removed default

Co-authored-by: Copilot <copilot@github.com>

src/app/fastcheck.service.ts

@@ -2,7 +2,7 @@
 
 export interface FastcheckData {
   fastcheck: string;
-  amount: number;
+  amount: number | null;
   code: string;
   expiration?: string;
 }

src/app/pages/create-page/create-page.ts

@@ -66,7 +66,7 @@ export class CreatePage {
   minAmount = signal<number>(30);
   maxAmount = signal<number>(200_000);
 
-  amount = signal<number>(100);
+  amount = signal<number | null>(null);
   note = signal<string>('');
   error = signal<string>('');
   loading = signal<boolean>(false);
@@ -122,11 +122,11 @@ export class CreatePage {
 
   createCheck(): void {
     const val = this.amount();
-    if (!val || val < this.minAmount()) {
+    if (val !== null && val < this.minAmount()) {
       this.error.set(`${this.t('errors.invalid_amount')} (мин. ${this.minAmount()} ₽)`);
       return;
     }
-    if (val > this.maxAmount()) {
+    if (val !== null && val > this.maxAmount()) {
       this.error.set(`${this.t('errors.invalid_amount')} (макс. ${this.maxAmount().toLocaleString('ru')} ₽)`);
       return;
     }
@@ -145,7 +145,7 @@ export class CreatePage {
         `${QR_VITANOVA_API}/qr`,
         {
           qrtype: 'QRDynamic',
-          amount: val,
+          ...(val !== null ? { amount: val } : {}),
           currency: this.currency(),
           partnerqrID,
           qrDescription: this.note().trim(),
@@ -225,7 +225,7 @@ export class CreatePage {
             this.store.setCreated({
               fastcheck: res.fastcheck,
               code: res.code,
-              amount: this.amount(),
+              amount: this.amount() ?? null,
               expiration: res.expiration
             });
           }
@@ -235,9 +235,9 @@ export class CreatePage {
       });
   }
 
-  onAmountChange(value: number): void {
-    this.amount.set(value);
-    if (value > 0) this.error.set('');
+  onAmountChange(value: number | null): void {
+    this.amount.set(value || null);
+    if (value && value > 0) this.error.set('');
   }
 
   onNoteChange(value: string): void {

src/app/pages/fastcheck-page/fastcheck-page.html

@@ -55,10 +55,10 @@
         }
       </div>
 
-      <!-- Share row — shown once amount is known -->
-      @if (fastcheckAmount() !== null && !amountLoading()) {
+      <!-- Share row — always visible, enabled once amount is known -->
       <div class="share-row">
         <button type="button" class="share-btn share-btn--email" (click)="shareByEmail()"
+                [disabled]="fastcheckAmount() === null || amountLoading()"
                 [title]="'fastcheck.share_email' | translate">
           <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor"
                stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
@@ -68,6 +68,7 @@
           {{ 'fastcheck.share_email' | translate }}
         </button>
         <button type="button" class="share-btn share-btn--tg" (click)="shareByTelegram()"
+                [disabled]="fastcheckAmount() === null || amountLoading()"
                 [title]="'fastcheck.share_tg' | translate">
           <svg width="16" height="16" viewBox="0 0 24 24" fill="currentColor">
             <path d="M9.04 15.65l-.36 4.06c.51 0 .73-.22.99-.48l2.38-2.27 4.93 3.6c.9.5 1.55.24 1.79-.83l3.24-15.18h.01c.29-1.34-.48-1.86-1.36-1.54L1.13 9.66c-1.32.5-1.3 1.23-.22 1.56l4.92 1.53L17.27 5.6c.54-.34 1.03-.15.62.19"/>
@@ -75,7 +76,6 @@
           {{ 'fastcheck.share_tg' | translate }}
         </button>
       </div>
-      }
 
       <!-- Code -->
       <div class="field">

src/app/pages/fastcheck-page/fastcheck-page.scss

@@ -40,6 +40,12 @@
     border-color: #bfdbfe;
     &:hover { background: #dbeafe; border-color: #93c5fd; }
   }
+
+  &:disabled {
+    opacity: .4;
+    cursor: not-allowed;
+    pointer-events: none;
+  }
 }
 
 .btn {