feat(fiu): add Head Office / Branch-wise scoping; remove reconciliation nav dots

FIU: adds a branch selector (Head Office sees all/drills into one branch,
a branch-level login is locked to its own branch) scoping the CTR/STR tabs,
dashboard KPIs and header. A FIU_BRANCH_CODE_TO_CANONICAL map bridges the
module's internal FINnet branch codes to the app-wide BranchMaster codes.
Live backend-driven AML alerts/cases are unchanged (no branch field to scope by).

Shell: removes the "working nav" green-dot indicator from the Reconciliation
mega-menu's 17 report links per request.

src/app/fiu/fiu.component.html

@@ -14,12 +14,25 @@
       <div>
         <h2 class="fiu-head-t">Financial Intelligence Unit – India (FIU-IND)</h2>
         <div class="fiu-head-s">
-          {{ bank.name }} &middot; {{ bank.branch }} &middot; Reporting Month <strong>{{ bank.reportingMonth }}</strong>
+          {{ bank.name }} &middot; {{ scopeName }} &middot; Reporting Month <strong>{{ bank.reportingMonth }}</strong>
           &middot; PMLA 2002 / FINnet 2.0
         </div>
       </div>
     </div>
     <div class="fiu-head-meta">
+      <div>
+        <span class="fiu-meta-l">Branch</span>
+        @if (isHeadOffice) {
+          <select class="fiu-inp" [ngModel]="branchFilter" (ngModelChange)="setBranch($event)">
+            <option value="">All Branches</option>
+            @for (b of branches; track b.code) {
+              <option [value]="b.code">{{ b.name }}</option>
+            }
+          </select>
+        } @else {
+          <span class="fiu-meta-v">{{ scopeName }}</span>
+        }
+      </div>
       <div>
         <span class="fiu-meta-l">Principal Officer</span><span class="fiu-meta-v">{{ bank.principalOfficer }}</span>
       </div>
@@ -339,7 +352,9 @@
                 <td>
                   {{ t.instrumentType }} <span class="muted">{{ t.instrumentId }}</span>
                 </td>
-                <td class="mono">{{ t.branchCode }}</td>
+                <td class="mono">
+                  {{ t.branchCode }} <span class="muted">{{ branchNameFor(t.branchCode) }}</span>
+                </td>
                 <td class="ta-c">
                   <span class="rel-pill" [class.non-cust]="t.relationshipFlag === 'Non-Customer'">{{
                     t.relationshipFlag
@@ -779,6 +794,9 @@
                 <div>
                   <label>Instrument</label><span>{{ s.instrumentType }} {{ s.instrumentId }}</span>
                 </div>
+                <div>
+                  <label>Branch</label><span class="mono">{{ s.branchCode }} {{ branchNameFor(s.branchCode) }}</span>
+                </div>
               </div>
               <div class="str-narrative">
                 <label>Narrative</label>