fix: restore selected session highlight alongside live indicator

The PR changed `.active` class to bind on `isSessionLive()`, which
removed the visual selection state when clicking a non-live session.
Split into two classes: `.active` for selection, `.live` for streaming.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/client/src/components/hermes/chat/ChatPanel.vue

@@ -327,7 +327,7 @@ async function handleRenameConfirm() {
               v-for="s in group.sessions"
               :key="s.id"
               class="session-item"
-              :class="{ active: chatStore.isSessionLive(s.id) }"
+              :class="{ active: s.id === chatStore.activeSessionId, live: chatStore.isSessionLive(s.id) }"
               @click="handleSessionClick(s.id)"
               @contextmenu="handleContextMenu($event, s.id)"
             >
@@ -625,6 +625,10 @@ async function handleRenameConfirm() {
   &.active .session-item-title {
     color: $accent-primary;
   }
+
+  &.live .session-item-title {
+    color: $accent-primary;
+  }
 }
 
 .session-item-content {