feat: add governed postbox delivery and report hardening

webui/src/styles/campaign-workspace.css

@@ -947,6 +947,83 @@
   overflow: auto;
 }
 
+.campaign-postbox-delivery-settings {
+  display: grid;
+  grid-template-columns: repeat(3, minmax(180px, 1fr));
+  gap: 12px;
+  align-items: end;
+  margin-top: 16px;
+}
+
+.campaign-postbox-target-modal {
+  width: min(1040px, calc(100vw - 32px));
+}
+
+.campaign-postbox-target-body {
+  max-height: min(76vh, 820px);
+  overflow: auto;
+}
+
+.campaign-postbox-target-toolbar,
+.campaign-postbox-target-row-heading,
+.campaign-recipient-delivery-cell {
+  display: flex;
+  align-items: center;
+  gap: 10px;
+}
+
+.campaign-postbox-target-toolbar {
+  justify-content: space-between;
+  margin-bottom: 12px;
+}
+
+.campaign-postbox-target-list {
+  display: grid;
+  gap: 10px;
+}
+
+.campaign-postbox-target-row {
+  display: grid;
+  gap: 10px;
+  border: var(--border-line);
+  border-radius: var(--radius-sm);
+  background: var(--panel);
+  padding: 10px;
+}
+
+.campaign-postbox-target-row-heading {
+  justify-content: space-between;
+}
+
+.campaign-postbox-target-grid {
+  grid-template-columns: repeat(3, minmax(180px, 1fr));
+}
+
+.campaign-recipient-delivery-cell {
+  min-width: 0;
+}
+
+.campaign-recipient-delivery-cell select {
+  min-width: 0;
+  flex: 1 1 170px;
+}
+
+.campaign-recipient-delivery-cell .button {
+  flex: 0 0 auto;
+}
+
+@media (max-width: 900px) {
+  .campaign-postbox-delivery-settings,
+  .campaign-postbox-target-grid {
+    grid-template-columns: 1fr;
+  }
+
+  .campaign-recipient-delivery-cell {
+    align-items: stretch;
+    flex-direction: column;
+  }
+}
+
 .recipient-address-editor {
   display: grid;
   gap: 12px;