fix(letter-mgmt): make share certificate bank identity dynamic and fix broken printing

- Certificate PDFs, the preview dialog, and both share-certificate list views
  (demo + live) now pull bank name/address/reg no/seal text from the
  Institution Profile instead of a hardcoded "Nexora" identity.
- Certificate preview dialog print CSS was clipped to the dialog's on-screen
  scroll viewport (maxHeight config); switched to position:fixed + unclipped
  overlay ancestors so the full certificate prints, not just a border sliver.
- Global print stylesheet now also hides the app shell's real 2-row nav menu
  (.main-header/.kpi-ticker, not routed through <mifosx-toolbar>) and frees
  the CDK sidenav/tab-body scroll clipping, so printing any page no longer
  captures the nav chrome or gets cut off to one screen's height.

src/app/shares/shares-account-view/share-certificate-dialog/share-certificate-dialog.component.html

@@ -21,8 +21,10 @@
         </div>
 
         <div class="certificate-header">
-          <div class="bank-name">Nexora Co-operative Bank Ltd.</div>
-          <div class="bank-sub">Mumbai, Maharashtra, India</div>
+          <div class="bank-name">{{ bankName }}</div>
+          @if (bankLocation) {
+            <div class="bank-sub">{{ bankLocation }}</div>
+          }
           <div class="cert-title">SHARE CERTIFICATE</div>
           <div class="cert-subtitle">Issued under the Common Seal of the Bank</div>
         </div>
@@ -51,8 +53,8 @@
             <strong class="highlight-text">{{
               sharesAccountData.currentMarketPrice | currency: sharesAccountData.currency.code : 'symbol-narrow'
             }}</strong>
-            each, fully paid up, in <strong class="highlight-text">Nexora Co-operative Bank Ltd.</strong>, subject to
-            the memorandum, articles of association, and bye-laws of the bank.
+            each, fully paid up, in <strong class="highlight-text">{{ bankName }}</strong
+            >, subject to the memorandum, articles of association, and bye-laws of the bank.
           </p>
 
           <div class="issued-to-details">
@@ -75,7 +77,7 @@
           <tbody>
             <tr>
               <td class="lbl-col">Branch</td>
-              <td class="val-col">{{ clientData?.officeName || 'Mumbai Main Branch' }}</td>
+              <td class="val-col">{{ clientData?.officeName || 'Head Office' }}</td>
               <td class="lbl-col">Member Since</td>
               <td class="val-col">
                 {{