fix: restore content silently dropped from the dev merge (KYC exception, TDS reports, Form 121)

The demo-backup merge's git 3-way auto-resolve dropped several hunks
without flagging conflicts, wherever demo had independently touched
adjacent lines: the KYC Exception feature (client-kyc-step, kyc-tab,
create-client, clients.service — checkbox, derivation logic, banners,
contact-log endpoints), TDS report routes/menu links (reports-routing,
shell), the Form 121 client tab (clients-routing, clients-view), the
kyc-management exceptions dashboard, and the Form 121/15G-H register's
real-data view integration. Restored by diffing demo-backup against
dev per file and re-applying each genuine gap while preserving
demo-backup's own independent work (Approval Center tab style, Loan
Origination/Investment menus, form-97-98/risk-review report routes).

src/app/letter-mgmt/certificates/certificates.shared.scss

@@ -505,3 +505,72 @@
   font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
   color: var(--cert-g900);
 }
+
+/* Form 121 register — eligibility warnings and the quarter-wise drill-down */
+
+/* A row the branch needs to look at: an ineligible declaration, or the quarter
+   in which the 194A threshold was crossed. */
+.cert-row--warn > td {
+  background: color-mix(in srgb, var(--cert-amber) 7%, transparent);
+}
+
+.cert-row--detail > td {
+  background: var(--cert-g50);
+  padding: 16px;
+}
+
+.cert-note {
+  display: flex;
+  gap: 10px;
+  align-items: flex-start;
+  margin-bottom: 12px;
+  padding: 10px 12px;
+  border-radius: 8px;
+  background: color-mix(in srgb, var(--cert-blue) 6%, transparent);
+  border-left: 3px solid var(--cert-blue);
+  font-size: 12px;
+  color: var(--cert-g900);
+  line-height: 1.5;
+
+  fa-icon {
+    color: var(--cert-blue);
+    flex-shrink: 0;
+    margin-top: 1px;
+  }
+
+  ul {
+    margin: 6px 0 0;
+    padding-left: 18px;
+  }
+
+  li + li {
+    margin-top: 4px;
+  }
+
+  &--warn {
+    background: color-mix(in srgb, var(--cert-amber) 8%, transparent);
+    border-left-color: var(--cert-amber);
+
+    fa-icon {
+      color: var(--cert-amber);
+    }
+  }
+}
+
+/* The quarter table nested inside an expanded row. */
+.cert-table--inner {
+  background: #fff;
+  border: 1px solid var(--cert-g200);
+  border-radius: 8px;
+  overflow: hidden;
+  margin-bottom: 10px;
+
+  th {
+    background: #fff;
+    border-bottom: 1px solid var(--cert-g200);
+  }
+
+  .cert-pill {
+    margin-left: 6px;
+  }
+}