feat(tickets): complete governed ticket workspace

webui/src/styles/tickets.css

@@ -172,6 +172,96 @@
   color: var(--text-soft);
 }
 
+.ticket-link-list li > div,
+.ticket-participant-list li,
+.ticket-dialog-list li,
+.ticket-history-list li > div {
+  display: flex;
+  min-width: 0;
+  flex-direction: column;
+  gap: 3px;
+}
+
+.ticket-participant-list,
+.ticket-dialog-list ul,
+.ticket-history-list {
+  margin: 0;
+  padding: 0;
+  list-style: none;
+}
+
+.ticket-participant-list {
+  display: grid;
+  grid-template-columns: repeat(2, minmax(0, 1fr));
+  gap: 8px;
+}
+
+.ticket-participant-list li {
+  padding: 10px;
+  border: 1px solid var(--border);
+  border-radius: var(--radius-compact);
+  background: var(--surface-raised);
+}
+
+.ticket-participant-list small,
+.ticket-dialog-list small,
+.ticket-history-list span {
+  color: var(--text-soft);
+  font-size: 0.76rem;
+}
+
+.ticket-history-list li {
+  display: grid;
+  grid-template-columns: minmax(180px, 0.35fr) minmax(0, 1fr);
+  gap: 16px;
+  padding: 10px 2px;
+  border-bottom: 1px solid var(--border);
+}
+
+.ticket-history-list p {
+  margin: 0;
+}
+
+.ticket-dialog-add {
+  display: flex;
+  justify-content: flex-end;
+}
+
+.ticket-dialog-list {
+  max-height: 220px;
+  overflow: auto;
+  border: 1px solid var(--border);
+  border-radius: var(--radius-compact);
+}
+
+.ticket-dialog-list > p {
+  padding: 10px;
+}
+
+.ticket-dialog-list li {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 12px;
+  padding: 8px 10px;
+  border-bottom: 1px solid var(--border);
+}
+
+.ticket-destructive-actions {
+  margin-top: 32px;
+  padding-top: 18px;
+  border-top: 1px solid var(--danger, #b42318);
+}
+
+.ticket-destructive-actions h2 {
+  margin: 0 0 6px;
+  font-size: 0.98rem;
+}
+
+.ticket-destructive-actions p {
+  color: var(--text-soft);
+}
+
 .ticket-comment-form {
   display: grid;
   grid-template-columns: minmax(0, 1fr) auto auto;
@@ -223,6 +313,10 @@
   .ticket-comment-form {
     grid-template-columns: 1fr;
   }
+
+  .ticket-history-list {
+    grid-template-columns: 1fr;
+  }
 }
 
 @media (max-width: 520px) {
@@ -234,4 +328,8 @@
   .ticket-facts {
     grid-template-columns: 1fr;
   }
+
+  .ticket-participant-list {
+    grid-template-columns: 1fr;
+  }
 }