feat: dynamic denomination breakdown in deposit forms + savings menu scroller

Deposit forms (Current/Savings/FD/RD) now load cash denominations from
the Denomination Master instead of a hardcoded list:
- active + discontinued denominations fetched via /denominationmaster
- discontinued rows hidden by default behind a "Show discontinued" toggle,
  rendered faded and disabled (cannot be counted) when revealed
- rows sorted by value descending; redesigned as a Denom/Qty/Amount table
  with circular coin chips and per-row amount (faded at zero)
Also: savings account-actions menu now scrolls (max-height + grouped
sections mirror the current-account menu) and renders all action items.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/main.scss

@@ -1061,12 +1061,34 @@ mat-card {
 
 .sav-action-menu .mat-mdc-menu-content {
   padding: 0 !important;
+  overflow: hidden !important;
 }
 
 .sav-menu {
   display: flex;
   flex-direction: column;
   font-family: Inter, 'DM Sans', Roboto, sans-serif;
+  max-height: 440px;
+  overflow: hidden;
+}
+
+.sav-menu__body {
+  overflow-y: auto;
+  scrollbar-width: thin;
+  scrollbar-color: #cbd5e1 transparent;
+}
+
+.sav-menu__body::-webkit-scrollbar {
+  width: 4px;
+}
+
+.sav-menu__body::-webkit-scrollbar-track {
+  background: transparent;
+}
+
+.sav-menu__body::-webkit-scrollbar-thumb {
+  background: #cbd5e1;
+  border-radius: 4px;
 }
 
 .sav-menu__head {