (!this.draft() || !this.draftStorageKey) return;
+    this.localStorage.removeItem(this.draftStorageKey);
   }
 
   canDelete(id: string): boolean {