feat(shares): real-profit driven dividend UI, Dividend Dashboard, and member claim workflow

Frontend counterpart to the backend dividend rework:
- Create Dividend screen auto-computes the amount from real bank profit x officer
  percentage, blocks overlapping declaration periods, and adds a Total Dividend Paid
  summary card.
- View Dividend page modernized and reusable as an embedded popup from the new
  cross-product "Dividend Requests" approval-center tab.
- New consolidated Dividend Dashboard: summary stats, every declaration and its
  status, locked-dividend-vs-overdue-EMI matching with a proactive apply-to-loan
  action, full 3-year lock history, and a maker-checker claim panel letting a clerk
  split a member's unclaimed dividend across an overdue loan, savings credit, or
  cash for a manager to approve.
- Menu/routing consolidated under Share > Dividend Management; removed the
  now-unreachable Failed Dividend Payouts page and its home-dashboard alert once the
  backend stopped needing a retry path for stuck payouts.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/app/core/shell/shell.component.html

@@ -1235,6 +1235,13 @@
             <fa-icon icon="id-card" class="menu-item-icon"></fa-icon> Share Member Details
           </button>
         </div>
+        <!-- Dividend Management -->
+        <div class="deposit-menu-group">
+          <div class="deposit-group-title">Dividend Management</div>
+          <button mat-menu-item routerLink="/clerk/dividend-dashboard" tabindex="0">
+            <fa-icon icon="hand-holding-usd" class="menu-item-icon"></fa-icon> Dividend Dashboard
+          </button>
+        </div>
       </div>
     </mat-menu>