feat(FN-3899): add chat rooms with send routing and delete-room UI

This merge delivers chat rooms with room send routing and delete-room UI in the dashboard (FN-3899), including fixes for bundled plugin view imports and a release changeset. Supporting changes include a merger improvement that tightens scope-warning diff base when baseBranch is missing, companies.sh

Fusion-Task-Id: FN-3899

packages/dashboard/app/components/ChatView.css

@@ -109,15 +109,16 @@
 .chat-room-item {
   width: 100%;
   display: flex;
-  flex-direction: column;
-  align-items: flex-start;
-  gap: var(--space-xs);
+  align-items: center;
+  justify-content: space-between;
+  gap: var(--space-sm);
   border: none;
   border-radius: var(--radius-md);
   background: transparent;
   color: var(--text);
   padding: var(--space-sm) var(--space-md);
   text-align: left;
+  cursor: pointer;
 }
 
 .chat-room-item:hover {
@@ -133,6 +134,13 @@
   background: color-mix(in srgb, var(--todo) 12%, transparent);
 }
 
+.chat-room-item-details {
+  min-width: 0;
+  display: flex;
+  flex-direction: column;
+  gap: var(--space-xs);
+}
+
 .chat-room-item-name {
   font-weight: 500;
 }
@@ -142,6 +150,15 @@
   font-size: var(--space-sm);
 }
 
+.chat-room-item-delete {
+  color: var(--text-muted);
+}
+
+.chat-room-item-delete:hover,
+.chat-room-item-delete:focus-visible {
+  color: var(--color-error);
+}
+
 .chat-room-thread-header {
   display: flex;
   align-items: center;
@@ -1402,6 +1419,14 @@
     min-width: 36px;
   }
 
+  .chat-room-item {
+    padding: var(--space-sm);
+  }
+
+  .chat-room-item-delete {
+    flex-shrink: 0;
+  }
+
   .chat-room-thread-members {
     max-width: 50%;
   }