fix: nominee share & joint ownership validation across all account types

- Block 0% nominee share in all steppers (Savings, FD, RD, Current) —
  Add button disabled via isValid, addNominee() guards < 1, nominee-form
  error condition fixed for value=0
- Joint ownership: default primary share 50%, enforce min 1% on blur,
  max 100% on input with DOM clamp via $event, auto-redistribute
  co-holders proportionally when primary share changes,
  isJointOwnershipValid guards each holder >= 1
- Pending/Rejected account tabs: normalize date format to 22 May 2026
  for both array and string date values from API

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/app/shared/account-nominees-tab/account-nominees-tab.component.html

@@ -143,7 +143,9 @@
               <mat-form-field appearance="outline" class="nom-edit-field nom-edit-field--sm">
                 <mat-label>Share %</mat-label>
                 <input matInput type="number" [(ngModel)]="editShare" min="1" [max]="maxShareForEdit(i)" />
-                @if (editShare && editShare > maxShareForEdit(i)) {
+                @if (editShare !== null && editShare !== undefined && editShare < 1) {
+                  <mat-error>Share must be at least 1%</mat-error>
+                } @else if (editShare && editShare > maxShareForEdit(i)) {
                   <mat-error>Max {{ maxShareForEdit(i) }}%</mat-error>
                 }
               </mat-form-field>
@@ -152,7 +154,7 @@
                 color="primary"
                 type="button"
                 class="nom-edit-save"
-                [disabled]="!editRelId || !editShare || editShare > maxShareForEdit(i)"
+                [disabled]="!editRelId || !editShare || editShare < 1 || editShare > maxShareForEdit(i)"
                 (click)="saveEdit(nominee, i)"
               >
                 <mat-icon>check</mat-icon>
@@ -317,7 +319,9 @@
               <mat-form-field appearance="outline" class="nom-field-item nom-field-item--sm">
                 <mat-label>Share %</mat-label>
                 <input matInput type="number" [(ngModel)]="nomineeShare" min="1" [max]="maxAllowedShare" />
-                @if (nomineeShare && nomineeShare > maxAllowedShare) {
+                @if (nomineeShare !== null && nomineeShare !== undefined && nomineeShare < 1) {
+                  <mat-error>Share must be at least 1%</mat-error>
+                } @else if (nomineeShare && nomineeShare > maxAllowedShare) {
                   <mat-error>Max {{ maxAllowedShare }}%</mat-error>
                 }
               </mat-form-field>
@@ -398,6 +402,7 @@
                 [disabled]="
                   !nomineeRelationshipId ||
                   !nomineeShare ||
+                  nomineeShare < 1 ||
                   nomineeSaving ||
                   nomineeShare > maxAllowedShare ||
                   (nomineeIsMinor && !selectedGuardian) ||

src/app/shared/account-nominees-tab/account-nominees-tab.component.ts

@@ -351,7 +351,7 @@ export class AccountNomineesTabComponent implements OnInit {
   }
 
   saveNominee(): void {
-    if (!this.selectedClient || !this.nomineeRelationshipId || !this.nomineeShare) return;
+    if (!this.selectedClient || !this.nomineeRelationshipId || !this.nomineeShare || this.nomineeShare < 1) return;
     if (this.totalShare + this.nomineeShare > 100) return;
     if (this.guardianSameAsNominee) return;
 
@@ -429,7 +429,8 @@ export class AccountNomineesTabComponent implements OnInit {
   }
 
   saveEdit(nominee: any, index: number): void {
-    if (!this.editRelId || !this.editShare || this.editShare > this.maxShareForEdit(index)) return;
+    if (!this.editRelId || !this.editShare || this.editShare < 1 || this.editShare > this.maxShareForEdit(index))
+      return;
 
     const payload: any = {
       relationshipId: this.editRelId,

src/app/shared/nominee-form/nominee-form.component.html

@@ -162,8 +162,12 @@
           <mat-form-field appearance="outline" class="nom-field-item nom-field-item--sm">
             <mat-label>Share %</mat-label>
             <input matInput type="number" [(ngModel)]="percentageShare" min="1" max="100" />
-            @if (percentageShare && (percentageShare < 1 || percentageShare > 100)) {
-              <mat-error>1–100</mat-error>
+            @if (
+              percentageShare !== null &&
+              percentageShare !== undefined &&
+              (percentageShare < 1 || percentageShare > 100)
+            ) {
+              <mat-error>Share must be 1–100%</mat-error>
             }
           </mat-form-field>