feat(desktop): User Message Badges on Hover (#7835)

packages/ui/src/components/session-turn.css

@@ -30,6 +30,35 @@
     overflow-anchor: none;
   }
 
+  [data-slot="session-turn-user-badges"] {
+    display: flex;
+    flex-shrink: 0;
+    align-items: center;
+    gap: 6px;
+    opacity: 0;
+    transition: opacity 0.15s ease;
+    pointer-events: none;
+
+    &[data-visible="true"] {
+      opacity: 1;
+      pointer-events: auto;
+    }
+  }
+
+  [data-slot="session-turn-badge"] {
+    display: inline-flex;
+    align-items: center;
+    padding: 2px 6px;
+    border-radius: 4px;
+    font-family: var(--font-family-mono);
+    font-size: var(--font-size-x-small);
+    font-weight: var(--font-weight-medium);
+    line-height: var(--line-height-normal);
+    white-space: nowrap;
+    color: var(--text-base);
+    background: var(--surface-raised-base);
+  }
+
   [data-slot="session-turn-sticky-title"] {
     width: 100%;
     position: sticky;
@@ -52,7 +81,8 @@
   [data-slot="session-turn-message-header"] {
     display: flex;
     align-items: center;
-    gap: 8px;
+    justify-content: space-between;
+    gap: 12px;
     align-self: stretch;
     height: 32px;
   }

packages/ui/src/components/session-turn.tsx

@@ -5,6 +5,7 @@ import {
   type PermissionRequest,
   TextPart,
   ToolPart,
+  UserMessage,
 } from "@opencode-ai/sdk/v2/client"
 import { useData } from "../context"
 import { useDiffComponent } from "../context/diff"
@@ -373,6 +374,7 @@ export function SessionTurn(
     diffLimit: diffInit,
     status: rawStatus(),
     duration: duration(),
+    userMessageHovered: false,
   })
 
   createEffect(
@@ -473,6 +475,8 @@ export function SessionTurn(
                 data-slot="session-turn-message-container"
                 class={props.classes?.container}
                 style={{ "--sticky-header-height": `${store.stickyHeaderHeight}px` }}
+                onMouseEnter={() => setStore("userMessageHovered", true)}
+                onMouseLeave={() => setStore("userMessageHovered", false)}
               >
                 <Switch>
                   <Match when={isShellMode()}>
@@ -492,6 +496,15 @@ export function SessionTurn(
                             </Match>
                           </Switch>
                         </div>
+                        <div data-slot="session-turn-user-badges" data-visible={store.userMessageHovered}>
+                          <Show when={(msg() as UserMessage).agent}>
+                            <span data-slot="session-turn-badge">{(msg() as UserMessage).agent}</span>
+                          </Show>
+                          <Show when={(msg() as UserMessage).model?.modelID}>
+                            <span data-slot="session-turn-badge">{(msg() as UserMessage).model?.modelID}</span>
+                          </Show>
+                          <span data-slot="session-turn-badge">{(msg() as UserMessage).variant || "default"}</span>
+                        </div>
                       </div>
                     </div>
                     {/* User Message */}