Add scoped postbox template previews

webui/src/styles/postbox.css

@@ -466,6 +466,83 @@
   font-size: 12px;
 }
 
+.postbox-relation-options {
+  min-height: 38px;
+  display: flex;
+  flex-wrap: wrap;
+  align-content: center;
+  gap: 8px 14px;
+}
+
+.postbox-relation-options label {
+  display: inline-flex;
+  align-items: center;
+  gap: 7px;
+  color: var(--text-strong);
+  font-size: 13px;
+}
+
+.postbox-relation-options input {
+  width: auto;
+}
+
+.postbox-template-preview {
+  display: grid;
+  gap: 12px;
+  border-top: var(--border-line);
+  margin-top: 18px;
+  padding-top: 16px;
+}
+
+.postbox-preview-metrics.metric-grid {
+  margin: 0;
+}
+
+.postbox-preview-targets {
+  max-height: 280px;
+  display: grid;
+  gap: 1px;
+  overflow: auto;
+  background: var(--border-color);
+  border: var(--border-line);
+}
+
+.postbox-preview-targets > div {
+  min-width: 0;
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 16px;
+  background: var(--surface);
+  padding: 10px 12px;
+}
+
+.postbox-preview-targets > div > div:first-child {
+  min-width: 0;
+  display: grid;
+  gap: 2px;
+}
+
+.postbox-preview-targets span,
+.postbox-preview-targets small {
+  color: var(--muted);
+  font-size: 12px;
+}
+
+.postbox-preview-targets code {
+  overflow: hidden;
+  color: var(--text-strong);
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.postbox-preview-status {
+  flex: 0 0 auto;
+  display: grid;
+  justify-items: end;
+  gap: 4px;
+}
+
 .postbox-form-note {
   margin: 15px 0 0;
   color: var(--muted);